{"id":183464,"date":"2024-11-10T05:02:20","date_gmt":"2024-11-09T21:02:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/183464\/"},"modified":"2024-11-10T05:02:21","modified_gmt":"2024-11-09T21:02:21","slug":"%e5%af%a6%e7%94%a8%e6%8a%80%e5%b7%a7%ef%bc%9a%e6%95%b8%e6%93%9a%e5%ba%ab%e6%a2%9d%e4%bb%b6%e6%9f%a5%e8%a9%a2%e6%93%8d%e4%bd%9c%e6%96%b9%e6%b3%95-%e6%95%b8%e6%93%9a%e5%ba%ab%e6%80%8e%e9%ba%bc%e6%9c%89","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/183464\/","title":{"rendered":"\u5be6\u7528\u6280\u5de7\uff1a\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\u64cd\u4f5c\u65b9\u6cd5 (\u6578\u64da\u5eab\u600e\u9ebc\u6709\u689d\u4ef6\u7684\u67e5\u8a62)"},"content":{"rendered":"

\u5be6\u7528\u6280\u5de7\uff1a\u6578\u64da\u5eab\u689d\u4ef6\u67e5\u8a62\u64cd\u4f5c\u65b9\u6cd5<\/h1>\n

\u5728\u73fe\u4eca\u7684\u6578\u64da\u9a45\u52d5\u6642\u4ee3\uff0c\u6578\u64da\u5eab\u7684\u4f7f\u7528\u5df2\u6210\u70ba\u5404\u884c\u5404\u696d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u7121\u8ad6\u662f\u4f01\u696d\u7ba1\u7406\u3001\u96fb\u5b50\u5546\u52d9\u9084\u662f\u793e\u4ea4\u5a92\u9ad4\uff0c\u6578\u64da\u5eab\u90fd\u626e\u6f14\u8457\u95dc\u9375\u89d2\u8272\u3002\u800c\u5728\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\uff0c\u689d\u4ef6\u67e5\u8a62\u662f\u6700\u5e38\u898b\u4e14\u6700\u91cd\u8981\u7684\u64cd\u4f5c\u4e4b\u4e00\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e\u6578\u64da\u5eab\u7684\u689d\u4ef6\u67e5\u8a62\u64cd\u4f5c\u65b9\u6cd5\uff0c\u5e6b\u52a9\u8b80\u8005\u66f4\u597d\u5730\u7406\u89e3\u548c\u61c9\u7528\u9019\u4e00\u6280\u8853\u3002<\/p>\n

\u4ec0\u9ebc\u662f\u689d\u4ef6\u67e5\u8a62\uff1f<\/h2>\n

\u689d\u4ef6\u67e5\u8a62\u662f\u6307\u5728\u6578\u64da\u5eab\u4e2d\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u6aa2\u7d22\u6578\u64da\u7684\u904e\u7a0b\u3002\u9019\u4e9b\u689d\u4ef6\u53ef\u4ee5\u662f\u6578\u64da\u7684\u67d0\u4e9b\u5c6c\u6027\u6216\u503c\uff0c\u901a\u904e\u9019\u4e9b\u689d\u4ef6\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u7cbe\u78ba\u5730\u7372\u53d6\u6240\u9700\u7684\u4fe1\u606f\u3002\u689d\u4ef6\u67e5\u8a62\u901a\u5e38\u4f7f\u7528SQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u4f86\u5be6\u73fe\uff0c\u9019\u662f\u4e00\u7a2e\u5c08\u9580\u7528\u65bc\u7ba1\u7406\u548c\u64cd\u4f5c\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7684\u8a9e\u8a00\u3002<\/p>\n

\u57fa\u672c\u7684SQL\u67e5\u8a62\u8a9e\u6cd5<\/h2>\n

\u5728\u9032\u884c\u689d\u4ef6\u67e5\u8a62\u6642\uff0c\u6700\u57fa\u672c\u7684SQL\u8a9e\u6cd5\u70ba\uff1a<\/p>\n

SELECT column1, column2, ...\nFROM table_name\nWHERE condition;<\/code><\/pre>\n
\u5728\u9019\u88e1\uff0cSELECT<\/code>\u8a9e\u53e5\u7528\u65bc\u6307\u5b9a\u8981\u6aa2\u7d22\u7684\u5217\uff0cFROM<\/code>\u8a9e\u53e5\u7528\u65bc\u6307\u5b9a\u6578\u64da\u4f86\u6e90\u7684\u8868\uff0cWHERE<\/code>\u8a9e\u53e5\u5247\u7528\u65bc\u8a2d\u7f6e\u67e5\u8a62\u7684\u689d\u4ef6\u3002<\/p>\n
\u4f7f\u7528WHERE\u5b50\u53e5\u9032\u884c\u689d\u4ef6\u67e5\u8a62<\/h2>\n
\u5728SQL\u4e2d\uff0cWHERE<\/code>\u5b50\u53e5\u662f\u9032\u884c\u689d\u4ef6\u67e5\u8a62\u7684\u6838\u5fc3\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u689d\u4ef6\u67e5\u8a62\u793a\u4f8b\uff1a<\/p>\n
1. \u57fa\u672c\u689d\u4ef6\u67e5\u8a62<\/h3>\n
\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70baemployees<\/code>\u7684\u8868\uff0c\u5305\u542b\u54e1\u5de5\u7684\u59d3\u540d\u548c\u5e74\u9f61\u3002\u82e5\u8981\u67e5\u8a62\u5e74\u9f61\u5927\u65bc30\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\uff1a<\/p>\n
SELECT * FROM employees\nWHERE age > 30;<\/code><\/pre>\n
2. \u591a\u91cd\u689d\u4ef6\u67e5\u8a62<\/h3>\n
\u6709\u6642\u5019\uff0c\u6211\u5011\u9700\u8981\u6839\u64da\u591a\u500b\u689d\u4ef6\u9032\u884c\u67e5\u8a62\u3002\u9019\u6642\u53ef\u4ee5\u4f7f\u7528AND<\/code>\u548cOR<\/code>\u904b\u7b97\u7b26\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u5e74\u9f61\u5927\u65bc30\u4e14\u90e8\u9580\u70ba\u201c\u92b7\u552e\u201d\u7684\u54e1\u5de5\uff1a<\/p>\n
SELECT * FROM employees\nWHERE age > 30 AND department = 'Sales';<\/code><\/pre>\n
3. \u4f7f\u7528LIKE\u9032\u884c\u6a21\u7cca\u67e5\u8a62<\/h3>\n
\u5982\u679c\u9700\u8981\u9032\u884c\u6a21\u7cca\u67e5\u8a62\uff0c\u53ef\u4ee5\u4f7f\u7528LIKE<\/code>\u904b\u7b97\u7b26\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u59d3\u540d\u4e2d\u5305\u542b\u201cJohn\u201d\u7684\u6240\u6709\u54e1\u5de5\uff1a<\/p>\n
SELECT * FROM employees\nWHERE name LIKE '%John%';<\/code><\/pre>\n
4. \u4f7f\u7528IN\u9032\u884c\u591a\u503c\u67e5\u8a62<\/h3>\n
\u7576\u9700\u8981\u67e5\u8a62\u67d0\u4e00\u5217\u4e2d\u5305\u542b\u591a\u500b\u7279\u5b9a\u503c\u7684\u8a18\u9304\u6642\uff0c\u53ef\u4ee5\u4f7f\u7528IN<\/code>\u904b\u7b97\u7b26\u3002\u4f8b\u5982\uff0c\u67e5\u8a62\u90e8\u9580\u70ba\u201c\u92b7\u552e\u201d\u6216\u201c\u5e02\u5834\u201d\u7684\u54e1\u5de5\uff1a<\/p>\n
SELECT * FROM employees\nWHERE department IN ('Sales', 'Marketing');<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u689d\u4ef6\u67e5\u8a62\u662f\u6578\u64da\u5eab\u64cd\u4f5c\u4e2d\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\uff0c\u638c\u63e1\u5176\u57fa\u672c\u8a9e\u6cd5\u548c\u4f7f\u7528\u65b9\u6cd5\u5c0d\u65bc\u6578\u64da\u7ba1\u7406\u81f3\u95dc\u91cd\u8981\u3002\u901a\u904e\u4f7f\u7528WHERE<\/code>\u5b50\u53e5\u53ca\u5176\u76f8\u95dc\u904b\u7b97\u7b26\uff0c\u4f7f\u7528\u8005\u53ef\u4ee5\u9748\u6d3b\u5730\u6aa2\u7d22\u6240\u9700\u7684\u6578\u64da\uff0c\u5f9e\u800c\u63d0\u9ad8\u5de5\u4f5c\u6548\u7387\u3002<\/p>\n
\u5982\u679c\u60a8\u5c0d\u65bc\u6578\u64da\u5eab\u7684\u4f7f\u7528\u6709\u66f4\u9ad8\u7684\u9700\u6c42\uff0c\u8003\u616e\u4f7f\u7528\u9999\u6e2fVPS<\/a>\u6216\u4e91\u670d\u52a1\u5668<\/a>\u4f86\u642d\u5efa\u60a8\u7684\u6578\u64da\u5eab\u74b0\u5883\uff0c\u9019\u5c07\u70ba\u60a8\u7684\u696d\u52d9\u63d0\u4f9b\u66f4\u5f37\u5927\u7684\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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