{"id":152683,"date":"2024-11-02T01:09:18","date_gmt":"2024-11-01T17:09:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/152683\/"},"modified":"2024-11-02T01:09:19","modified_gmt":"2024-11-01T17:09:19","slug":"%e6%9f%a5%e6%89%be%e5%85%a9%e5%88%97%e4%b8%ad%e4%b8%8d%e9%87%8d%e8%a4%87%e7%9a%84%e6%95%b8%e6%93%9a%e5%ba%ab%ef%bc%9a%e7%b0%a1%e6%98%93%e6%95%99%e7%a8%8b-%e6%9f%a5%e5%85%a9%e5%88%97%e4%b8%ad%e4%b8%8d","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/152683\/","title":{"rendered":"\u67e5\u627e\u5169\u5217\u4e2d\u4e0d\u91cd\u8907\u7684\u6578\u64da\u5eab\uff1a\u7c21\u6613\u6559\u7a0b (\u67e5\u5169\u5217\u4e2d\u4e0d\u91cd\u8907\u7684\u6578\u64da\u5eab)"},"content":{"rendered":"

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\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u67e5\u627e\u4e0d\u91cd\u8907\u7684\u6578\u64da\u662f\u4e00\u500b\u5e38\u898b\u7684\u9700\u6c42\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u578b\u6578\u64da\u96c6\u6642\uff0c\u80fd\u5920\u6709\u6548\u5730\u8b58\u5225\u548c\u63d0\u53d6\u4e0d\u91cd\u8907\u7684\u6578\u64da\u5c0d\u65bc\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u81f3\u95dc\u91cd\u8981\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5982\u4f55\u5728\u6578\u64da\u5eab\u4e2d\u67e5\u627e\u5169\u5217\u4e2d\u4e0d\u91cd\u8907\u7684\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u7c21\u55ae\u7684\u793a\u4f8b\u548c\u4ee3\u78bc\u7247\u6bb5\u4ee5\u5e6b\u52a9\u7406\u89e3\u3002<\/p>\n

\u6578\u64da\u5eab\u57fa\u790e\u77e5\u8b58<\/h2>\n

\u5728\u958b\u59cb\u4e4b\u524d\uff0c\u6211\u5011\u9700\u8981\u4e86\u89e3\u4e00\u4e9b\u57fa\u672c\u7684\u6578\u64da\u5eab\u6982\u5ff5\u3002\u6578\u64da\u5eab\u662f\u4e00\u7a2e\u7d50\u69cb\u5316\u7684\u6578\u64da\u5b58\u5132\u7cfb\u7d71\uff0c\u901a\u5e38\u4f7f\u7528SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f86\u9032\u884c\u6578\u64da\u64cd\u4f5c\u3002\u6578\u64da\u5eab\u4e2d\u7684\u6578\u64da\u901a\u5e38\u4ee5\u8868\u683c\u7684\u5f62\u5f0f\u5b58\u5132\uff0c\u6bcf\u500b\u8868\u683c\u7531\u884c\u548c\u5217\u7d44\u6210\u3002\u884c\u4ee3\u8868\u8a18\u9304\uff0c\u800c\u5217\u5247\u4ee3\u8868\u8a18\u9304\u7684\u5c6c\u6027\u3002<\/p>\n

\u67e5\u627e\u4e0d\u91cd\u8907\u6578\u64da\u7684\u9700\u6c42<\/h2>\n

\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u6211\u5011\u53ef\u80fd\u9700\u8981\u5f9e\u5169\u500b\u4e0d\u540c\u7684\u5217\u4e2d\u67e5\u627e\u4e0d\u91cd\u8907\u7684\u6578\u64da\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201c\u7528\u6236\u201d\u7684\u8868\u683c\uff0c\u5176\u4e2d\u5305\u542b\u201c\u96fb\u5b50\u90f5\u4ef6\u201d\u548c\u201c\u96fb\u8a71\u865f\u78bc\u201d\u5169\u5217\u3002\u6211\u5011\u5e0c\u671b\u627e\u51fa\u9019\u5169\u5217\u4e2d\u4e0d\u91cd\u8907\u7684\u6578\u64da\uff0c\u4ee5\u4fbf\u9032\u884c\u9032\u4e00\u6b65\u7684\u5206\u6790\u6216\u6e05\u7406\u3002<\/p>\n

\u4f7f\u7528SQL\u67e5\u627e\u4e0d\u91cd\u8907\u6578\u64da<\/h2>\n

\u5728SQL\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u65b9\u6cd5\u4f86\u67e5\u627e\u4e0d\u91cd\u8907\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u65b9\u6cd5\uff1a<\/p>\n

\u65b9\u6cd5\u4e00\uff1a\u4f7f\u7528UNION<\/h3>\n

UNION\u64cd\u4f5c\u7b26\u53ef\u4ee5\u7528\u4f86\u5408\u4f75\u5169\u500b\u6216\u591a\u500bSELECT\u67e5\u8a62\u7684\u7d50\u679c\uff0c\u4e26\u81ea\u52d5\u53bb\u9664\u91cd\u8907\u7684\u8a18\u9304\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n

SELECT \u96fb\u5b50\u90f5\u4ef6 AS \u4e0d\u91cd\u8907\u6578\u64da FROM \u7528\u6236\nUNION\nSELECT \u96fb\u8a71\u865f\u78bc FROM \u7528\u6236;<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u201c\u7528\u6236\u201d\u8868\u4e2d\u201c\u96fb\u5b50\u90f5\u4ef6\u201d\u548c\u201c\u96fb\u8a71\u865f\u78bc\u201d\u5169\u5217\u7684\u6240\u6709\u4e0d\u91cd\u8907\u6578\u64da\u3002<\/p>\n
\u65b9\u6cd5\u4e8c\uff1a\u4f7f\u7528LEFT JOIN\u548cIS NULL<\/h3>\n
\u53e6\u4e00\u7a2e\u65b9\u6cd5\u662f\u4f7f\u7528LEFT JOIN\u4f86\u67e5\u627e\u4e0d\u91cd\u8907\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u4ee3\u78bc\uff1a<\/p>\n
SELECT a.\u96fb\u5b50\u90f5\u4ef6\nFROM \u7528\u6236 a\nLEFT JOIN \u7528\u6236 b ON a.\u96fb\u5b50\u90f5\u4ef6 = b.\u96fb\u8a71\u865f\u78bc\nWHERE b.\u96fb\u8a71\u865f\u78bc IS NULL;<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u6240\u6709\u5728\u201c\u96fb\u5b50\u90f5\u4ef6\u201d\u5217\u4e2d\u5b58\u5728\u4f46\u5728\u201c\u96fb\u8a71\u865f\u78bc\u201d\u5217\u4e2d\u4e0d\u5b58\u5728\u7684\u6578\u64da\u3002<\/p>\n
\u65b9\u6cd5\u4e09\uff1a\u4f7f\u7528NOT IN<\/h3>\n
\u6211\u5011\u9084\u53ef\u4ee5\u4f7f\u7528NOT IN\u5b50\u53e5\u4f86\u67e5\u627e\u4e0d\u91cd\u8907\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\uff1a<\/p>\n
SELECT \u96fb\u5b50\u90f5\u4ef6\nFROM \u7528\u6236\nWHERE \u96fb\u5b50\u90f5\u4ef6 NOT IN (SELECT \u96fb\u8a71\u865f\u78bc FROM \u7528\u6236);<\/code><\/pre>\n
\u9019\u6bb5\u4ee3\u78bc\u5c07\u8fd4\u56de\u6240\u6709\u5728\u201c\u96fb\u5b50\u90f5\u4ef6\u201d\u5217\u4e2d\u5b58\u5728\u4f46\u5728\u201c\u96fb\u8a71\u865f\u78bc\u201d\u5217\u4e2d\u4e0d\u5b58\u5728\u7684\u6578\u64da\u3002<\/p>\n
\u7e3d\u7d50<\/h2>\n
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\u5982\u679c\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u6216\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u670d\u52d9\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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