{"id":183868,"date":"2024-11-10T08:24:17","date_gmt":"2024-11-10T00:24:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183868\/"},"modified":"2024-11-10T08:24:18","modified_gmt":"2024-11-10T00:24:18","slug":"%e4%bd%bf%e7%94%a8mysql%e4%b8%a6%e9%9b%86%e9%81%bf%e5%85%8d%e9%a0%86%e5%ba%8f%e5%ad%98%e5%84%b2","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183868\/","title":{"rendered":"\u4f7f\u7528MySQL\u4e26\u96c6\u907f\u514d\u9806\u5e8f\u5b58\u5132"},"content":{"rendered":"

\u4f7f\u7528MySQL\u4e26\u96c6\u907f\u514d\u9806\u5e8f\u5b58\u5132<\/h1>\n

\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cMySQL\u662f\u4e00\u500b\u5ee3\u6cdb\u4f7f\u7528\u7684\u958b\u6e90\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u3002\u5b83\u7684\u9748\u6d3b\u6027\u548c\u9ad8\u6548\u6027\u4f7f\u5176\u6210\u70ba\u8a31\u591a\u61c9\u7528\u7a0b\u5e8f\u7684\u9996\u9078\u3002\u7576\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5982\u4f55\u6709\u6548\u5730\u67e5\u8a62\u548c\u5b58\u5132\u6578\u64da\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528MySQL\u7684\u4e26\u96c6\uff08UNION\uff09\u4f86\u907f\u514d\u9806\u5e8f\u5b58\u5132\u7684\u554f\u984c\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u4e26\u96c6\uff08UNION\uff09<\/h2>\n

\u5728SQL\u4e2d\uff0c\u4e26\u96c6\u662f\u4e00\u7a2e\u64cd\u4f5c\u7b26\uff0c\u7528\u65bc\u5c07\u5169\u500b\u6216\u591a\u500bSELECT\u67e5\u8a62\u7684\u7d50\u679c\u5408\u4f75\u70ba\u4e00\u500b\u7d50\u679c\u96c6\u3002\u9019\u4e9b\u67e5\u8a62\u5fc5\u9808\u5177\u6709\u76f8\u540c\u7684\u5217\u6578\u548c\u76f8\u4f3c\u7684\u6578\u64da\u985e\u578b\u3002\u4f7f\u7528\u4e26\u96c6\u53ef\u4ee5\u6709\u6548\u5730\u6574\u5408\u4f86\u81ea\u4e0d\u540c\u8868\u6216\u67e5\u8a62\u7684\u6578\u64da\uff0c\u5f9e\u800c\u907f\u514d\u4e86\u9806\u5e8f\u5b58\u5132\u7684\u9650\u5236\u3002<\/p>\n

\u4e26\u96c6\u7684\u57fa\u672c\u8a9e\u6cd5<\/h3>\n
SELECT column1, column2 FROM table1\nUNION\nSELECT column1, column2 FROM table2;<\/code><\/pre>\n
\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u5169\u500bSELECT\u67e5\u8a62\u7684\u7d50\u679c\u5c07\u88ab\u5408\u4f75\uff0c\u4e26\u4e14\u91cd\u8907\u7684\u884c\u5c07\u88ab\u81ea\u52d5\u522a\u9664\u3002\u5982\u679c\u5e0c\u671b\u4fdd\u7559\u91cd\u8907\u7684\u884c\uff0c\u53ef\u4ee5\u4f7f\u7528UNION ALL\uff0c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
SELECT column1, column2 FROM table1\nUNION ALL\nSELECT column1, column2 FROM table2;<\/code><\/pre>\n
\u907f\u514d\u9806\u5e8f\u5b58\u5132\u7684\u5fc5\u8981\u6027<\/h2>\n
\u9806\u5e8f\u5b58\u5132\u662f\u6307\u6578\u64da\u5728\u6578\u64da\u5eab\u4e2d\u6309\u7167\u7279\u5b9a\u7684\u9806\u5e8f\u9032\u884c\u5b58\u5132\uff0c\u9019\u53ef\u80fd\u6703\u5c0e\u81f4\u67e5\u8a62\u6548\u7387\u4f4e\u4e0b\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u7576\u6578\u64da\u4ee5\u9806\u5e8f\u65b9\u5f0f\u5b58\u5132\u6642\uff0c\u67e5\u8a62\u6642\u9700\u8981\u9032\u884c\u5927\u91cf\u7684\u6383\u63cf\uff0c\u9019\u6703\u589e\u52a0I\/O\u64cd\u4f5c\u7684\u6210\u672c\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002<\/p>\n
\u4f7f\u7528\u4e26\u96c6\u53ef\u4ee5\u6709\u6548\u5730\u907f\u514d\u9019\u4e00\u554f\u984c\u3002\u901a\u904e\u5c07\u591a\u500b\u67e5\u8a62\u7684\u7d50\u679c\u5408\u4f75\uff0c\u6578\u64da\u5eab\u53ef\u4ee5\u66f4\u9748\u6d3b\u5730\u8655\u7406\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u4f8b\u5982\uff0c\u5047\u8a2d\u6709\u5169\u500b\u8868\uff0c\u5206\u5225\u5b58\u5132\u4e0d\u540c\u985e\u578b\u7684\u7528\u6236\u6578\u64da\uff0c\u4f7f\u7528\u4e26\u96c6\u53ef\u4ee5\u5feb\u901f\u7372\u53d6\u6240\u6709\u7528\u6236\u7684\u4fe1\u606f\uff0c\u800c\u4e0d\u5fc5\u64d4\u5fc3\u6578\u64da\u7684\u5b58\u5132\u9806\u5e8f\u3002<\/p>\n
\u5be6\u969b\u61c9\u7528\u6848\u4f8b<\/h2>\n
\u5047\u8a2d\u6211\u5011\u6709\u5169\u500b\u8868\uff1acustomers<\/code>\u548cvendors<\/code>\uff0c\u5b83\u5011\u90fd\u5305\u542b\u7528\u6236\u7684\u59d3\u540d\u548c\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u3002\u6211\u5011\u5e0c\u671b\u7372\u53d6\u6240\u6709\u7528\u6236\u7684\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\uff0c\u7121\u8ad6\u4ed6\u5011\u662f\u5ba2\u6236\u9084\u662f\u4f9b\u61c9\u5546\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\uff1a<\/p>\n
SELECT name, email FROM customers\nUNION\nSELECT name, email FROM vendors;<\/code><\/pre>\n
\u9019\u6a23\uff0c\u6211\u5011\u5c31\u80fd\u5920\u7372\u5f97\u4e00\u500b\u5305\u542b\u6240\u6709\u7528\u6236\u96fb\u5b50\u90f5\u4ef6\u5730\u5740\u7684\u7d50\u679c\u96c6\uff0c\u800c\u4e0d\u5fc5\u64d4\u5fc3\u6578\u64da\u7684\u5b58\u5132\u9806\u5e8f\u3002<\/p>\n
\u6027\u80fd\u8003\u91cf<\/h2>\n
\u96d6\u7136\u4f7f\u7528\u4e26\u96c6\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\uff0c\u4f46\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u904e\u591a\u7684\u4e26\u96c6\u64cd\u4f5c\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u4e0b\u964d\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u975e\u5e38\u5927\u7684\u6578\u64da\u96c6\u6642\uff0c\u5efa\u8b70\u5c0d\u67e5\u8a62\u9032\u884c\u512a\u5316\uff0c\u4f8b\u5982\u4f7f\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\u904e\u7a0b\u3002\u6b64\u5916\uff0c\u61c9\u6839\u64da\u5be6\u969b\u9700\u6c42\u9078\u64c7\u4f7f\u7528UNION\u9084\u662fUNION ALL\uff0c\u4ee5\u5e73\u8861\u6027\u80fd\u548c\u6578\u64da\u5b8c\u6574\u6027\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
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\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u9ad8\u6548\u67e5\u8a62\u7684\u8cc7\u8a0a\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u7372\u53d6\u66f4\u591a\u6709\u95dc\u9999\u6e2fVPS<\/a>\u548c\u4f3a\u670d\u5668<\/a>\u7684\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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