{"id":4979,"date":"2024-08-01T22:49:11","date_gmt":"2024-08-01T14:49:11","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=4979"},"modified":"2024-08-02T15:11:24","modified_gmt":"2024-08-02T07:11:24","slug":"mysql%e5%8d%83%e4%b8%87%e7%ba%a7%e6%95%b0%e6%8d%ae%e6%9f%a5%e8%af%a2%e4%bb%8e190%e7%a7%92%e4%bc%98%e5%8c%96%e8%87%b31%e7%a7%92%e7%9a%84%e6%b7%b1%e5%ba%a6%e5%ae%9e%e8%b7%b5","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/mysql\/mysql%e5%8d%83%e4%b8%87%e7%ba%a7%e6%95%b0%e6%8d%ae%e6%9f%a5%e8%af%a2%e4%bb%8e190%e7%a7%92%e4%bc%98%e5%8c%96%e8%87%b31%e7%a7%92%e7%9a%84%e6%b7%b1%e5%ba%a6%e5%ae%9e%e8%b7%b5\/","title":{"rendered":"MySQL\u5343\u4e07\u7ea7\u6570\u636e\u67e5\u8be2\u4ece190\u79d2\u4f18\u5316\u81f31\u79d2\u7684\u6df1\u5ea6\u5b9e\u8df5"},"content":{"rendered":"
\n

\u5728\u5927\u6570\u636e\u65f6\u4ee3\uff0c\u6570\u636e\u5e93\u7684\u6027\u80fd\u4f18\u5316\u5c24\u4e3a\u91cd\u8981\u3002\u9762\u5bf9\u5343\u4e07\u7ea7\u6570\u636e\u89c4\u6a21\uff0c\u6beb\u79d2\u7ea7\u522b\u7684\u54cd\u5e94\u65f6\u95f4\u5f80\u5f80\u6210\u4e3a\u8861\u91cf\u7cfb\u7edf\u6548\u80fd\u7684\u5173\u952e\u6307\u6807\u3002\u672c\u6587\u5c06\u4ee5\u4e00\u4e2a\u771f\u5b9e\u7684MySQL\u67e5\u8be2\u4f18\u5316\u6848\u4f8b\uff0c\u8be6\u8ff0\u4e00\u6b21\u4ece\u521d\u59cb\u8017\u65f6190\u79d2\u964d\u81f3\u4ec5\u97001\u79d2\u7684\u5168\u8fc7\u7a0b\uff0c\u901a\u8fc7\u6df1\u5165\u5256\u6790\u95ee\u9898\u3001\u5236\u5b9a\u7b56\u7565\u3001\u5b9e\u65bd\u4f18\u5316\u4ee5\u53ca\u6548\u679c\u9a8c\u8bc1\uff0c\u63ed\u793a\u63d0\u5347\u6570\u636e\u5e93\u67e5\u8be2\u6548\u7387\u7684\u5b9e\u6218\u8def\u5f84\u3002<\/p>\n

\u4e00\u3001\u95ee\u9898\u53d1\u73b0\u4e0e\u8bca\u65ad<\/span><\/strong>\u67d0\u4e1a\u52a1\u7cfb\u7edf\u4e2d\u5b58\u5728\u4e00\u4e2a\u6d89\u53ca\u5343\u4e07\u7ea7\u6570\u636e\u7684\u590d\u6742\u67e5\u8be2\uff0c\u7528\u6237\u53cd\u9988\u67e5\u8be2\u54cd\u5e94\u65f6\u95f4\u8fc7\u957f\uff0c\u7ecf\u8fc7\u6392\u67e5\u53d1\u73b0\u5176\u6267\u884c\u65f6\u95f4\u4e3a\u60ca\u4eba\u7684190\u79d2\u3002\u4e3a\u627e\u5230\u95ee\u9898\u75c7\u7ed3\uff0c\u6211\u4eec\u9996\u5148\u5bf9\u539f\u59cbSQL\u8bed\u53e5\u8fdb\u884c\u4e86\u5982\u4e0b\u5206\u6790\uff1a<\/span><\/p>\n

\n
SELECT<\/span> * <\/span><\/code>FROM<\/span> orders o <\/span><\/code>JOIN<\/span> customers c ON<\/span> o.customer_id = c.id <\/span><\/code>JOIN<\/span> products p ON<\/span> o.product_id = p.id <\/span><\/code>WHERE<\/span> o.order_date BETWEEN<\/span> '2023-01-01'<\/span> AND<\/span> '2023-12-31'<\/span><\/span><\/code>AND<\/span> c.country = 'USA'<\/span><\/span><\/code>AND<\/span> p.category = 'Electronics'<\/span>;<\/span><\/code><\/pre>\n<\/section>\n
\u901a\u8fc7MySQL\u7684EXPLAIN\u547d\u4ee4\uff0c\u6211\u4eec\u83b7\u53d6\u4e86\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\uff1a<\/p>\n
\n
+----+-------------+-------+--------+---------------+---------+---------+---------------------+------+-------------+<\/span><\/code>\n| id |<\/span> select_type | table |<\/span> type   | possible_keys |<\/span> key     | key_len |<\/span> ref                 | rows |<\/span> Extra       |<\/span><\/span><\/code>\n+----+-------------+-------+--------+---------------+---------+---------+---------------------+------+-------------+<\/span><\/code>\n|<\/span>1<\/span>|SIMPLE|<\/span>o|ALL|<\/span>NULL|NULL|<\/span>NULL|NULL|<\/span>500<\/span>K|Usingwhere|<\/span><\/span><\/code>\n|  1 |<\/span> SIMPLE      | c     |<\/span> eq_ref | PRIMARY       |<\/span> PRIMARY | 4       |<\/span> db.o.customer_id    |    1 |<\/span> Using where |<\/span><\/span><\/code>\n|<\/span>1<\/span>|SIMPLE|<\/span>p|eq_ref|<\/span>PRIMARY|PRIMARY|<\/span>4<\/span>|db.o.product_id|<\/span>1<\/span>|Usingwhere|<\/span><\/span><\/code>\n+----+-------------+-------+--------+---------------+---------+---------+---------------------+------+-------------+<\/span><\/code><\/pre>\n<\/section>\n
\u95ee\u9898\u8bca\u65ad\uff1a<\/p>\n
\n
1.\u5168\u8868\u626b\u63cf\uff1aorders\u8868\u672a\u4f7f\u7528\u4efb\u4f55\u7d22\u5f15\u6765\u6267\u884c\u67e5\u8be2\uff0c\u5bfc\u81f4\u8fdb\u884c\u5168\u8868\u626b\u63cf\uff0c\u6d88\u8017\u5927\u91cfIO\u8d44\u6e90\u3002<\/span><\/code>\n2.\u5173\u8054\u67e5\u8be2\uff1a\u4e09\u4e2a\u5927\u8868\u8fdb\u884c\u7b49\u503c\u8fde\u63a5\uff0c\u6570\u636e\u91cf\u7ea7\u7684\u4e58\u79ef\u53ef\u80fd\u5bfc\u81f4\u67e5\u8be2\u8fc7\u7a0b\u4e2d\u7684\u4e34\u65f6\u8868\u8fc7\u5927\uff0c\u589e\u52a0CPU\u548c\u5185\u5b58\u538b\u529b\u3002<\/span><\/code>\n3.\u7f3a\u5c11\u6709\u6548\u7d22\u5f15\uff1a\u5173\u952e\u67e5\u8be2\u6761\u4ef6\uff08\u5982order_date\u3001country\u3001category\uff09\u672a\u5229\u7528\u5230\u7d22\u5f15\uff0c\u5f71\u54cd\u67e5\u8be2\u6548\u7387\u3002<\/span><\/code><\/pre>\n<\/section>\n
\u4e8c\u3001\u4f18\u5316\u7b56\u7565\u5236\u5b9a<\/strong>\u57fa\u4e8e\u4e0a\u8ff0\u95ee\u9898\u8bca\u65ad\uff0c\u6211\u4eec\u5236\u5b9a\u4e86\u4ee5\u4e0b\u4f18\u5316\u7b56\u7565\uff1a<\/span><\/p>\n
\n
1.\u521b\u5efa\u9002\u5f53\u7d22\u5f15\uff1a\u4e3aorders\u8868\u7684order_date\u5b57\u6bb5\u3001customers\u8868\u7684country\u5b57\u6bb5\u548cproducts\u8868\u7684category\u5b57\u6bb5\u521b\u5efa\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002<\/span><\/code>2.\u8c03\u6574\u67e5\u8be2\u8bed\u53e5\uff1a\u907f\u514d\u5168\u8868\u626b\u63cf\uff0c\u4f18\u5316\u5173\u8054\u67e5\u8be2\uff0c\u51cf\u5c11\u4e2d\u95f4\u7ed3\u679c\u96c6\u5927\u5c0f\u3002<\/span><\/code>3.\u786c\u4ef6\u4f18\u5316\uff1a\u8003\u8651\u5347\u7ea7\u786c\u4ef6\u8d44\u6e90\u6216\u8c03\u6574\u6570\u636e\u5e93\u53c2\u6570\uff0c\u5982\u589e\u5927\u7f13\u51b2\u6c60\u3001\u8c03\u6574\u5e76\u53d1\u53c2\u6570\u7b49\uff0c\u4f46\u5728\u6b64\u6848\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06\u4e3b\u8981\u5173\u6ce8SQL\u4f18\u5316<\/span><\/code><\/pre>\n<\/section>\n
\u4e09\u3001\u5b9e\u65bd\u4f18\u5316<\/strong><\/span><\/p>\n
\n
1.\u521b\u5efa\u7d22\u5f15\uff1a<\/span><\/code>CREATE<\/span> INDEX<\/span> idx_orders_order_date ON<\/span> orders(order_date);<\/span><\/code>CREATE<\/span> INDEX<\/span> idx_customers_country ON<\/span> customers(country);<\/span><\/code>CREATE<\/span> INDEX<\/span> idx_products_category ON<\/span> products(category<\/span>);<\/span><\/code><\/code>2.\u8c03\u6574\u67e5\u8be2\u8bed\u53e5\uff1a<\/span><\/code>\u8003\u8651\u5230orders\u8868\u7684\u6570\u636e\u91cf\u6700\u5927\uff0c\u4e14\u67e5\u8be2\u6761\u4ef6\u8f83\u4e3a\u590d\u6742\uff0c\u6211\u4eec\u91c7\u7528\u5b50\u67e5\u8be2\u7684\u65b9\u5f0f\u5148\u7b5b\u9009\u51fa\u6ee1\u8db3\u6761\u4ef6\u7684\u8ba2\u5355ID\uff0c\u518d\u8fdb\u884c\u5173\u8054\u67e5\u8be2\uff0c\u51cf\u5c11\u4e2d\u95f4\u7ed3\u679c\u96c6\u7684\u5927\u5c0f\uff1a<\/span><\/code>SELECT<\/span> *<\/span><\/code>FROM<\/span> (<\/span><\/code>  SELECT<\/span> o.id<\/span><\/code>  FROM<\/span> orders o<\/span><\/code>  WHERE<\/span> o.order_date BETWEEN<\/span> '2023-01-01'<\/span> AND<\/span> '2023-12-31'<\/span><\/span><\/code>) subquery<\/span><\/code>JOIN<\/span> customers c ON<\/span> subquery.id = c.id <\/span><\/code>JOIN<\/span> products p ON<\/span> subquery.id = p.id <\/span><\/code>WHERE<\/span> c.country = 'USA'<\/span><\/span><\/code>AND<\/span> p.category = 'Electronics'<\/span>;<\/span><\/code><\/pre>\n<\/section>\n
\u56db\u3001\u6548\u679c\u9a8c\u8bc1<\/strong><\/span>\u518d\u6b21\u4f7f\u7528EXPLAIN\u547d\u4ee4\u67e5\u770b\u4f18\u5316\u540e\u7684\u67e5\u8be2\u6267\u884c\u8ba1\u5212\uff1a<\/span><\/p>\n
\n
+----+-------------+------------+--------+---------------+--------------+---------+---------------------+------+-------------+<\/span><\/code>| id |<\/span> select_type | table      |<\/span> type   | possible_keys |<\/span> key          | key_len |<\/span> ref                 | rows |<\/span> Extra       |<\/span><\/span><\/code>+----+-------------+------------+--------+---------------+--------------+---------+---------------------+------+-------------+<\/span><\/code>|<\/span>1<\/span>|PRIMARY|<\/span><subquery>|ALL|<\/span>NULL|NULL|<\/span>NULL|NULL|<\/span>80<\/span>K||<\/span><\/span><\/code>|  1 |<\/span> PRIMARY     | c          |<\/span> eq_ref | PRIMARY       |<\/span> PRIMARY      | 4       |<\/span> db.subquery.id      |    1 |<\/span> Using where |<\/span><\/span><\/code>|<\/span>1<\/span>|PRIMARY|<\/span>p|eq_ref|<\/span>PRIMARY|PRIMARY|<\/span>4<\/span>|db.subquery.id|<\/span>1<\/span>|Usingwhere|<\/span><\/span><\/code>|  2 |<\/span> MATERIALIZED| o          |<\/span> range  | idx_orders_order_date |<\/span> idx_orders_order_date | 5       |<\/span> NULL                |  80K |<\/span> Using where |<\/span><\/span><\/code>+----+-------------+------------+--------+---------------+--------------+---------+---------------------+------+-------------+<\/span><\/code><\/pre>\n<\/section>\n
\u53ef\u4ee5\u770b\u5230\uff0c\u4f18\u5316\u540e\uff1a<\/p>\n
\n
1.orders\u8868\u4f7f\u7528\u4e86\u65b0\u521b\u5efa\u7684idx_orders_<\/span>order_date\u7d22\u5f15\u6765\u6267\u884c\u8303\u56f4\u67e5\u8be2\uff0c\u907f\u514d\u4e86\u5168\u8868\u626b\u63cf\u3002<\/span><\/code>2.\u5b50\u67e5\u8be2\u5927\u5927\u51cf\u5c11\u4e86\u5173\u8054\u67e5\u8be2\u7684\u6570\u636e\u91cf\uff0c\u4ece\u539f\u6765\u7684500\u4e07\u884c\u51cf\u5c11\u523080\u4e07\u884c\uff0c\u663e\u8457\u964d\u4f4e\u4e86\u4e2d\u95f4\u7ed3\u679c\u96c6\u5927\u5c0f\u3002<\/span><\/code>3.\u5173\u8054\u67e5\u8be2\u4f9d\u7136\u4f7f\u7528\u4e86\u4e3b\u952e\u7d22\u5f15\uff0c\u4fdd\u6301\u9ad8\u6548\u3002<\/span><\/code><\/pre>\n<\/section>\n
\u5b9e\u9645\u6267\u884c\u4f18\u5316\u540e\u7684\u67e5\u8be2\uff0c\u54cd\u5e94\u65f6\u95f4\u5df2\u964d\u81f31\u79d2\uff0c\u4f18\u5316\u6548\u679c\u663e\u8457\u3002<\/p>\n
\u4e94\u3001\u603b\u7ed3<\/strong>\u901a\u8fc7\u6df1\u5165\u5206\u6790\u3001\u5236\u5b9a\u7b56\u7565\u3001\u5b9e\u65bd\u4f18\u5316\u4ee5\u53ca\u6548\u679c\u9a8c\u8bc1\uff0c\u6211\u4eec\u6210\u529f\u5c06\u4e00\u4e2a\u539f\u672c\u8017\u65f6190\u79d2\u7684MySQL\u5343\u4e07\u7ea7\u6570\u636e\u67e5\u8be2\u4f18\u5316\u5230\u4e861\u79d2\u4ee5\u5185\u3002\u6b64\u6b21\u4f18\u5316\u7684\u5173\u952e\u5728\u4e8e\uff1a<\/span><\/p>\n
\n
1.\u8bc6\u522b\u95ee\u9898\uff1a\u501f\u52a9EXPLAIN<\/span>\u547d\u4ee4\u7406\u89e3\u67e5\u8be2\u6267\u884c\u8ba1\u5212\uff0c\u627e\u51fa\u5168\u8868\u626b\u63cf\u3001\u5173\u8054\u67e5\u8be2\u8fc7\u5927\u3001\u7f3a\u4e4f\u6709\u6548\u7d22\u5f15\u7b49\u95ee\u9898\u3002<\/span><\/code>2.<\/span>\u5236\u5b9a\u7b56\u7565\uff1a\u521b\u5efa\u9002\u5f53\u7d22\u5f15\uff0c\u8c03\u6574\u67e5\u8be2\u8bed\u53e5\u4ee5\u51cf\u5c11\u4e2d\u95f4\u7ed3\u679c\u96c6\uff0c\u8003\u8651\u786c\u4ef6\u4f18\u5316\uff08\u672c\u6b21\u6848\u4f8b\u4e2d\u672a\u5b9e\u65bd\uff09\u3002<\/span><\/code>3.<\/span>\u5b9e\u65bd\u4f18\u5316\uff1a\u6267\u884cSQL<\/span>\u8bed\u53e5\u521b\u5efa\u7d22\u5f15\uff0c\u8c03\u6574\u67e5\u8be2\u7ed3\u6784\u4e3a\u5b50\u67e5\u8be2\u5148\u884c\u7b5b\u9009\u3002<\/span><\/code>4.<\/span>\u9a8c\u8bc1\u6548\u679c\uff1a\u518d\u6b21\u4f7f\u7528EXPLAIN<\/span>\u5bf9\u6bd4\u4f18\u5316\u524d\u540e\u6267\u884c\u8ba1\u5212\u53d8\u5316\uff0c\u5b9e\u9645\u8fd0\u884c\u67e5\u8be2\u9a8c\u8bc1\u54cd\u5e94\u65f6\u95f4\u5927\u5e45\u4e0b\u964d\u3002<\/span><\/code><\/pre>\n<\/section>\n
\u8fd9\u4e2a\u6848\u4f8b\u5145\u5206\u5c55\u793a\u4e86\u9488\u5bf9\u5927\u89c4\u6a21\u6570\u636e\u67e5\u8be2\u8fdb\u884cSQL\u4f18\u5316\u7684\u91cd\u8981\u6027\u4e0e\u5b9e\u6548\u6027\uff0c\u4e3a\u7c7b\u4f3c\u573a\u666f\u4e0b\u7684\u6027\u80fd\u8c03\u4f18\u63d0\u4f9b\u4e86\u5b9e\u7528\u53c2\u8003\u3002\u5728\u5b9e\u9645\u5de5\u4f5c\u4e2d\uff0c\u5e94\u6301\u7eed\u76d1\u63a7\u6570\u636e\u5e93\u6027\u80fd\uff0c\u53ca\u65f6\u53d1\u73b0\u5e76\u89e3\u51b3\u6027\u80fd\u74f6\u9888\uff0c\u786e\u4fdd\u7cfb\u7edf\u7684\u9ad8\u6548\u7a33\u5b9a\u8fd0\u884c\u3002<\/p>\n
\n
\u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7: IT\u667a\u6167\u8c37<\/p><\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"
\u5728\u5927\u6570\u636e\u65f6\u4ee3\uff0c\u6570\u636e\u5e93\u7684\u6027\u80fd\u4f18\u5316\u5c24\u4e3a\u91cd\u8981\u3002\u9762\u5bf9\u5343\u4e07\u7ea7\u6570\u636e\u89c4\u6a21\uff0c\u6beb\u79d2\u7ea7\u522b\u7684\u54cd\u5e94\u65f6\u95f4\u5f80\u5f80\u6210\u4e3a\u8861\u91cf\u7cfb\u7edf\u6548\u80fd\u7684\u5173\u952e\u6307\u6807\u3002\u672c\u6587\u5c06\u4ee5\u4e00\u4e2a\u771f\u5b9e\u7684M …<\/p>\n","protected":false},"author":1,"featured_media":4969,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"emotion":"","emotion_color":"","title_style":"","license":"","footnotes":""},"categories":[3],"tags":[],"class_list":["post-4979","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mysql"],"post_thumbnail_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801214817830-150x150.jpeg","content_first_image":null,"post_medium_image_300":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801214817830-300x127.jpeg","post_thumbnail_image_624":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801214817830-1024x434.jpeg","post_frist_image":null,"post_medium_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801214817830-300x127.jpeg","post_large_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801214817830-1024x434.jpeg","post_full_image":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2024\/08\/20240801214817830.jpeg","post_all_images":[],"videoAdId":"","listAd":"0","listAdId":"","listAdEvery":6,"total_comments":0,"category_name":"MySQL","post_date":"2024-08-01","like_count":"0","praiseWord":"\u9f13\u52b1","copyright_state":"","excitationAd":"0","rewardedVideoAdId":"","detailAdId":"","detailAd":"0","enterpriseMinapp":"0","audios":[],"postImageUrl":"https:\/\/wp-moto-1258805347.cos.ap-shanghai.myqcloud.com\/2023\/05\/20230519082947553.jpg","avatarurls":[],"related_posts":null,"pageviews":357,"next_post_id":6509,"next_post_title":"CPU \u72c2\u98d9 900%\uff0c\u8be5\u600e\u4e48\u5904\u7406\uff1f","previous_post_id":5306,"previous_post_title":"(\u4e03)MySQL\u4e8b\u52a1\u7bc7\uff1aACID\u539f\u5219\u3001\u4e8b\u52a1\u9694\u79bb\u7ea7\u522b\u53ca\u4e8b\u52a1\u673a\u5236\u539f\u7406\u5256\u6790","_links":{"self":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/4979","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/comments?post=4979"}],"version-history":[{"count":2,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/4979\/revisions"}],"predecessor-version":[{"id":6395,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/posts\/4979\/revisions\/6395"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media\/4969"}],"wp:attachment":[{"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/media?parent=4979"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/categories?post=4979"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/xinchewhd.com.cn\/index.php\/wp-json\/wp\/v2\/tags?post=4979"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}