{"id":111597,"date":"2026-10-01T11:22:31","date_gmt":"2026-10-01T03:22:31","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/111597.html"},"modified":"2026-10-01T11:22:31","modified_gmt":"2026-10-01T03:22:31","slug":"mysql%e5%a4%8d%e5%90%88%e6%9f%a5%e8%af%a2-2","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/111597.html","title":{"rendered":"MySQL\u590d\u5408\u67e5\u8be2"},"content":{"rendered":"

\n

\"\" <\/p>\n

@bit::Shadow
\n \u2727(\u2256 \u25e1 \u2256\u273f\u00a0<\/p>\n

\u76ee\u5f55<\/p>\n

\u57fa\u672c\u67e5\u8be2<\/p>\n

\u603b\u7ed3<\/p>\n

\u987a\u5e8f<\/p>\n

\u77e5\u8bc6\u70b9\u57fa\u7840<\/p>\n

\u591a\u8868\u67e5\u8be2<\/p>\n

\u591a\u8868\u67e5\u8be2<\/p>\n

\u7b1b\u5361\u5c14\u79ef<\/p>\n

\u663e\u793a\u90e8\u95e8\u53f7\u4e3a10\u7684\u90e8\u95e8\u540d，\u5458\u5de5\u540d\u548c\u5de5\u8d44<\/p>\n

\u663e\u793a\u5404\u4e2a\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u53ca\u5de5\u8d44\u7ea7\u522b<\/p>\n

\u603b\u7ed3<\/p>\n

\u5b50\u67e5\u8be2<\/p>\n

\u5355\u884c\u5b50\u67e5\u8be2<\/p>\n

\u591a\u884c\u5b50\u67e5\u8be2<\/p>\n

in\u7684\u4f7f\u7528<\/p>\n

all\u7684\u4f7f\u7528<\/p>\n

any\u7684\u4f7f\u7528<\/p>\n

\u95ee\u9898<\/p>\n

\u591a\u5217\u5b50\u67e5\u8be2<\/p>\n

\u5728from\u5b50\u53e5\u4e2d\u4f7f\u7528\u5b50\u67e5\u8be2<\/p>\n

*\u5408\u5e76\u67e5\u8be2union [all]<\/p>\n

\n

\u672c\u6587\u7cfb\u7edf\u8bb2\u89e3\u591a\u8868\u67e5\u8be2\u6838\u5fc3\u6982\u5ff5，\u6db5\u76d6\u7b1b\u5361\u5c14\u79ef\u3001\u8fde\u8868\u67e5\u8be2\u3001\u5b50\u67e5\u8be2（\u5355\u884c\u3001\u591a\u884c\u3001\u591a\u5217）\u53caALL\/ANY\u4e0eMIN\/MAX\u7684\u7b49\u4ef7\u5173\u7cfb，\u5f3a\u8c03\u5faa\u5e8f\u6e10\u8fdb\u7684\u67e5\u8be2\u8bbe\u8ba1\u601d\u8def\u3002\u901a\u8fc7\u5b9e\u4f8b\u6f14\u793a\u90e8\u95e8\u4e0e\u5458\u5de5\u4fe1\u606f\u5173\u8054\u3001\u5de5\u8d44\u6bd4\u8f83\u3001\u5e73\u5747\u5de5\u8d44\u7b5b\u9009\u7b49\u573a\u666f，\u5e76\u4ecb\u7ecdUNION\u4e0eUNION ALL\u5408\u5e76\u7ed3\u679c\u96c6\u7684\u7528\u6cd5，\u9002\u7528\u4e8eSQL\u8fdb\u9636\u5b66\u4e60\u8005\u3002<\/p>\n

\u57fa\u672c\u67e5\u8be2<\/h2>\n

1.\u67e5\u8be2\u5de5\u8d44\u9ad8\u4e8e500\u6216\u5c97\u4f4d\u4e3aMANAGER\u7684\u96c7\u5458，\u540c\u65f6\u8fd8\u8981\u6ee1\u8db3\u4ed6\u4eec\u7684\u59d3\u540d\u9996\u5b57\u6bcd\u4e3a\u5927\u5199\u7684J<\/p>\n

\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u5355\u4f4d\u662f\u201c\u96c7\u5458\u201d，\u672a\u5206\u7ec4 — \u4f7f\u7528where\u9650\u5b9a<\/p>\n

\"\"<\/p>\n

2.\u6309\u7167\u90e8\u95e8\u53f7\u5347\u5e8f\u800c\u96c7\u5458\u7684\u5de5\u8d44\u964d\u5e8f\u6392\u5e8f<\/p>\n

\u5355\u4f4d\u662f\u96c7\u5458<\/p>\n

\u62e5\u6709\u6392\u5e8f\u8981\u6c42（\u6ce8\u610f：\u591a\u6392\u5e8f\u9650\u5b9a\u6761\u4ef6\u4f7f\u7528\u201c ,<\/span> \u201d\u9694\u5f00\u800c\u4e0d\u662for and\u4ec0\u4e48\u7684）<\/p>\n

\"\"<\/p>\n

3.\u4f7f\u7528\u5e74\u85aa\u8fdb\u884c\u964d\u5e8f\u6392\u5e8f<\/p>\n

\u5355\u4f4d\u662f\u96c7\u5458<\/p>\n

\u964d\u5e8f\u8981\u6c42<\/p>\n

\u201c\u5e74\u85aa\u201d\u7684\u6784\u6210\u5206\u6790：\u6708\u85aa*12+\u5956\u91d1（comm）<\/p>\n

\"\"<\/p>\n

3.\u663e\u793a\u5de5\u8d44\u6700\u9ad8\u7684\u5458\u5de5\u7684\u540d\u5b57\u548c\u5de5\u4f5c\u5c97\u4f4d<\/p>\n

\u4e24\u79cd\u89e3\u6cd5<\/p>\n

1.\u201c\u5de5\u8d44\u6700\u9ad8\u201d\u672c\u8eab\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u67e5\u8be2\u7684\u8fd4\u56de\u7ed3\u679c（\u8868）\u3002<\/p>\n

2.order\u6392\u5e8f+limit\u9650\u5b9a<\/p>\n

\"\"<\/p>\n

4.\u663e\u793a\u5de5\u8d44\u9ad8\u4e8e\u5e73\u5747\u5de5\u8d44\u7684\u5458\u5de5\u4fe1\u606f<\/p>\n

\u201c\u5e73\u5747\u5de5\u8d44\u201d\u672c\u8eab\u5c31\u53ef\u4ee5\u4f5c\u4e3a\u4e00\u4e2a\u67e5\u8be2\u7684\u8fd4\u56de\u7ed3\u679c（\u8868）\u3002<\/p>\n

\"\"<\/p>\n

5.\u663e\u793a\u6bcf\u4e2a\u90e8\u95e8\u7684\u5e73\u5747\u5de5\u8d44\u4e0e\u6700\u9ad8\u5de5\u8d44<\/p>\n

\u201c\u90e8\u95e8\u201d\u4f5c\u4e3a\u5355\u4f4d\u3002<\/p>\n

\"\"<\/p>\n

6.\u663e\u793a\u5e73\u5747\u5de5\u8d44\u4f4e\u4e8e2000\u7684\u90e8\u95e8\u53f7\u548c\u5b83\u7684\u5e73\u5747\u5de5\u8d44<\/p>\n

\u201c\u90e8\u95e8\u201d\u662f\u5355\u4f4d\u3002<\/p>\n

\u9650\u5b9a\u7684\u201c\u5e73\u5747\u5de5\u8d44\u201d\u540c\u6837\u662f\u90e8\u95e8\u3002（having）<\/span><\/p>\n

\"\"<\/p>\n

7.\u663e\u793a\u6bcf\u79cd\u5c97\u4f4d\u7684\u96c7\u5458\u603b\u6570，\u5e73\u5747\u5de5\u8d44<\/p>\n

\u201c\u805a\u5408\u201d\u4f5c\u4e3a\u5206\u7c7b\u4f9d\u636e\u7684\u4e0b\u4e00\u5355\u4f4d\u3002（\u50cf：\u5e73\u5747\u5de5\u8d44\u7edf\u8ba1\u7684\u662f\u540c\u4e00\u7c7bjob\u4e0b\u6bcf\u4e2a\u4eba<\/span>）<\/p>\n

\"\"<\/p>\n

\n

\u603b\u7ed3<\/h3>\n

\u987a\u5e8f<\/h4>\n
  • from —<\/li>\n
  • \u5355\u4f4d\u662f\u4ec0\u4e48（\u5355\u4eba\/\u5c97\u4f4d\/）+ \u9700\u6c42\u5355\u4f4d（\u6700\u9ad8\u3001\u5e73\u5747\u3001\u6700\u4f4e\u3001\u5927\u4e8e\u3001\u7b49\u4e8e）–<\/li>\n
  • where\/group\/order\/ —\u00a0<\/li>\n
  • select \u8f93\u51fa\u8981\u6c42<\/li>\n

    \u77e5\u8bc6\u70b9\u57fa\u7840<\/h4>\n

    1.\u6267\u884c\u987a\u5e8f\u7262\u8bb0（\u91cd\u70b9\u5728select\u4e0ehaving\u7684\u6267\u884c\u4f18\u5148\u7ea7—\u805a\u5408\u51fd\u6570\u7684\u6267\u884c）<\/p>\n

    \"\"<\/p>\n

    2.MySQL\u5185\u7f6e\u51fd\u6570（\u8f83\u6b21\u8981）<\/p>\n

    \u2460\u7528\u6cd5\u57fa\u7840<\/p>\n

    \u2461\u7279\u8272\u51fd\u6570 like\u00a0 isnull\u00a0 format\u00a0 replace<\/p>\n

    like\u7528\u6cd5：<\/p>\n

    SELECT \u5217 FROM \u8868 WHERE \u5217 LIKE '\u6a21\u5f0f'; <\/p>\n

    \n

    \u591a\u8868\u67e5\u8be2<\/h2>\n

    \u77e5\u8bc6\u70b9\u57fa\u7840：<\/p>\n

    1.from t1, t2 — \u7b1b\u5361\u5c14\u79ef \u590d\u5408\u8868\u67e5\u8be2\u57fa\u7840<\/p>\n

    2. t1.col_1\u00a0 \u00a0— \u5bf9\u4e8e\u591a\u8868\u590d\u5408\u540e\u5217\u540d\u5b57\u51b2\u7a81\u4f7f\u7528\u7684' . '\u8bbf\u95ee\u5f62\u5f0f<\/p>\n

    3.\u5b50\u67e5\u8be2\u2014\u2014\u9762\u5bf9\u590d\u6742\u9700\u6c42\u6211\u4eec\u5e94\u5206\u89e3\u9700\u6c42\u5148\u63d0\u53d6\u4e2d\u5fc3\u50cf：<\/p>\n

    \"\"<\/p>\n

    4.\u591a\u884c\u5b50\u67e5\u8be2\u4e2d\u2014\u2014in\u00a0 all\u00a0 any\u00a0 \u4e0ewhere\u7684\u914d\u5408\u4f7f\u7528<\/p>\n

    *5.\u600e\u4e48\u770b\u5f85any\/all\u5bf9\u4e8emin\/max\u66ff\u4ee3\u65b9\u6848\u3002<\/p>\n<\/p>\n

    \u591a\u8868\u67e5\u8be2<\/h2>\n

    \u7b1b\u5361\u5c14\u79ef<\/h3>\n

    \u4e24\/\u591a\u8868\u5171\u540c\u67e5\u8be2\u7684\u57fa\u7840\u662f\u901a\u8fc7\u201c\u7b1b\u5361\u5c14\u79ef\u201d\u5f62\u6210\u7684\u4e00\u4e2a\u590d\u5408\u8868\u3002<\/p>\n

    \u7b1b\u5361\u5c14\u79ef\u7684\u672c\u8d28\u662f\u4e24\u5f20\u8868\u7684\u6392\u5217\u7ec4\u5408\u3002<\/p>\n

    \u7b1b\u5361\u5c14\u79ef\u56fe\u793a<\/p>\n

    \"\"<\/p>\n

    \u663e\u793a\u90e8\u95e8\u53f7\u4e3a<\/span>10<\/span>\u7684\u90e8\u95e8\u540d，\u5458\u5de5\u540d\u548c\u5de5\u8d44<\/span><\/h3>\n

    \u6709\u6548\u7684\u7b1b\u5361\u5c14\u79ef<\/p>\n

    \"\"<\/p>\n

    \u4ec510\u53f7\u90e8\u95e8\u53f7<\/p>\n

    \"\"<\/p>\n

    \u6ce8\u610f：\u4e0d\u80fd\u8fde\u7528\u2018=\u2019\u3002<\/p>\n

    select * from emp,dept where emp.deptno=dept.deptno=10; <\/p>\n

    \u56e0\u4e3aMySQL\u5185=\u662f\u5de6\u7ed3\u5408\u7684<\/p>\n

    \"\"<\/p>\n

    \u6700\u7ec8\u7248<\/p>\n

    \u6ce8\u610f：\u2018dept.\u2019\u7684\u524d\u7f00\u662f\u5426\u52a0\u53d6\u51b3\u4e8e\u591a\u8868\u590d\u5408\u540e\u662f\u5426\u5b58\u5728\u5217\u540d\u5b57\u91cd\u590d<\/span><\/p>\n

    mysql> select
    \n -> dept.dname '\u90e8\u95e8\u540d',emp.ename '\u5458\u5de5\u540d',emp.sal '\u5de5\u8d44'
    \n -> from emp,dept
    \n -> where emp.deptno=dept.deptno and emp.deptno=10
    \n -> ;<\/p>\n

    \"\"<\/p>\n

    \u663e\u793a\u5404\u4e2a\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u53ca\u5de5\u8d44\u7ea7\u522b<\/h3>\n

    1.\u590d\u5408\u5458\u5de5\u8868\u4e0e\u5de5\u8d44\u8868<\/p>\n

    \"\"<\/p>\n

    2.\u5b9a\u5411\u67e5\u8be2<\/p>\n

    \"\"<\/p>\n

    \u603b\u7ed3<\/h3>\n

    \u591a\u8868\u67e5\u8be2\u5373\u590d\u5408\u591a\u4e2a\u8868（from t1,t2）\u4ee5\u5355\u8868\u7684\u201c\u57fa\u672c\u67e5\u8be2\u201d\u4e3a\u57fa\u7840\u8fdb\u884c\u67e5\u8be2\u3002<\/p>\n

    \u7531\u4e8e\u9700\u6c42\u8f83\u4e3a\u590d\u6742\u5e38\u5e38\u91c7\u7528\u5faa\u5e8f\u6e10\u8fdb\u7684\u65b9\u6cd5\u5206\u89e3\u4e3b\u9700\u6c42\u540e\u9010\u6e10\u903c\u8fd1\u4e3b\u9700\u6c42<\/span>\u786e\u4fdd\u6bcf\u6b65\u67e5\u8be2\u90fd\u662f\u7b26\u5408\u9884\u671f\u7684<\/p>\n

    \u5b50\u67e5\u8be2<\/h2>\n

    \u5b50\u67e5\u8be2\u662f\u6307\u5d4c\u5957\u5728\u4e00\u6761sql\u8bed\u53e5\u4e2d\u7684\u591a\u4e2aselect\u6784\u6210\u7684\u67e5\u8be2\u6a21\u5f0f\u3002<\/p>\n

    \u5355\u884c\u5b50\u67e5\u8be2<\/h3>\n

    \u6307\u4e00\u4e2a\u67e5\u8be2\u5185\u62e5\u6709\u5b50\u67e5\u8be2，\u6b64\u5b50\u67e5\u8be2\u8fd4\u8fd8\u5355\u884c\u3001\u5355\u5217<\/span><\/span>\u5145\u5f53\u67e5\u8be2\u7684\u4f9d\u636e\u3002<\/p>\n

    \u663e\u793a\u00a0\u4e0eSMITH\u540c\u4e00\u90e8\u95e8\u00a0\u7684\u00a0\u5458\u5de5<\/p>\n

    \"\"<\/p>\n

    \u591a\u884c\u5b50\u67e5\u8be2<\/h3>\n

    \u6307\u4e00\u4e2a\u67e5\u8be2\u5185\u62e5\u6709\u5b50\u67e5\u8be2，\u6b64\u5b50\u67e5\u8be2\u8fd4\u8fd8\u5355\u5217\u3001\u591a\u884c<\/span><\/span>\u7ed3\u679c\u5145\u5f53\u67e5\u8be2\u7684\u4f9d\u636e\u3002<\/p>\n

    in\u7684\u4f7f\u7528<\/h4>\n

    \u9488\u5bf9\u4e8e\u201c\u5355\u5217\u3001\u591a\u884c<\/span><\/span>\u201d\u7684\u8fd4\u56de\u7ed3\u679c<\/p>\n

    in\u5173\u952e\u5b57；\u67e5\u8be2\u548c10\u53f7\u90e8\u95e8\u7684\u5de5\u4f5c\u5c97\u4f4d\u76f8\u540c\u7684\u96c7\u5458\u7684\u540d\u5b57，\u5c97\u4f4d，\u5de5\u8d44，\u90e8\u95e8\u53f7，\u4f46\u662f\u4e0d\u5305\u542b10\u90e8\u95e8\u81ea\u5df1\u7684\u4eba (\u5047\u8bbe10\u53f7\u90e8\u95e8\u7684\u6240\u6709\u5c97\u4f4d\u90fd\u6709\u4eba)<\/p>\n

    \u5341\u53f7\u90e8\u95e8\u7684\u6240\u6709\u5c97\u4f4d\u7c7b\u578b<\/p>\n

    \"\"<\/p>\n

    \u4f7f\u7528where job in (select . . .) — \u591a\u884c\u5b50\u67e5\u8be2\u9650\u5b9a<\/p>\n

    \"\"<\/p>\n

    \n

    all\u7684\u4f7f\u7528<\/h4>\n

    \u9488\u5bf9\u7684\u201c\u5355\u5217\u3001\u591a\u884c\u201d\u7684\u5b50\u67e5\u8be2\u7ed3\u679c（\u8868）<\/p>\n

    — all\u5173\u952e\u5b57；\u663e\u793a\u5de5\u8d44\u6bd4\u90e8\u95e830\u7684\u6240\u6709\u5458\u5de5\u7684\u5de5\u8d44\u9ad8\u7684\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u548c\u90e8\u95e8\u53f7 (\u9700\u6c42\u5176\u5b9e\u5c31\u662f\u6700\u9ad8) \u3002<\/p>\n

    \u90e8\u95e830\u7684\u6240\u6709\u5458\u5de5\u7684\u5de5\u8d44<\/p>\n

    \"\"<\/p>\n

    \u4f7f\u7528where sal>all(select . . .)\u9650\u5b9a\u201c\u6bd4\u6240\u6709. . .\u9ad8\u201d\u7684\u9700\u6c42<\/p>\n

    \"\"<\/p>\n

    \n

    any\u7684\u4f7f\u7528<\/h4>\n

    — any\u5173\u952e\u5b57；\u663e\u793a\u5de5\u8d44\u6bd4\u90e8\u95e8\u53f730\u7684\u4efb\u610f\u5458\u5de5\u7684\u5de5\u8d44\u9ad8\u7684\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u548c\u90e8\u95e8\u53f7（\u5305\u542b\u81ea\u5df1\u90e8\u95e8\u7684\u5458\u5de5） \u76f8\u5f53\u4e8e\u6570\u5b66\u4e2d\u7684'\u2203'<\/p>\n

    — \u5373\u6bd4\u6700\u4f4e\u7684\u9ad8\u5373\u53ef<\/p>\n

    \u90e8\u95e8\u53f730\u7684\u4eba\u7684\u5de5\u8d44（\u53bb\u91cd）<\/p>\n

    \"\"<\/p>\n

    \u4f7f\u7528where sal>any(select . . .)\u9650\u5b9a\u201c\u6bd4\u4efb\u610f. . .\u5de5\u8d44\u9ad8\u201d\u7684\u9700\u6c42<\/p>\n

    \"\"<\/p>\n

    \u95ee\u9898<\/h5>\n

    \u5355\u5217\u591a\u884c\u5b50\u67e5\u8be2\u4e2dall\u7684\u4f7f\u7528\u662f\u5426\u5b8c\u5168\u53ef\u4ee5\u88abmin max\u66ff\u4ee3？<\/p>\n

    all<\/p>\n\n\u539f\u5199\u6cd5\u7b49\u4ef7\u5199\u6cd5\u542b\u4e49<\/tr>\n\n\n\n\n\n\n\n
    > ALL (\u5b50\u67e5\u8be2)<\/td>\n> (SELECT MAX(…) FROM …)<\/td>\n\u5927\u4e8e\u6240\u6709\u503c = \u5927\u4e8e\u6700\u5927\u503c<\/td>\n<\/tr>\n
    >= ALL (\u5b50\u67e5\u8be2)<\/td>\n>= (SELECT MAX(…) …)<\/td>\n\u5927\u4e8e\u7b49\u4e8e\u6240\u6709\u503c = \u5927\u4e8e\u7b49\u4e8e\u6700\u5927\u503c<\/td>\n<\/tr>\n
    < ALL (\u5b50\u67e5\u8be2)<\/td>\n< (SELECT MIN(…) …)<\/td>\n\u5c0f\u4e8e\u6240\u6709\u503c = \u5c0f\u4e8e\u6700\u5c0f\u503c<\/td>\n<\/tr>\n
    <= ALL (\u5b50\u67e5\u8be2)<\/td>\n<= (SELECT MIN(…) …)<\/td>\n\u5c0f\u4e8e\u7b49\u4e8e\u6240\u6709\u503c = \u5c0f\u4e8e\u7b49\u4e8e\u6700\u5c0f\u503c<\/td>\n<\/tr>\n
    = ALL (\u5b50\u67e5\u8be2)<\/td>\n\u5b50\u67e5\u8be2\u7ed3\u679c\u5168\u76f8\u7b49\u4e14\u7b49\u4e8e\u8be5\u503c<\/span><\/td>\n\u4e0d\u80fd\u7b80\u5355\u7528 MIN\/MAX \u66ff\u4ee3<\/td>\n<\/tr>\n
    <> ALL (\u5b50\u67e5\u8be2)<\/td>\n\u7b49\u4ef7\u4e8e NOT IN<\/span><\/td>\n\u4e0d\u80fd\u7528 MIN\/MAX \u66ff\u4ee3<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u5982：<\/p>\n

    > ALL \u7528 MAX<\/p>\n

    — \u539f\u5199\u6cd5
    \nselect ename, sal
    \nfrom emp
    \nwhere sal > all (select sal from emp where deptno = 30);<\/p>\n

    — \u7b49\u4ef7\u5199\u6cd5
    \nselect ename, sal
    \nfrom emp
    \nwhere sal > (select max(sal) from emp where deptno = 30); <\/p>\n

    any<\/p>\n\n\u5199\u6cd5\u7b49\u4ef7\u542b\u4e49\u53ef\u7528\u805a\u5408\u66ff\u4ee3<\/tr>\n\n\n\n\n\n\n\n
    > ANY (…)<\/td>\n\u5927\u4e8e\u6700\u5c0f\u503c<\/td>\n> (SELECT MIN(…))<\/td>\n<\/tr>\n
    >= ANY (…)<\/td>\n\u5927\u4e8e\u7b49\u4e8e\u6700\u5c0f\u503c<\/td>\n>= (SELECT MIN(…))<\/td>\n<\/tr>\n
    < ANY (…)<\/td>\n\u5c0f\u4e8e\u6700\u5927\u503c<\/td>\n< (SELECT MAX(…))<\/td>\n<\/tr>\n
    <= ANY (…)<\/td>\n\u5c0f\u4e8e\u7b49\u4e8e\u6700\u5927\u503c<\/td>\n<= (SELECT MAX(…))<\/td>\n<\/tr>\n
    = ANY (…)<\/td>\n\u7b49\u4e8e\u4efb\u610f\u4e00\u4e2a<\/td>\n\u7b49\u4ef7\u4e8e IN<\/td>\n<\/tr>\n
    <> ANY (…)<\/td>\n\u4e0d\u7b49\u4e8e\u4efb\u610f\u4e00\u4e2a<\/td>\n\u901a\u5e38\u6052\u4e3a\u771f，\u5c11\u7528<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    \u6ce8\u610f：\u867d\u7136\u5927\u90e8\u5206\u90fd\u53ef\u4ee5\u66ff\u4ee3，\u4f46\u662f\u5728\u5b9e\u9645\u4e2d\u6211\u4eec\u8981\u8c28\u614e\u7684\u9009\u62e9\u4f7f\u7528\u00a0all\/any \u4e0e min\/max \u3002（\u4e0d\u80fd\u65e0\u8111）<\/p>\n

    \u591a\u5217\u5b50\u67e5\u8be2<\/h3>\n
      \n
    • \u67e5\u8be2\u548c<\/span>SMITH<\/span>\u7684\u90e8\u95e8\u548c\u5c97\u4f4d\u5b8c\u5168\u76f8\u540c\u7684\u6240\u6709\u96c7\u5458，\u4e0d\u542b<\/span>SMITH<\/span>\u672c\u4eba\u3002<\/span><\/li>\n<\/ul>\n

      SMITH\u7684\u90e8\u95e8\u4e0e\u5c97\u4f4d<\/p>\n

      \"\"<\/p>\n

      \u4f7f\u7528(deptno<\/span>,job<\/span>)=(select deptno<\/span>,job <\/span>from . . .)\u9650\u5b9a\u90e8\u95e8\u4e0e\u5c97\u4f4d\u4e00\u81f4\u6027\u5e76\u4e14\u4f7f\u7528\u2018and\u2019\u9650\u5b9aename<\/p>\n

      \"\"<\/p>\n<\/p>\n

      \u6ce8\u610f：where\u4e0b\u4ee5\u62ec\u53f7\u8fdb\u884c\u7684\u6574\u4f53\u6bd4\u8f83，\u62ec\u53f7\u5185\u5143\u7d20\u987a\u5e8f\u4e00\u5b9a\u8981\u4e00\u81f4<\/span>\u3002<\/p>\n

      mysql> select*from emp
      \n where (job,deptno)=(select deptno, job — \u6b64\u5904\u62ec\u53f7\u5185\u987a\u5e8f\u4e0d\u4e00\u81f4 \u9519\u8bef！！
      \n from emp where ename='SMITH') and
      \n ename<>'SMITH'
      \n ;
      \nEmpty set, 14 warnings (0.00 sec)<\/p>\n

      \u603b\u7ed3：\u201c\u591a\u5217\u5b50\u67e5\u8be2\u201d\u5177\u6709\u9c9c\u660e\u7684\u7279\u5f81 — \u51e0\u4e4e\u76f4\u63a5\u6307\u5b9a\u4e86\u5224\u65ad\u4f9d\u636e，\u51cf\u5c11\u4e86\u9700\u6c42\u5206\u89e3\u3002<\/p>\n<\/p>\n

      \u5728<\/span>from<\/span>\u5b50\u53e5\u4e2d\u4f7f\u7528\u5b50\u67e5\u8be2<\/span><\/h3>\n
        \n
      • \u663e\u793a\u6bcf\u4e2a\u9ad8\u4e8e\u81ea\u5df1\u90e8\u95e8\u5e73\u5747\u5de5\u8d44\u7684\u5458\u5de5\u7684\u59d3\u540d\u3001\u90e8\u95e8\u3001\u5de5\u8d44\u3001\u5e73\u5747\u5de5\u8d44<\/span><\/li>\n<\/ul>\n

        \u2460\u5404\u90e8\u95e8\u5e73\u5747\u5de5\u8d44<\/p>\n

        \"\"<\/p>\n

        \u2461\u81ea\u5df1\u90e8\u95e8<\/p>\n

        \"\"<\/p>\n

        \u2462\u5355\u4f4d\u662f\u4e2a\u4eba<\/p>\n

        \"\"<\/p>\n

        \n
          \n
        • \u67e5\u627e\u6bcf\u4e2a\u90e8\u95e8\u5de5\u8d44\u6700\u9ad8\u7684\u4eba\u7684\u59d3\u540d\u3001\u5de5\u8d44\u3001\u90e8\u95e8\u3001\u6700\u9ad8\u5de5\u8d44<\/span><\/li>\n<\/ul>\n

          emp\u4e0e\u90e8\u95e8\u6700\u9ad8\u5de5\u8d44\u7b1b\u5361\u5c14\u79ef<\/p>\n

          \u6ce8\u610f：\u8981\u53bb\u9664\u65e0\u6548\u6570\u636e<\/p>\n

          \"\"<\/p>\n

          \u5de5\u8d44\u6700\u9ad8\u7684<\/p>\n

          \"\"<\/p>\n

          \n
            \n
          • \u663e\u793a\u6bcf\u4e2a\u90e8\u95e8\u7684\u4fe1\u606f（\u90e8\u95e8\u540d，\u7f16\u53f7，\u5730\u5740）\u548c\u4eba\u5458\u6570\u91cf<\/span><\/li>\n<\/ul>\n

            \u7b1b\u5361\u5c14\u79ef<\/p>\n

            \"\"<\/p>\n

            \u6bcf\u4e2a\u90e8\u95e8\u7684\u4eba\u5458\u6570<\/p>\n

            \"\"<\/p>\n

            \u4f7f\u7528where\u9650\u5b9a（\u6ce8\u610f：\u91cd\u547d\u540d\u4e3a\u4e2d\u6587\u7684'\u4eba\u5458\u6570'\u5728\u8fdb\u884c\u6210\u5458\u8bbf\u95ee\u65f6\u4e0d\u80fd\u52a0\u5f15\u53f7' '）<\/p>\n

            \"\"<\/p>\n<\/p>\n

            \u6ce8\u610f：<\/p>\n

            1.\u9002\u65f6\u91cd\u547d\u540d\u89e3\u51b3where\u5185\u65e0\u6cd5\u805a\u5408\u7684\u9650\u5236<\/p>\n

            2.\u5206\u6790\u9898\u610f（\u4e3b\u8981）<\/p>\n

            \u00a0 \u00a0 \u00a0 \u00a0 \u6b64\u9898\u4e2d\u201c\u81ea\u5df1\u90e8\u95e8\u5e73\u5747\u5de5\u8d44\u201d — \u6d89\u53ca\u4e24\u4e2a\u5355\u4f4d\u201c\u90e8\u95e8\u201d\u4e0e\u201c\u4e2a\u4eba\u201d\u5e76\u4e14\u7b5b\u9009\u4f9d\u636e\u662f\u81ea\u5df1\u5de5\u8d44\u4e0e\u90e8\u95e8\u5e73\u5747\u5de5\u8d44\u6bd4\u8f83—>\u7b1b\u5361\u5c14\u79ef<\/p>\n

            3.from\u540e\u7684（\u591a）\u8868\u5fc5\u987b\u62e5\u6709\u81ea\u5df1\u7684\u201c\u522b\u540d\u201d<\/p>\n

            4.\u7b1b\u5361\u5c14\u79ef\u540e\u5e38\u5e38\u4f7f\u7528where\u9650\u5b9a\u53bb\u9664\u65e0\u6548\u6570\u636e（\u50cf：emp\u7684\u90e8\u95e8\u53f7\u4e0edept\u7684\u90e8\u95e8\u53f7\u8981\u76f8\u7b49）<\/p>\n

            \n

            *\u5408\u5e76\u67e5\u8be2union [all]<\/h2>\n

            union \u8be5\u64cd\u4f5c\u7b26\u7528\u4e8e\u53d6\u5f97\u4e24\u4e2a\u7ed3\u679c\u96c6\u7684\u5e76\u96c6\u3002\u5f53\u4f7f\u7528\u8be5\u64cd\u4f5c\u7b26\u65f6，\u4f1a\u81ea\u52a8\u53bb\u6389\u7ed3\u679c\u96c6\u4e2d\u7684\u91cd\u590d\u884c<\/p>\n

            — \u5c06\u5de5\u8d44\u5927\u4e8e2500\u6216\u804c\u4f4d\u662fMANAGER\u7684\u4eba\u627e\u51fa\u6765<\/p>\n

            mysql> select ename, sal, job from EMP where sal>2500 union
            \n-> select ename, sal, job from EMP where job='MANAGER';–\u53bb\u6389\u4e86\u91cd\u590d\u8bb0\u5f55 <\/p>\n

            \"\"<\/p>\n

            union all<\/p>\n

            \u00a0— \u8be5\u64cd\u4f5c\u7b26\u7528\u4e8e\u53d6\u5f97\u4e24\u4e2a\u7ed3\u679c\u96c6\u7684\u5e76\u96c6\u3002\u5f53\u4f7f\u7528\u8be5\u64cd\u4f5c\u7b26\u65f6，\u4e0d\u4f1a\u53bb\u6389\u7ed3\u679c\u96c6\u4e2d\u7684\u91cd\u590d\u884c\u3002<\/p>\n

            \n
            \n
            \n

            \u611f\u8c22\u652f\u6301，\u957f\u671f\u8fde\u8f7d \u6b22\u8fce\u5173\u6ce8 \"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

            bit::Shadow\u2727(\u2256 \u25e1 \u2256\u273f\u00a0\u76ee\u5f55
            \n\u57fa\u672c\u67e5\u8be2
            \n\u603b\u7ed3
            \n\u987a\u5e8f
            \n\u77e5\u8bc6\u70b9\u57fa\u7840
            \n\u591a\u8868\u67e5\u8be2
            \n\u591a\u8868\u67e5\u8be2
            \n\u7b1b\u5361\u5c14\u79ef
            \n\u663e\u793a\u90e8\u95e8\u53f7\u4e3a10\u7684\u90e8\u95e8\u540d，\u5458\u5de5\u540d\u548c\u5de5\u8d44
            \n\u663e\u793a\u5404\u4e2a\u5458\u5de5\u7684\u59d3\u540d\u3001\u5de5\u8d44\u53ca\u5de5\u8d44\u7ea7\u522b
            \n\u603b\u7ed3
            \n\u5b50\u67e5\u8be2
            \n\u5355\u884c\u5b50\u67e5\u8be2
            \n\u591a\u884c\u5b50\u67e5\u8be2
            \nin\u7684\u4f7f\u7528
            \nall\u7684\u4f7f\u7528
            \nany\u7684\u4f7f\u7528
            \n\u95ee\u9898
            \n\u591a\u5217\u5b50\u67e5\u8be2
            \n\u5728from\u5b50\u53e5\u4e2d\u4f7f\u7528\u5b50\u67e5\u8be2
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