{"id":6202,"date":"2024-08-01T22:46:16","date_gmt":"2024-08-01T14:46:16","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=6202"},"modified":"2024-08-01T22:46:16","modified_gmt":"2024-08-01T14:46:16","slug":"%e4%ba%ac%e4%b8%9c%ef%bc%9amysql-%e4%b8%ad%e7%9a%84-distinct-%e5%92%8c-group-by-%e5%93%aa%e4%b8%aa%e6%95%88%e7%8e%87%e6%9b%b4%e9%ab%98%ef%bc%9f%e5%a4%aa%e5%88%81%e9%92%bb%ef%bc%81","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/%e9%9d%a2%e8%af%95\/%e4%ba%ac%e4%b8%9c%ef%bc%9amysql-%e4%b8%ad%e7%9a%84-distinct-%e5%92%8c-group-by-%e5%93%aa%e4%b8%aa%e6%95%88%e7%8e%87%e6%9b%b4%e9%ab%98%ef%bc%9f%e5%a4%aa%e5%88%81%e9%92%bb%ef%bc%81\/","title":{"rendered":"\u4eac\u4e1c\uff1aMySQL \u4e2d\u7684 distinct \u548c group by \u54ea\u4e2a\u6548\u7387\u66f4\u9ad8\uff1f\u592a\u5201\u94bb\uff01"},"content":{"rendered":"<div class='wxsyncmain'>\n<p style=\"text-align: right;\" data-mpa-powered-by=\"yiban.io\"><img decoding=\"async\" class=\"rich_pages wxw-img lazyload\" data-galleryid=\"\" data-imgfileid=\"100058852\" data-ratio=\"0.4255555555555556\" data-s=\"300,640\"  data-type=\"jpeg\" data-w=\"900\" style=\";\" data-src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801224036124.jpeg\" src=\"https:\/\/s.nmxc.ltd\/sakurairo_vision\/@2.6\/load_svg\/inload.svg\" onerror=\"imgError(this)\"  \/><noscript><img decoding=\"async\" class=\"rich_pages wxw-img\" data-galleryid=\"\" data-imgfileid=\"100058852\" data-ratio=\"0.4255555555555556\" data-s=\"300,640\"  data-type=\"jpeg\" data-w=\"900\" style=\";\" src=\"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801224036124.jpeg\"  \/><\/noscript><span style=\"color: rgb(136, 136, 136);font-size: 13px;letter-spacing: 0.02em;text-indent: 0em;font-family: Optima-Regular, Optima, PingFangSC-light, PingFangTC-light, &quot;PingFang SC&quot;, Cambria, Cochin, Georgia, Times, &quot;Times New Roman&quot;, serif;word-spacing: 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PingFangSC-light, PingFangTC-light, &quot;PingFang SC&quot;, Cambria, Cochin, Georgia, Times, &quot;Times New Roman&quot;, serif;font-size: 16px;color: rgb(0, 0, 0);line-height: 1.5em;word-spacing: 0em;letter-spacing: 0em;word-break: break-word;text-align: left;\">\n<ul data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 8px;margin-bottom: 8px;padding-left: 25px;\" class=\"list-paddingleft-1\">\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">\u7ed3\u8bba<\/section>\n<\/li>\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">distinct\u7684\u4f7f\u7528<\/section>\n<\/li>\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">group by\u7684\u4f7f\u7528<\/section>\n<\/li>\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">distinct\u548cgroup by\u539f\u7406<\/section>\n<\/li>\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">\u63a8\u8350group by\u7684\u539f\u56e0<\/section>\n<\/li>\n<\/ul>\n<hr data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 10px;margin-bottom: 10px;border-style: none;border-bottom-width: 3px;border-left-width: 3px;border-right-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 0px;background: linear-gradient(90deg, rgba(93, 186, 133, 0) 0%, rgba(93, 186, 133, 0.75) 50%, rgba(93, 186, 133, 0) 100%) 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(255, 255, 255, 0);width: auto;height: 2px;\"  \/>\n<h2 data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 30px;margin-bottom: 15px;background-attachment: scroll;background-clip: border-box;background-image: url('https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801224006492.png');background-origin: padding-box;background-position: 50% 50%;background-repeat: no-repeat;background-size: 63px;width: auto;height: auto;align-items: unset;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;box-shadow: none;display: flex;flex-direction: unset;float: unset;justify-content: center;line-height: 1.5em;overflow: unset;text-shadow: none;transform: none;-webkit-box-reflect: unset;\"><span style=\"display: none;\"><\/span><span style=\"font-size: 18px;color: rgb(72, 179, 120);line-height: 2.4em;letter-spacing: 0em;margin-top: 38px;margin-bottom: 10px;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;align-items: unset;background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;box-shadow: none;display: inline-block;font-weight: bold;flex-direction: unset;float: unset;height: 38px;justify-content: unset;overflow: unset;text-align: center;text-indent: 0em;text-shadow: none;transform: none;width: auto;-webkit-box-reflect: unset;\"><strong style=\"align-items: unset;background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;box-shadow: none;color: rgb(0, 0, 0);display: inline-block;font-size: 22px;flex-direction: unset;float: unset;height: auto;justify-content: unset;letter-spacing: 0px;line-height: 1.5em;overflow: unset;text-align: left;text-indent: 0em;text-shadow: none;transform: none;width: auto;-webkit-box-reflect: unset;\">\u7ed3\u8bba<\/strong><\/span><span style=\"display: none;\"><\/span><\/h2>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: 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5px;margin-bottom: 5px;color: rgb(63, 63, 63);font-size: 16px;line-height: 1.8em;letter-spacing: 0.02em;\">\u5728\u8bed\u4e49\u76f8\u540c\uff0c\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff1a<code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u548cdistinct\u90fd\u80fd\u4f7f\u7528\u7d22\u5f15\uff0c\u6548\u7387\u76f8\u540c\u3002<\/section>\n<\/li>\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);font-size: 16px;line-height: 1.8em;letter-spacing: 0.02em;\">\u5728\u8bed\u4e49\u76f8\u540c\uff0c\u65e0\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff1adistinct\u6548\u7387\u9ad8\u4e8e<code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u3002\u539f\u56e0\u662fdistinct \u548c <code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u90fd\u4f1a\u8fdb\u884c\u5206\u7ec4\u64cd\u4f5c\uff0c\u4f46<code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u53ef\u80fd\u4f1a\u8fdb\u884c\u6392\u5e8f\uff0c\u89e6\u53d1filesort\uff0c\u5bfc\u81f4sql\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u3002<\/section>\n<\/li>\n<\/ul>\n<\/blockquote>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u57fa\u4e8e\u8fd9\u4e2a\u7ed3\u8bba\uff0c\u4f60\u53ef\u80fd\u4f1a\u95ee\uff1a<\/p>\n<ul data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 8px;margin-bottom: 8px;padding-left: 25px;\" class=\"list-paddingleft-1\">\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">\u4e3a\u4ec0\u4e48\u5728\u8bed\u4e49\u76f8\u540c\uff0c\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c<code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u548cdistinct\u6548\u7387\u76f8\u540c\uff1f<\/section>\n<\/li>\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">\u5728\u4ec0\u4e48\u60c5\u51b5\u4e0b\uff0c<code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u4f1a\u8fdb\u884c\u6392\u5e8f\u64cd\u4f5c\uff1f<\/section>\n<\/li>\n<\/ul>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u5e26\u7740\u8fd9\u4e24\u4e2a\u95ee\u9898\u627e\u7b54\u6848\u3002\u63a5\u4e0b\u6765\uff0c\u6211\u4eec\u5148\u6765\u770b\u4e00\u4e0bdistinct\u548c<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u7684\u57fa\u7840\u4f7f\u7528\u3002<\/p>\n<h2 data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 30px;margin-bottom: 15px;background-attachment: scroll;background-clip: border-box;background-image: url('https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801224006492.png');background-origin: padding-box;background-position: 50% 50%;background-repeat: no-repeat;background-size: 63px;width: auto;height: auto;align-items: unset;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;box-shadow: none;display: flex;flex-direction: unset;float: unset;justify-content: center;line-height: 1.5em;overflow: unset;text-shadow: none;transform: none;-webkit-box-reflect: unset;\"><span style=\"display: none;\"><\/span><span style=\"font-size: 18px;color: rgb(72, 179, 120);line-height: 2.4em;letter-spacing: 0em;margin-top: 38px;margin-bottom: 10px;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;align-items: unset;background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;box-shadow: none;display: inline-block;font-weight: bold;flex-direction: unset;float: unset;height: 38px;justify-content: unset;overflow: unset;text-align: center;text-indent: 0em;text-shadow: none;transform: none;width: auto;-webkit-box-reflect: unset;\"><strong style=\"align-items: unset;background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;box-shadow: none;color: rgb(0, 0, 0);display: inline-block;font-size: 22px;flex-direction: unset;float: unset;height: auto;justify-content: unset;letter-spacing: 0px;line-height: 1.5em;overflow: unset;text-align: left;text-indent: 0em;text-shadow: none;transform: none;width: auto;-webkit-box-reflect: unset;\">distinct\u7684\u4f7f\u7528<\/strong><\/span><span style=\"display: none;\"><\/span><\/h2>\n<h4 data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 30px;margin-bottom: 15px;\"><span style=\"display: none;\"><\/span><span style=\"font-size: 18px;line-height: 1.5em;letter-spacing: 0em;font-weight: bold;display: block;\">distinct\u7528\u6cd5<\/span><span style=\"display: none;\"><\/span><\/h4>\n<pre data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"border-radius: 5px;box-shadow: rgba(0, 0, 0, 0.55) 0px 2px 10px;margin-top: 10px;margin-bottom: 10px;\"><span style=\"display: block;background: url(&quot;https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801224046639.jpeg&quot;) 10px 10px \/ 40px no-repeat rgb(40, 44, 52);height: 30px;width: 100%;margin-bottom: -7px;border-radius: 5px;\"><\/span><code style=\"overflow-x: auto;padding: 16px;color: #abb2bf;padding-top: 15px;background: #282c34;border-radius: 5px;display: -webkit-box;font-family: Consolas, Monaco, Menlo, monospace;font-size: 12px;\">mysql&gt;explainselectint6_bigger_randomfromtest_distinct_groupbyGROUPBYint6_bigger_random;+----+-------------+-----------------------+------------+------+---------------+------+---------+------+-------+----------+---------------------------------+|id|select_type|table|partitions|<span style=\"color: #e6c07b;line-height: 26px;\">type<\/span>|possible_keys|key|key_len|ref|rows|filtered|Extra|+----+-------------+-----------------------+------------+------+---------------+------+---------+------+-------+----------+---------------------------------+|1|SIMPLE|test_distinct_groupby|NULL|ALL|NULL|NULL|NULL|NULL|97402|100.00|Usingtemporary;Usingfilesort|+----+-------------+-----------------------+------------+------+---------------+------+---------+------+-------+----------+---------------------------------+1row<span style=\"color: #c678dd;line-height: 26px;\">in<\/span><span style=\"color: #e6c07b;line-height: 26px;\">set<\/span>(0.04sec)<\/code><\/pre>\n<h4 data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 30px;margin-bottom: 15px;\"><span style=\"display: none;\"><\/span><span style=\"font-size: 18px;line-height: 1.5em;letter-spacing: 0em;font-weight: bold;display: block;\">\u9690\u5f0f\u6392\u5e8f<\/span><span style=\"display: none;\"><\/span><\/h4>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\"><strong style=\"color: rgb(74, 74, 74);background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;width: auto;height: auto;border-style: none;border-width: 3px;border-color: rgba(0, 0, 0, 0.4);border-radius: 0px;\">\u5bf9\u4e8e\u9690\u5f0f\u6392\u5e8f\uff0c\u6211\u4eec\u53ef\u4ee5\u53c2\u8003Mysql\u5b98\u65b9\u7684\u89e3\u91ca\uff1a<\/strong><\/p>\n<ul data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 8px;margin-bottom: 8px;padding-left: 25px;\" class=\"list-paddingleft-1\">\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">https:\/\/dev.mysql.com\/doc\/refman\/5.7\/en\/order-by-optimization.html<\/section>\n<\/li>\n<\/ul>\n<blockquote data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 20px;margin-bottom: 20px;padding: 10px 10px 10px 20px;border-top: 3px none rgba(0, 0, 0, 0.4);border-bottom: 3px none rgba(0, 0, 0, 0.4);border-right: 3px none rgba(0, 0, 0, 0.4);border-left-color: rgb(53, 179, 120);border-radius: 0px;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgb(251, 249, 253);width: auto;height: auto;box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;overflow: auto;\"><p><span style=\"display: none;color: rgb(0, 0, 0);font-size: 16px;line-height: 1.5em;letter-spacing: 0em;\"><\/span><\/p>\n<p style=\"text-indent: 0em;padding-top: 16px;padding-bottom: 8px;color: rgb(63, 63, 63);font-size: 16px;line-height: 1.8em;letter-spacing: 0.02em;\">GROUP BY implicitly sorts by default (that is, in the absence of ASC or DESC designators for GROUP BY columns). However, relying on implicit GROUP BY sorting (that is, sorting in the absence of ASC or DESC designators) or explicit sorting for GROUP BY (that is, by using explicit ASC or DESC designators for GROUP BY columns) is deprecated. To produce a given sort order, provide an ORDER BY clause.<\/p>\n<\/blockquote>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u5927\u81f4\u89e3\u91ca\u4e00\u4e0b\uff1a<\/p>\n<blockquote data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 20px;margin-bottom: 20px;padding: 10px 10px 10px 20px;border-top: 3px none rgba(0, 0, 0, 0.4);border-bottom: 3px none rgba(0, 0, 0, 0.4);border-right: 3px none rgba(0, 0, 0, 0.4);border-left-color: rgb(53, 179, 120);border-radius: 0px;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgb(251, 249, 253);width: auto;height: auto;box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;overflow: auto;\"><p><span style=\"display: none;color: rgb(0, 0, 0);font-size: 16px;line-height: 1.5em;letter-spacing: 0em;\"><\/span><\/p>\n<p style=\"text-indent: 0em;padding-top: 16px;padding-bottom: 8px;color: rgb(63, 63, 63);font-size: 16px;line-height: 1.8em;letter-spacing: 0.02em;\">GROUP BY \u9ed8\u8ba4\u9690\u5f0f\u6392\u5e8f\uff08\u6307\u5728 GROUP BY \u5217\u6ca1\u6709 ASC \u6216 DESC \u6307\u793a\u7b26\u7684\u60c5\u51b5\u4e0b\u4e5f\u4f1a\u8fdb\u884c\u6392\u5e8f\uff09\u3002\u7136\u800c\uff0cGROUP BY\u8fdb\u884c\u663e\u5f0f\u6216\u9690\u5f0f\u6392\u5e8f\u5df2\u7ecf\u8fc7\u65f6\uff08deprecated\uff09\u4e86\uff0c\u8981\u751f\u6210\u7ed9\u5b9a\u7684\u6392\u5e8f\u987a\u5e8f\uff0c\u8bf7\u63d0\u4f9b ORDER BY \u5b50\u53e5\u3002<\/p>\n<\/blockquote>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u6240\u4ee5\uff0c\u5728Mysql8.0\u4e4b\u524d,<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">Group by<\/code>\u4f1a\u9ed8\u8ba4\u6839\u636e\u4f5c\u7528\u5b57\u6bb5\uff08<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">Group by<\/code>\u7684\u540e\u63a5\u5b57\u6bb5\uff09\u5bf9\u7ed3\u679c\u8fdb\u884c\u6392\u5e8f\u3002\u5728\u80fd\u5229\u7528\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">Group by<\/code>\u4e0d\u9700\u8981\u989d\u5916\u8fdb\u884c\u6392\u5e8f\u64cd\u4f5c\uff1b\u4f46\u5f53\u65e0\u6cd5\u5229\u7528\u7d22\u5f15\u6392\u5e8f\u65f6\uff0cMysql\u4f18\u5316\u5668\u5c31\u4e0d\u5f97\u4e0d\u9009\u62e9\u901a\u8fc7\u4f7f\u7528\u4e34\u65f6\u8868\u7136\u540e\u518d\u6392\u5e8f\u7684\u65b9\u5f0f\u6765\u5b9e\u73b0<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">GROUP BY<\/code>\u4e86\u3002<\/p>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u4e14\u5f53\u7ed3\u679c\u96c6\u7684\u5927\u5c0f\u8d85\u51fa\u7cfb\u7edf\u8bbe\u7f6e\u4e34\u65f6\u8868\u5927\u5c0f\u65f6\uff0cMysql\u4f1a\u5c06\u4e34\u65f6\u8868\u6570\u636ecopy\u5230\u78c1\u76d8\u4e0a\u9762\u518d\u8fdb\u884c\u64cd\u4f5c\uff0c\u8bed\u53e5\u7684\u6267\u884c\u6548\u7387\u4f1a\u53d8\u5f97\u6781\u4f4e\u3002\u8fd9\u4e5f\u662fMysql\u9009\u62e9\u5c06\u6b64\u64cd\u4f5c\uff08\u9690\u5f0f\u6392\u5e8f\uff09\u5f03\u7528\u7684\u539f\u56e0\u3002<\/p>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\"><strong style=\"color: rgb(74, 74, 74);background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;width: auto;height: auto;border-style: none;border-width: 3px;border-color: rgba(0, 0, 0, 0.4);border-radius: 0px;\">\u57fa\u4e8e\u4e0a\u8ff0\u539f\u56e0\uff0cMysql\u57288.0\u65f6\uff0c\u5bf9\u6b64\u8fdb\u884c\u4e86\u4f18\u5316\u66f4\u65b0\uff1a<\/strong><\/p>\n<ul data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 8px;margin-bottom: 8px;padding-left: 25px;\" class=\"list-paddingleft-1\">\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\">https:\/\/dev.mysql.com\/doc\/refman\/8.0\/en\/order-by-optimization.html<\/section>\n<\/li>\n<\/ul>\n<blockquote data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 20px;margin-bottom: 20px;padding: 10px 10px 10px 20px;border-top: 3px none rgba(0, 0, 0, 0.4);border-bottom: 3px none rgba(0, 0, 0, 0.4);border-right: 3px none rgba(0, 0, 0, 0.4);border-left-color: rgb(53, 179, 120);border-radius: 0px;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgb(251, 249, 253);width: auto;height: auto;box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;overflow: auto;\"><p><span style=\"display: none;color: rgb(0, 0, 0);font-size: 16px;line-height: 1.5em;letter-spacing: 0em;\"><\/span><\/p>\n<p style=\"text-indent: 0em;padding-top: 16px;padding-bottom: 8px;color: rgb(63, 63, 63);font-size: 16px;line-height: 1.8em;letter-spacing: 0.02em;\">Previously (MySQL 5.7 and lower), GROUP BY sorted implicitly under certain conditions. In MySQL 8.0, that no longer occurs, so specifying ORDER BY NULL at the end to suppress implicit sorting (as was done previously) is no longer necessary. However, query results may differ from previous MySQL versions. To produce a given sort order, provide an ORDER BY clause.<\/p>\n<\/blockquote>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u5927\u81f4\u89e3\u91ca\u4e00\u4e0b\uff1a<\/p>\n<blockquote data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 20px;margin-bottom: 20px;padding: 10px 10px 10px 20px;border-top: 3px none rgba(0, 0, 0, 0.4);border-bottom: 3px none rgba(0, 0, 0, 0.4);border-right: 3px none rgba(0, 0, 0, 0.4);border-left-color: rgb(53, 179, 120);border-radius: 0px;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgb(251, 249, 253);width: auto;height: auto;box-shadow: rgba(0, 0, 0, 0) 0px 0px 0px 0px;overflow: auto;\"><p><span style=\"display: none;color: rgb(0, 0, 0);font-size: 16px;line-height: 1.5em;letter-spacing: 0em;\"><\/span><\/p>\n<p style=\"text-indent: 0em;padding-top: 16px;padding-bottom: 8px;color: rgb(63, 63, 63);font-size: 16px;line-height: 1.8em;letter-spacing: 0.02em;\">\u4ece\u524d\uff08Mysql5.7\u7248\u672c\u4e4b\u524d\uff09\uff0cGroup by\u4f1a\u6839\u636e\u786e\u5b9a\u7684\u6761\u4ef6\u8fdb\u884c\u9690\u5f0f\u6392\u5e8f\u3002\u5728mysql 8.0\u4e2d\uff0c\u5df2\u7ecf\u79fb\u9664\u4e86\u8fd9\u4e2a\u529f\u80fd\uff0c\u6240\u4ee5\u4e0d\u518d\u9700\u8981\u901a\u8fc7\u6dfb\u52a0<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">order by null<\/code> \u6765\u7981\u6b62\u9690\u5f0f\u6392\u5e8f\u4e86\uff0c\u4f46\u662f\uff0c\u67e5\u8be2\u7ed3\u679c\u53ef\u80fd\u4e0e\u4ee5\u524d\u7684 MySQL \u7248\u672c\u4e0d\u540c\u3002\u8981\u751f\u6210\u7ed9\u5b9a\u987a\u5e8f\u7684\u7ed3\u679c\uff0c\u8bf7\u6309\u901a\u8fc7ORDER BY\u6307\u5b9a\u9700\u8981\u8fdb\u884c\u6392\u5e8f\u7684\u5b57\u6bb5\u3002<\/p>\n<\/blockquote>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\"><strong style=\"color: rgb(74, 74, 74);background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;width: auto;height: auto;border-style: none;border-width: 3px;border-color: rgba(0, 0, 0, 0.4);border-radius: 0px;\">\u56e0\u6b64\uff0c\u6211\u4eec\u7684\u7ed3\u8bba\u4e5f\u51fa\u6765\u4e86\uff1a<\/strong><\/p>\n<ul data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 8px;margin-bottom: 8px;padding-left: 25px;\" class=\"list-paddingleft-1\">\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\"><strong style=\"color: rgb(74, 74, 74);background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;width: auto;height: auto;border-style: none;border-width: 3px;border-color: rgba(0, 0, 0, 0.4);border-radius: 0px;\">\u5728\u8bed\u4e49\u76f8\u540c\uff0c\u6709\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff1a<\/strong><\/section>\n<\/li>\n<\/ul>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\"><code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u548cdistinct\u90fd\u80fd\u4f7f\u7528\u7d22\u5f15\uff0c\u6548\u7387\u76f8\u540c\u3002\u56e0\u4e3a<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u548cdistinct\u8fd1\u4e4e\u7b49\u4ef7\uff0cdistinct\u53ef\u4ee5\u88ab\u770b\u505a\u662f\u7279\u6b8a\u7684<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u3002<\/p>\n<ul data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 8px;margin-bottom: 8px;padding-left: 25px;\" class=\"list-paddingleft-1\">\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\"><strong style=\"color: rgb(74, 74, 74);background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;width: auto;height: auto;border-style: none;border-width: 3px;border-color: rgba(0, 0, 0, 0.4);border-radius: 0px;\">\u5728\u8bed\u4e49\u76f8\u540c\uff0c\u65e0\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff1a<\/strong><\/section>\n<\/li>\n<\/ul>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">distinct\u6548\u7387\u9ad8\u4e8e<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u3002\u539f\u56e0\u662fdistinct \u548c <code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u90fd\u4f1a\u8fdb\u884c\u5206\u7ec4\u64cd\u4f5c\uff0c\u4f46<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u5728Mysql8.0\u4e4b\u524d\u4f1a\u8fdb\u884c\u9690\u5f0f\u6392\u5e8f\uff0c\u5bfc\u81f4\u89e6\u53d1filesort\uff0csql\u6267\u884c\u6548\u7387\u4f4e\u4e0b\u3002<\/p>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u4f46\u4eceMysql8.0\u5f00\u59cb\uff0cMysql\u5c31\u5220\u9664\u4e86\u9690\u5f0f\u6392\u5e8f\uff0c\u6240\u4ee5\uff0c\u6b64\u65f6\u5728\u8bed\u4e49\u76f8\u540c\uff0c\u65e0\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u548cdistinct\u7684\u6267\u884c\u6548\u7387\u4e5f\u662f\u8fd1\u4e4e\u7b49\u4ef7\u7684\u3002<\/p>\n<h2 data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 30px;margin-bottom: 15px;background-attachment: scroll;background-clip: border-box;background-image: url('https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801224006492.png');background-origin: padding-box;background-position: 50% 50%;background-repeat: no-repeat;background-size: 63px;width: auto;height: auto;align-items: unset;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;box-shadow: none;display: flex;flex-direction: unset;float: unset;justify-content: center;line-height: 1.5em;overflow: unset;text-shadow: none;transform: none;-webkit-box-reflect: unset;\"><span style=\"display: none;\"><\/span><span style=\"font-size: 18px;color: rgb(72, 179, 120);line-height: 2.4em;letter-spacing: 0em;margin-top: 38px;margin-bottom: 10px;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;align-items: unset;background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;box-shadow: none;display: inline-block;font-weight: bold;flex-direction: unset;float: unset;height: 38px;justify-content: unset;overflow: unset;text-align: center;text-indent: 0em;text-shadow: none;transform: none;width: auto;-webkit-box-reflect: unset;\"><strong style=\"align-items: unset;background-attachment: scroll;background-clip: border-box;background-image: none;background-origin: padding-box;background-position: 0% 0%;background-repeat: no-repeat;background-size: auto;border-style: none;border-width: 1px;border-color: rgb(0, 0, 0);border-radius: 0px;box-shadow: none;color: rgb(0, 0, 0);display: inline-block;font-size: 22px;flex-direction: unset;float: unset;height: auto;justify-content: unset;letter-spacing: 0px;line-height: 1.5em;overflow: unset;text-align: left;text-indent: 0em;text-shadow: none;transform: none;width: auto;-webkit-box-reflect: unset;\">\u63a8\u8350group by\u7684\u539f\u56e0<\/strong><\/span><span style=\"display: none;\"><\/span><\/h2>\n<ol data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"margin-top: 8px;margin-bottom: 8px;padding-left: 25px;\" class=\"list-paddingleft-1\">\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\"><code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u8bed\u4e49\u66f4\u4e3a\u6e05\u6670<\/section>\n<\/li>\n<li>\n<section style=\"margin-top: 5px;margin-bottom: 5px;color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;\"><code style=\"background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u53ef\u5bf9\u6570\u636e\u8fdb\u884c\u66f4\u4e3a\u590d\u6742\u7684\u4e00\u4e9b\u5904\u7406<\/section>\n<\/li>\n<\/ol>\n<p data-tool=\"mdnice\u7f16\u8f91\u5668\" style=\"color: rgb(63, 63, 63);line-height: 1.8em;letter-spacing: 0.02em;text-indent: 0em;padding-top: 16px;padding-bottom: 8px;\">\u76f8\u6bd4\u4e8edistinct\u6765\u8bf4\uff0c<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u7684\u8bed\u4e49\u660e\u786e\u3002\u4e14\u7531\u4e8edistinct\u5173\u952e\u5b57\u4f1a\u5bf9\u6240\u6709\u5b57\u6bb5\u751f\u6548\uff0c\u5728\u8fdb\u884c\u590d\u5408\u4e1a\u52a1\u5904\u7406\u65f6\uff0c<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u7684\u4f7f\u7528\u7075\u6d3b\u6027\u66f4\u9ad8\uff0c<code style=\"color: rgb(40, 202, 113);font-size: 14px;line-height: 1.8em;letter-spacing: 0em;background: none 0% 0% \/ auto no-repeat scroll padding-box border-box rgba(27, 31, 35, 0.05);width: auto;height: auto;margin-left: 2px;margin-right: 2px;padding: 2px 4px;border-style: none;border-width: 3px;border-color: rgb(0, 0, 0) rgba(0, 0, 0, 0.4) rgba(0, 0, 0, 0.4);border-radius: 4px;font-family: &quot;Operator Mono&quot;, Consolas, Monaco, Menlo, monospace;word-break: break-all;\">group by<\/code>\u80fd\u6839\u636e\u5206\u7ec4\u60c5\u51b5\uff0c\u5bf9\u6570\u636e\u8fdb\u884c\u66f4\u4e3a\u590d\u6742\u7684\u5904\u7406\uff0c\u4f8b\u5982\u901a\u8fc7having\u5bf9\u6570\u636e\u8fdb\u884c\u8fc7\u6ee4\uff0c\u6216\u901a\u8fc7\u805a\u5408\u51fd\u6570\u5bf9\u6570\u636e\u8fdb\u884c\u8fd0\u7b97\u3002<\/p>\n<pre style=\"outline: 0px;font-size: 16px;font-weight: 700;letter-spacing: 0.544px;text-align: left;color: rgb(0, 0, 0);background-color: rgb(255, 255, 255);font-variant-ligatures: common-ligatures;orphans: 4;widows: 1;word-spacing: 1px;caret-color: rgb(255, 0, 0);\"><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzA4NzQ0Njc4Ng==&amp;mid=2247507750&amp;idx=1&amp;sn=315655f153b28a917b7e9c5da6bba5cf&amp;chksm=903bdb4ba74c525d8ed8bf6caf7f0ded2dd447a612fdf2630092f88de4fdcf39b9267d2e1ff5&amp;scene=21#wechat_redirect\" textvalue=\"\u7a0b\u5e8f\u6c6a\u63a5\u79c1\u6d3b\u9879\u76ee\u76ee\u5f55\uff0c2023\u5e74\u603b\u7ed3\" linktype=\"text\" imgurl=\"\" imgdata=\"null\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" hasload=\"1\" style=\"outline: 0px;color: var(--weui-LINK);text-decoration: underline;cursor: pointer;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;color: rgb(0, 128, 255);\">\u7a0b\u5e8f\u6c6a\u63a5\u79c1\u6d3b\u9879\u76ee\u76ee\u5f55\uff0c2023\u5e74\u603b\u7ed3<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;text-size-adjust: inherit;word-break: break-word;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=Mzg2ODU0NTA2Mw==&amp;mid=2247488419&amp;idx=2&amp;sn=0b80c7f9f73fca89b91e257a269cfada&amp;chksm=ceabf4ebf9dc7dfdaa605a9bb92d31c9fc0a10a7a94351234181a89ba5800672c6e7da2ebfbe&amp;scene=21#wechat_redirect\" textvalue=\"Java\u9879\u76ee\u5206\u4eab  \u6700\u65b0\u6574\u7406\u5168\u96c6\uff0c\u627e\u9879\u76ee\u4e0d\u7d2f\u5566 07\u7248\" linktype=\"text\" imgurl=\"\" imgdata=\"null\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" wah-hotarea=\"click\" hasload=\"1\" style=\"outline: 0px;color: rgb(0, 128, 255);text-decoration: underline;cursor: pointer;visibility: visible;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;visibility: visible;\">Java\u9879\u76ee\u5206\u4eab \u6700\u65b0\u6574\u7406\u5168\u96c6\uff0c\u627e\u9879\u76ee\u4e0d\u7d2f\u5566 07\u7248<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzA4NzQ0Njc4Ng==&amp;mid=2247494546&amp;idx=1&amp;sn=59b54b391b4fbcc76ed1de323624fe8c&amp;chksm=903befffa74c66e9de36e77ab3fa15a90199d1a61d2c505eaef9953f949706db0fcadfaede77&amp;scene=21#wechat_redirect\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" hasload=\"1\" style=\"outline: 0px;color: rgb(0, 128, 255);text-decoration: underline;cursor: pointer;font-family: -apple-system, system-ui, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;letter-spacing: 0.544px;text-align: center;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;\">\u7a0b\u5e8f\u6c6a10\u4e07\u63a5\u7684\u65e0\u7ebf\u5171\u4eab\u5145\u7535\u5b9d\u9879\u76ee\uff0c\u5f00\u53d1\u5468\u671f3\u4e2a\u6708<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzA4NzQ0Njc4Ng==&amp;mid=2247497120&amp;idx=1&amp;sn=9cb9928998e75f156f170561ebe5b20d&amp;chksm=903bf1cda74c78db5463c269dc0e4a68f8cc441c6e8268105d80d9a4c91102750184bb3be20c&amp;scene=21#wechat_redirect\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" hasload=\"1\" style=\"outline: 0px;color: rgb(0, 128, 255);text-decoration: underline;cursor: pointer;font-family: system-ui, -apple-system, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;letter-spacing: 0.544px;text-align: center;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;\">\u7a0b\u5e8f\u6c6a1\u4e07\u63a5\u7684\u4f01\u4e1a\u5b98\u7f51\u9879\u76ee\uff0c\u5f00\u53d1\u5468\u671f15\u5929<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzA4NzQ0Njc4Ng==&amp;mid=2247500551&amp;idx=1&amp;sn=0339baf133dd89a53c9dfba583a955ca&amp;chksm=903bc76aa74c4e7cc2e7b35c51ed5c0d61cee6dbac742d0fd9207f5da76f5ce8afeb6fe7021f&amp;scene=21#wechat_redirect\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" hasload=\"1\" style=\"outline: 0px;color: rgb(0, 128, 255);text-decoration: underline;cursor: pointer;font-family: system-ui, -apple-system, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;letter-spacing: 0.544px;text-align: center;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;\">\u7a0b\u5e8f\u6c6a8\u4e07\u63a5\u7684\u5171\u4eab\u53e3\u7f69\u9879\u76ee\uff0c\u5f00\u53d1\u5468\u671f1\u4e2a\u6708<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=Mzg2ODU0NTA2Mw==&amp;mid=2247484350&amp;idx=1&amp;sn=7a558f297d9c04f87907d32cb71da797&amp;chksm=ceabe4f6f9dc6de0cd1ec5d7c96b35c70c225f60b1edc8c006f5b6a5b75e4c4591c68114d1e0&amp;scene=21#wechat_redirect\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" hasload=\"1\" style=\"outline: 0px;color: rgb(0, 128, 255);text-decoration: underline;cursor: pointer;font-family: system-ui, -apple-system, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;letter-spacing: 0.544px;text-align: center;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;\">\u7a0b\u5e8f\u6c6a8\u4e07\u5757\u7684\u996e\u6c34\u673a\u7269\u8054\u7f51\u79c1\u6d3b\u9879\u76ee\u7ecf\u9a8c\u5206\u4eab<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzA4NzQ0Njc4Ng==&amp;mid=2247493733&amp;idx=1&amp;sn=532807e655d7e6d932a7414acd100aa3&amp;chksm=903bec08a74c651ed06c9be0141de6f432250b60d45255f4ff61d8033058dc803dcdf5e09bcb&amp;scene=21#wechat_redirect\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" hasload=\"1\" style=\"outline: 0px;color: rgb(0, 128, 255);text-decoration: underline;cursor: pointer;font-family: -apple-system, system-ui, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;letter-spacing: 0.544px;text-align: center;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;\">\u7a0b\u5e8f\u6c6a\u63a5\u76844\u4e07\u667a\u6167\u9910\u996e\u9879\u76ee<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;color: rgb(63, 63, 63);letter-spacing: 0.544px;font-family: -apple-system-font, &quot;system-ui&quot;, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;line-height: 1.75em;visibility: visible;\"><a target=\"_blank\" href=\"http:\/\/mp.weixin.qq.com\/s?__biz=MzA4NzQ0Njc4Ng==&amp;mid=2247493071&amp;idx=1&amp;sn=fe6f6059883cb3c10087f36430e19cdf&amp;chksm=903be1a2a74c68b4b16d2520aa197b0d84f1043985e3e590e88e1d2f2968272fbbf0cc5091ad&amp;scene=21#wechat_redirect\" data-itemshowtype=\"0\" tab=\"innerlink\" data-linktype=\"2\" hasload=\"1\" style=\"outline: 0px;color: var(--weui-LINK);text-decoration: underline;cursor: pointer;font-family: -apple-system, system-ui, &quot;Helvetica Neue&quot;, &quot;PingFang SC&quot;, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei UI&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;letter-spacing: 0.544px;text-align: center;\" rel=\"noopener\" rel=\"nofollow\" ><span style=\"outline: 0px;cursor: pointer;letter-spacing: 0.544px;color: rgb(0, 128, 255);\">\u7a0b\u5e8f\u6c6a\u63a5\u7684\u9152\u5e97\u5728\u7ebf\u5f00\u623f\u9879\u76ee\uff0c\u53e6\u5916\u4e00\u4e2a\u597d\u542c\u7684\u540d\u5b57\u53eb\u667a\u6167\u9152\u5e97<\/span><\/a><\/p><p style=\"outline: 0px;text-wrap: wrap;font-family: &quot;Helvetica Neue&quot;, Helvetica, &quot;Hiragino Sans GB&quot;, &quot;Microsoft YaHei&quot;, Arial, sans-serif;letter-spacing: 2px;word-spacing: 2px;\"><\/p><p style=\"outline: 0px;text-wrap: wrap;font-family: &quot;Helvetica Neue&quot;, Helvetica, 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