{"id":623,"date":"2023-05-28T01:50:45","date_gmt":"2023-05-27T17:50:45","guid":{"rendered":"https:\/\/xinchewhd.com.cn\/?p=623"},"modified":"2023-05-28T01:50:45","modified_gmt":"2023-05-27T17:50:45","slug":"mysql%e5%85%81%e8%ae%b8%e5%ad%97%e6%ae%b5%e4%b8%banull%e4%bc%9a%e5%af%bc%e8%87%b45%e4%b8%aa%e9%97%ae%e9%a2%98%ef%bc%8c%e4%b8%aa%e4%b8%aa%e8%87%b4%e5%91%bd%ef%bc%81","status":"publish","type":"post","link":"https:\/\/xinchewhd.com.cn\/index.php\/mysql\/mysql%e5%85%81%e8%ae%b8%e5%ad%97%e6%ae%b5%e4%b8%banull%e4%bc%9a%e5%af%bc%e8%87%b45%e4%b8%aa%e9%97%ae%e9%a2%98%ef%bc%8c%e4%b8%aa%e4%b8%aa%e8%87%b4%e5%91%bd%ef%bc%81\/","title":{"rendered":"MySQL\u5141\u8bb8\u5b57\u6bb5\u4e3anull\u4f1a\u5bfc\u81f45\u4e2a\u95ee\u9898\uff0c\u4e2a\u4e2a\u81f4\u547d\uff01"},"content":{"rendered":"
\n
<\/section>\n

\u5f88\u591a\u5c0f\u77e5\u8bc6\u70b9\uff0c\u6211\u4ee5\u4e3a\u81ea\u5df1\u61c2\u4e86\uff0c\u5b9e\u9645\u6ca1\u641e\u900f\u3002<\/span><\/p>\n

\u6570\u636e\u5e93\u5b57\u6bb5\u5141\u8bb8\u7a7a\u503c(null)\u7684\u95ee\u9898\uff0c\u4f60\u9047\u5230\u8fc7\u5417\uff1f<\/span><\/p>\n

\u5728\u9a8c\u8bc1\u95ee\u9898\u4e4b\u524d\uff0c\u6211\u4eec\u5148\u5efa\u4e00\u5f20\u6d4b\u8bd5\u8868\u53ca\u6d4b\u8bd5\u6570\u636e\u3002<\/p>\n

\u6784\u5efa\u7684\u6d4b\u8bd5\u6570\u636e\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

\u6709\u4e86\u4e0a\u9762\u7684\u8868<\/span>\u53ca\u6570\u636e\u4e4b\u540e\uff0c\u6211\u4eec\u5c31\u6765\u770b\u5f53\u5217\u4e2d\u5b58\u5728\u00a0<\/span>NULL<\/code>\u00a0\u503c\u65f6\uff0c\u7a76\u7adf\u4f1a\u5bfc\u81f4\u54ea\u4e9b\u95ee\u9898\uff1f<\/span><\/p>\n

1.count \u6570\u636e\u4e22\u5931<\/span><\/p>\n

\u6211\u4eec\u90fd\u77e5\u9053\uff0ccount\u662f\u7528\u6765\u8ba1\u6570\u7684\uff0c\u5f53\u8868\u4e2d\u67d0\u4e2a\u5b57\u6bb5\u5b58\u5728NULL<\/code>\u00a0<\/span>\u503c\u65f6\uff0c\u5c31\u4f1a\u9020\u6210count\u8ba1\u7b97\u51fa\u6765\u7684\u6570\u636e\u4e22\u5931\uff0c\u5982\u4e0b SQL \u6240\u793a\uff1a<\/span><\/p>\n

\u67e5\u8be2\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

\u89e3\u51b3\u65b9\u6848<\/h4>\n

\u5982\u679c\u67d0\u5217\u5b58\u5728\u00a0NULL<\/code>\u00a0\u503c\u65f6\uff0c\u5c31\u662f\u7528\u00a0count(*)<\/code>\u00a0\u8fdb\u884c\u6570\u636e\u7edf\u8ba1\u3002<\/p>\n

\u6269\u5c55\u77e5\u8bc6\uff1a\u4e0d\u8981\u4f7f\u7528 count(\u5e38\u91cf)<\/h4>\n
\n

\u8bf4\u660e\uff1a<\/span>count(*) \u4f1a\u7edf\u8ba1\u503c\u4e3a NULL \u7684\u884c\uff0c\u800c count(\u5217\u540d) \u4e0d\u4f1a\u7edf\u8ba1\u6b64\u5217\u4e3a NULL \u503c\u7684\u884c\u3002<\/span><\/p>\n<\/blockquote>\n

2.distinct \u6570\u636e\u4e22\u5931<\/span><\/h1>\n

\u5f53\u4f7f\u7528\u8bed\u53e5count(distinct column1,column2)<\/code>\u65f6\uff0c\u5982\u679c\u6709\u4e00\u4e2a\u5b57\u6bb5\u503c\u4e3a\u7a7a\uff0c\u5373\u4f7f\u53e6\u4e00\u5217\u6709\u4e0d\u540c\u7684\u503c\uff0c\u90a3\u4e48\u67e5\u8be2\u7684\u7ed3\u679c\u4e5f\u4f1a\u5c06\u6570\u636e\u4e22\u5931\uff0c\u00a0SQL\u5982\u4e0b\u6240\u793a\uff1a<\/span><\/p>\n

\u67e5\u8be2\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

3.select \u6570\u636e\u4e22\u5931<\/span><\/p>\n

\u5982\u679c\u67d0\u5217\u5b58\u5728\u00a0NULL<\/code>\u00a0\u503c\u65f6\uff0c\u5982\u679c\u6267\u884c\u975e\u7b49\u4e8e\u67e5\u8be2\uff08<>\u6216\u8005!=\uff09\u4f1a\u5bfc\u81f4\u4e3a\u00a0NULL<\/code>\u00a0\u503c\u7684\u7ed3\u679c\u4e22\u5931\uff0c\u6bd4\u5982\u4e0b\u9762\u7684\u8fd9\u4e9b\u6570\u636e\uff1a<\/p>\n

\u67e5\u8be2\u7ed3\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/span><\/p>\n

\u89e3\u51b3\u65b9\u6848<\/span><\/h3>\n

\u8981\u89e3\u51b3\u4ee5\u4e0a\u7684\u95ee\u9898\uff0c\u53ea\u8981\u4fee\u6539\u6761\u4ef6\uff0c\u5c06\u59d3\u540d\u4e0d\u7b49\u4e8e<\/span>Java<\/span>\u6216\u8005\u662f\u7a7a\u503c\u7684\u67e5\u51fa\u6765\u5373\u53ef<\/span>\uff0c\u6267\u884c SQL \u5982\u4e0b\uff1a<\/p>\n

\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

4.\u5bfc\u81f4\u7a7a\u6307\u9488\u5f02\u5e38<\/span><\/p>\n

\u5f53\u6211\u4eec\u4f7f\u7528\u4e00\u4e9b\u51fd\u6570\uff0c\u6bd4\u5982\u6c42\u548c\u51fd\u6570sum(column)<\/code>\u00a0<\/span>\u6216\u8005\u5e73\u5747\u503c\u4e4b\u7c7b\u7684\u51fd\u6570\uff0c\u5982\u679c\u6240\u6c42\u7684\u5b57\u6bb5\u4e2d\u6709\u7a7a\u503c\uff0c\u6240\u6c42\u7684\u503c\u5c31\u4f1a\u4e3a\u7a7a\u800c\u975e0\u3002<\/p>\n

\u5982\u679c\u00a0<\/span>sum<\/code>\u00a0\u67e5\u8be2\u7684\u7ed3\u679c\u4e3a\u00a0<\/span>NULL<\/code>\u00a0\u5c31\u53ef\u4ee5\u80fd\u4f1a\u5bfc\u81f4\u7a0b\u5e8f\u6267\u884c\u65f6\u7a7a\u6307\u9488\u5f02\u5e38\uff08NPE\uff09\uff0c\u6211\u4eec\u6765\u6f14\u793a\u4e00\u4e0b\u8fd9\u4e2a\u95ee\u9898\u3002<\/span><\/p>\n

\u4e3a\u4e86\u6f14\u793a\u8fd9\u4e2a\u95ee\u9898\uff0c\u9996\u5148\u6211\u4eec\u5148\u6784\u5efa\u4e00\u5f20\u8868\u548c\u4e00\u4e9b\u6d4b\u8bd5\u6570\u636e\uff1a<\/p>\n

\u8868\u4e2d\u539f\u59cb\u6570\u636e\u5982\u4e0b\uff1a<\/p>\n

\u67e5\u8be2\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

\u89e3\u51b3\u7a7a\u6307\u9488\u5f02\u5e38<\/span><\/h3>\n

\u53ef\u4ee5\u4f7f\u7528ifnull()\u5bf9\u7a7a\u503c\u8fdb\u884c\u5904\u7406\u6765\u907f\u514d\u7a7a\u6307\u9488\u5f02\u5e38\uff1a<\/p>\n

\u67e5\u8be2\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

\u5f53\u5b57\u6bb5\u4e2d\u6709\u4e86\u7a7a\u503c\uff0c\u5bf9\u4e8enull<\/code>\u503c\u6216\u8005\u975en<\/span>ull<\/span>\u503c\u7684\u67e5\u8be2\u96be\u5ea6\u5c31\u589e\u52a0\u4e86\uff0c\u5fc5\u987b\u4f7f\u7528\u4e0enull\u5339\u914d\u7684\u67e5\u8be2\u65b9\u6cd5\uff0c\u6bd4\u5982IS NULL<\/span>\u6216\u8005IS NOT NULL<\/span>\u53c8\u6216\u8005\u662fIFNULL(cloumn)<\/span>\u8fd9\u6837\u7684\u8868\u8fbe\u5f0f\u8fdb\u884c\u67e5\u8be2\uff0c\u4f20\u7edf\u7684\u00a0<\/span>=\u3001!=\u3001<>...<\/code>\u8fd9\u4e9b\u8868\u8fbe\u5f0f\u5c31\u4e0d\u80fd\u4f7f\u7528\u4e86\uff0c\u8fd9\u5c31\u589e\u52a0\u4e86\u67e5\u8be2\u7684\u96be\u5ea6\u3002<\/p>\n

\u8fd8\u662f\u4ee5\u00a0person<\/code>\u00a0\u8868\u4e3a\u4f8b\uff0c\u5b83\u7684\u539f\u59cb\u6570\u636e\u5982\u4e0b\uff1a<\/p>\n

\u6267\u884c\u7ed3\u679c\u4e3a\u7a7a\uff0c\u5e76\u6ca1\u6709\u67e5\u8be2\u5230\u4efb\u4f55\u6570\u636e\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

\u6267\u884c\u7ed3\u679c\u4e5f\u4e3a\u7a7a\uff0c\u6ca1\u6709\u67e5\u8be2\u5230\u4efb\u4f55\u6570\u636e\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n

\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

\u6267\u884c\u7ed3\u679c\u5982\u4e0b\uff1a<\/p>\n

\u963f\u91cc\u5df4\u5df4\u300aJava\u5f00\u53d1\u624b\u518c\u300b\u63a8\u8350\u6211\u4eec\u4f7f\u7528\u00a0ISNULL(cloumn)<\/code>\u00a0\u6765\u5224\u65ad\u00a0NULL<\/code>\u00a0\u503c<\/strong>\uff0c\u539f\u56e0\u662f\u5728 SQL \u8bed\u53e5\u4e2d\uff0c\u5982\u679c\u5728 null \u524d\u6362\u884c\uff0c\u5f71\u54cd\u53ef\u8bfb\u6027\uff1b\u800c\u00a0ISNULL(column)<\/code>\u00a0\u662f\u4e00\u4e2a\u6574\u4f53\uff0c\u7b80\u6d01\u6613\u61c2\u3002\u4ece\u6027\u80fd\u6570\u636e\u4e0a\u5206\u6790\u00a0ISNULL(column)<\/code>\u00a0\u6267\u884c\u6548\u7387\u4e5f\u66f4\u5feb\u4e00\u4e9b\u3002<\/p>\n

\u603b\u7ed3<\/span><\/p>\n

\u672c\u6587\u6211\u4eec\u8bb2\u4e86\u5f53\u67d0\u5217\u4e3a\u00a0NULL<\/code>\u00a0\u65f6\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7684 5 \u79cd\u95ee\u9898\uff1a\u4e22\u5931\u67e5\u8be2\u7ed3\u679c\u3001\u5bfc\u81f4\u7a7a\u6307\u9488\u5f02\u5e38\u548c\u589e\u52a0\u4e86\u67e5\u8be2\u7684\u96be\u5ea6\u3002\u56e0\u6b64\u5728\u6700\u540e\u63d0\u5021\u5927\u5bb6\u5728\u521b\u5efa\u8868\u7684\u65f6\u5019\u5c3d\u91cf\u8bbe\u7f6e\u00a0is not null<\/code>\u00a0\u7684\u7ea6\u675f\uff0c\u5982\u679c\u67d0\u5217\u786e\u5b9e\u6ca1\u6709\u503c\uff0c\u53ef\u4ee5\u8bbe\u7f6e\u7a7a\u503c\uff08''\uff09\u6216 0 \u4f5c\u4e3a\u5176\u9ed8\u8ba4\u503c\u3002<\/p>\n

\u00b7END\u00b7<\/strong><\/p>\n

\n

\u672c\u7bc7\u6587\u7ae0\u6765\u6e90\u4e8e\u5fae\u4fe1\u516c\u4f17\u53f7: IT\u725b\u5ba2<\/p><\/blockquote>\n<\/div>\n","raw":"","protected":false},"excerpt":{"rendered":"

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