{"id":185306,"date":"2024-11-10T20:27:16","date_gmt":"2024-11-10T12:27:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185306\/"},"modified":"2024-11-10T20:27:17","modified_gmt":"2024-11-10T12:27:17","slug":"%e4%bd%bf%e7%94%a8sql%e4%b8%adselect%e8%aa%9e%e5%8f%a5%e7%9a%84%e4%bd%bf%e7%94%a8%e6%a2%9d%e4%bb%b6%e9%82%8f%e8%bc%af","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185306\/","title":{"rendered":"\u4f7f\u7528SQL\u4e2dSELECT\u8a9e\u53e5\u7684\u4f7f\u7528\u689d\u4ef6\u908f\u8f2f"},"content":{"rendered":"

\u4f7f\u7528SQL\u4e2dSELECT\u8a9e\u53e5\u7684\u4f7f\u7528\u689d\u4ef6\u908f\u8f2f<\/h1>\n

\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0cSQL\uff08\u7d50\u69cb\u5316\u67e5\u8a62\u8a9e\u8a00\uff09\u662f\u4e00\u7a2e\u7528\u65bc\u67e5\u8a62\u548c\u64cd\u4f5c\u8cc7\u6599\u7684\u6a19\u6e96\u8a9e\u8a00\u3002SELECT\u8a9e\u53e5\u662fSQL\u4e2d\u6700\u5e38\u7528\u7684\u8a9e\u53e5\u4e4b\u4e00\uff0c\u4e3b\u8981\u7528\u65bc\u5f9e\u8cc7\u6599\u8868\u4e2d\u6aa2\u7d22\u8cc7\u6599\u3002\u70ba\u4e86\u63d0\u9ad8\u67e5\u8a62\u7684\u9748\u6d3b\u6027\u548c\u6548\u7387\uff0c\u4f7f\u7528\u689d\u4ef6\u908f\u8f2f\u4f86\u904e\u6ffe\u548c\u9078\u64c7\u8cc7\u6599\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5728SQL\u4e2d\u4f7f\u7528SELECT\u8a9e\u53e5\u7684\u689d\u4ef6\u908f\u8f2f\uff0c\u5305\u62ecWHERE\u5b50\u53e5\u3001AND\u3001OR\u3001NOT\u7b49\u904b\u7b97\u7b26\u7684\u4f7f\u7528\u3002<\/p>\n

\u57fa\u672c\u7684SELECT\u8a9e\u53e5<\/h2>\n

SELECT\u8a9e\u53e5\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n

SELECT column1, column2, ...\nFROM table_name;<\/code><\/pre>\n
\u9019\u88e1\uff0ccolumn1\u548ccolumn2\u662f\u8981\u6aa2\u7d22\u7684\u6b04\u4f4d\u540d\u7a31\uff0ctable_name\u662f\u8cc7\u6599\u8868\u7684\u540d\u7a31\u3002\u8209\u4f8b\u4f86\u8aaa\uff0c\u5982\u679c\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba\u201cemployees\u201d\u7684\u8cc7\u6599\u8868\uff0c\u4e26\u5e0c\u671b\u6aa2\u7d22\u6240\u6709\u54e1\u5de5\u7684\u59d3\u540d\u548c\u8077\u4f4d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n
SELECT name, position\nFROM employees;<\/code><\/pre>\n
\u4f7f\u7528WHERE\u5b50\u53e5\u9032\u884c\u689d\u4ef6\u904e\u6ffe<\/h2>\n
\u5728\u5be6\u969b\u61c9\u7528\u4e2d\uff0c\u6211\u5011\u7d93\u5e38\u9700\u8981\u6839\u64da\u7279\u5b9a\u689d\u4ef6\u4f86\u904e\u6ffe\u8cc7\u6599\u3002\u9019\u6642\uff0cWHERE\u5b50\u53e5\u5c31\u6d3e\u4e0a\u7528\u5834\u4e86\u3002WHERE\u5b50\u53e5\u7528\u65bc\u6307\u5b9a\u67e5\u8a62\u7684\u689d\u4ef6\uff0c\u53ea\u6709\u6eff\u8db3\u689d\u4ef6\u7684\u8cc7\u6599\u624d\u6703\u88ab\u6aa2\u7d22\u51fa\u4f86\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u53ea\u60f3\u6aa2\u7d22\u8077\u4f4d\u70ba\u201cManager\u201d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT name, position\nFROM employees\nWHERE position = 'Manager';<\/code><\/pre>\n
\u4f7f\u7528AND\u548cOR\u904b\u7b97\u7b26<\/h2>\n
\u5728WHERE\u5b50\u53e5\u4e2d\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528AND\u548cOR\u904b\u7b97\u7b26\u4f86\u7d44\u5408\u591a\u500b\u689d\u4ef6\u3002AND\u904b\u7b97\u7b26\u8981\u6c42\u6240\u6709\u689d\u4ef6\u90fd\u5fc5\u9808\u6eff\u8db3\uff0c\u800cOR\u904b\u7b97\u7b26\u5247\u53ea\u9700\u6eff\u8db3\u5176\u4e2d\u4e00\u500b\u689d\u4ef6\u3002<\/p>\n
\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u6aa2\u7d22\u8077\u4f4d\u70ba\u201cManager\u201d\u4e14\u5e74\u9f61\u5927\u65bc30\u6b72\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528AND\u904b\u7b97\u7b26\uff1a<\/p>\n
SELECT name, position\nFROM employees\nWHERE position = 'Manager' AND age > 30;<\/code><\/pre>\n
\u76f8\u53cd\uff0c\u5982\u679c\u6211\u5011\u60f3\u6aa2\u7d22\u8077\u4f4d\u70ba\u201cManager\u201d\u6216\u201cDeveloper\u201d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528OR\u904b\u7b97\u7b26\uff1a<\/p>\n
SELECT name, position\nFROM employees\nWHERE position = 'Manager' OR position = 'Developer';<\/code><\/pre>\n
\u4f7f\u7528NOT\u904b\u7b97\u7b26<\/h2>\n
NOT\u904b\u7b97\u7b26\u7528\u65bc\u6392\u9664\u67d0\u4e9b\u689d\u4ef6\u3002\u9019\u5728\u9700\u8981\u6392\u9664\u7279\u5b9a\u8cc7\u6599\u6642\u975e\u5e38\u6709\u7528\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u6aa2\u7d22\u6240\u6709\u4e0d\u662f\u201cIntern\u201d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT name, position\nFROM employees\nWHERE NOT position = 'Intern';<\/code><\/pre>\n
\u4f7f\u7528IN\u548cBETWEEN\u904b\u7b97\u7b26<\/h2>\n
IN\u904b\u7b97\u7b26\u5141\u8a31\u6211\u5011\u6307\u5b9a\u4e00\u7d44\u503c\uff0c\u67e5\u8a62\u6642\u53ea\u9700\u6eff\u8db3\u9019\u4e9b\u503c\u4e2d\u7684\u4e00\u500b\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u6aa2\u7d22\u8077\u4f4d\u70ba\u201cManager\u201d\u3001\u201cDeveloper\u201d\u6216\u201cDesigner\u201d\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u4f7f\u7528IN\u904b\u7b97\u7b26\uff1a<\/p>\n
SELECT name, position\nFROM employees\nWHERE position IN ('Manager', 'Developer', 'Designer');<\/code><\/pre>\n
BETWEEN\u904b\u7b97\u7b26\u5247\u7528\u65bc\u67e5\u8a62\u67d0\u500b\u7bc4\u570d\u5167\u7684\u503c\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u60f3\u6aa2\u7d22\u5e74\u9f61\u572825\u523035\u6b72\u4e4b\u9593\u7684\u54e1\u5de5\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n
SELECT name, age\nFROM employees\nWHERE age BETWEEN 25 AND 35;<\/code><\/pre>\n
\u7e3d\u7d50<\/h2>\n
\u5728SQL\u4e2d\uff0c\u4f7f\u7528SELECT\u8a9e\u53e5\u7684\u689d\u4ef6\u908f\u8f2f\u662f\u8cc7\u6599\u6aa2\u7d22\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u901a\u904e\u4f7f\u7528WHERE\u5b50\u53e5\u3001AND\u3001OR\u3001NOT\u3001IN\u548cBETWEEN\u7b49\u904b\u7b97\u7b26\uff0c\u6211\u5011\u53ef\u4ee5\u9748\u6d3b\u5730\u904e\u6ffe\u548c\u9078\u64c7\u6240\u9700\u7684\u8cc7\u6599\u3002\u9019\u4e9b\u6280\u8853\u4e0d\u50c5\u63d0\u9ad8\u4e86\u67e5\u8a62\u7684\u6548\u7387\uff0c\u9084\u4f7f\u5f97\u8cc7\u6599\u5206\u6790\u8b8a\u5f97\u66f4\u52a0\u7cbe\u78ba\u3002<\/p>\n
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