1:\u591a\u8868\u7684\u67e5\u8be2\u548c\u7b1b\u5361\u513f\u79ef
\n2:\u8868\u683c\u522b\u540d\u7684\u7528\u6cd5
\n3:\u4f7f\u7528sql server\u7684\u7edf\u8ba1\u51fd\u6570
\n4:\u7528group by\u5b50\u53e5\u5b9e\u73b0\u5206\u7ec4\u7684\u67e5\u8be2<\/p>\n
A:\u591a\u8868\u67e5\u8be2\u548c\u7b1b\u5c14\u513f\u79ef
\n\u5230\u76ee\u524d\u4e3a\u6b62,\u6211\u4eec\u6240\u7528\u7684\u90fd\u662f\u5355\u4e2a\u8868\u67e5\u8be2,\u4f46\u662f\u5728\u66f4\u591a\u7684\u60c5\u51b5\u7684\u4e0b,\u9700\u8981\u5bf9\u591a\u4e2a\u8868\u8fdb\u884c\u540c\u65f6\u67e5\u8be2,\u8fd9\u65f6\u53ef\u4ee5\u628a\u591a\u4e2a\u8868\u7684\u540d\u5b57\u5168\u90e8\u586b\u5199\u5728from\u5b50\u53e5\u4e2d.
\n\u6bd4\u5982:\u67e5\u8be2\u51fa\u6bcf\u4e2a\u804c\u5de5\u7684\u59d3\u540d,\u5b66\u5386,\u6240\u5728\u90e8\u95e8\u540d\u79f0.\u7531\u4e8e\u6211\u4eec\u9700\u8981\u7684\u7ed3\u679c\u6765\u81ea\u4e8e\u4e24\u4e2a\u8868,\u6240\u4ee5\u5fc5\u987b\u7528\u591a\u8868\u67e5\u8be2
\nselect \u59d3\u540d,\u5b66\u5386,\u90e8\u95e8\u540d\u79f0,\u8d1f\u8d23\u4eba from work,\u90e8\u95e8 [\u5206\u6790\u4e3a\u4ec0\u4e48\u662f\u9519\u8bef\u7684]
\n\u539f\u56e0:\u95ee\u9898\u51fa\u5728\u5bf9\u8868\u683c\u8fde\u63a5\u6761\u4ef6\u7684\u9650\u5236\u4e0a.\u5728\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d,\u6ca1\u80fd\u5bf9\u8868\u683c\u8fde\u63a5\u6761\u4ef6\u4f5c\u4efb\u4f55\u9650\u5236,\u6240\u4ee5sql\u4f1a\u5728work\u8868\u4e2d\u6bcf\u53d6\u51fa\u4e00\u6761\u8bb0\u5f55,\u5c31\u4e0e\u90e8\u95e8\u8868\u4e2d\u7684\u6240\u6709\u8bb0\u5f55\u7ec4\u5408\u4e00\u6b21,\u90a3\u4e48\u5047\u8bbework\u8868\u6709m\u6761\u8bb0\u5f55,\u800c\u90e8\u95e8\u8868\u4e2d\u6709n\u6761\u8bb0\u5f55,\u5219\u5f97\u51fa\u7684\u7ed3\u679c\u4e3am*n\u6761\u8bb0\u5f55\u8fd9\u5c31\u662f\u7b1b\u5c14\u513f\u79ef,\u6240\u4ee5\u7b1b\u5c14\u513f\u79ef\u8fd4\u56de\u7684\u5927\u591a\u6570\u7684\u7ed3\u679c\u662f\u5197\u4f59\u7684\u3001\u65e0\u7528\u7684,\u6240\u4ee5\u5e94\u8be5\u907f\u514d\u7b1b\u5c14\u513f\u79ef\u7684\u4ea7\u751f.
\n\u89e3\u51b3\u7b1b\u5c14\u513f\u79ef\u7684\u65b9\u6cd5:\u4e8b\u5b9e\u4e0a\u7531\u4e8e\u7b1b\u5c14\u513f\u79ef\u662f\u56e0\u4e3a\u4e24\u4e2a\u8868\u7684\u8fde\u63a5\u6761\u4ef6\u6ca1\u6709\u9650\u5236\u9020\u6210\u7684,\u6240\u4ee5\u53ea\u8981\u6211\u4eec\u5bf9\u4e24\u4e2a\u8868\u7684\u8fde\u63a5\u8fdb\u884c\u6761\u4ef6\u9650\u5236,\u5c31\u53ef\u4ee5\u907f\u514d\u7b1b\u5c14\u513f\u79ef\u7684\u4ea7\u751f.\u53ef\u4ee5\u901a\u8fc7\u4e00\u4e2awhere\u5b50\u53e5,\u6765\u8fde\u63a5\u4e24\u4e2a\u8868\u7684\u516c\u5171\u7684\u5b57\u6bb5\u5c31\u53ef\u4ee5\u4e86.
\n\u6240\u4ee5\u5c06\u4e0a\u9762\u7684\u8bed\u53e5\u6539\u6210:select \u59d3\u540d,\u5b66\u5386,\u90e8\u95e8\u540d\u79f0,\u8d1f\u8d23\u4eba from work,\u90e8\u95e8 where work.\u90e8\u95e8\u7f16\u53f7=\u90e8\u95e8.\u90e8\u95e8\u7f16\u53f7<\/p>\n
B:\u4f7f\u7528\u8868\u683c\u7684\u522b\u540d
\nA:\u5f53\u4f7f\u7528\u591a\u4e2a\u8868\u8fdb\u884c\u67e5\u8be2\u65f6,\u5982\u679c\u6709\u4e24\u4e2a\u8868\u4e2d\u6709\u76f8\u540c\u7684\u5217,\u5e94\u8be5\u6307\u660e\u9009\u4e2d\u7684\u662f\u54ea\u4e2a\u8868\u4e2d\u7684\u5217.
\n\u6bd4\u5982:\u5728work\u8868\u68c0\u7d22\u51fa\u5728address\u8868\u4e2d\u90fd\u6709\u7684\u804c\u5de5\u7684\u804c\u5de5\u53f7,\u59d3\u540d,\u5b66\u5386,\u57fa\u672c\u5de5\u8d44
\nselect \u804c\u5de5\u53f7,\u59d3\u540d,\u5b66\u5386,\u57fa\u672c\u5de5\u8d44 from work,address where work.\u804c\u5de5\u53f7=address.\u804c\u5de5\u53f7
\n\u4e0a\u9762\u7684\u8bed\u53e5\u662f\u9519\u8bef\u7684,\u539f\u56e0\u662f\u5bf9\u4e8ework\u548caddress\u8868\u90fd\u6709\u804c\u5de5\u53f7,\u59d3\u540d\u5217,\u6240\u4ee5\u5e94\u8be5\u6307\u660e\u662f\u54ea\u4e2a\u8868\u7684\u804c\u5de5\u53f7\u548c\u59d3\u540d.
\n\u6539\u6210:select work.\u804c\u5de5\u53f7,work.\u59d3\u540d,\u5b66\u5386,\u57fa\u672c\u5de5\u8d44 from work,address where work.\u804c\u5de5\u53f7=address.\u804c\u5de5\u53f7
\n\u6216\u8005:select address.\u804c\u5de5\u53f7,address.\u59d3\u540d,\u5b66\u5386,\u57fa\u672c\u5de5\u8d44 from work,address where work.\u804c\u5de5\u53f7=address.\u804c\u5de5\u53f7
\n\u60f3\u4e00\u60f3:\u4e3a\u4ec0\u4e48\u5bf9\u4e8e\u5b66\u5386,\u57fa\u672c\u5de5\u8d44\u6ca1\u6709\u6307\u660e\u8868\u540d:\u5373:work.\u5b66\u5386,work.\u57fa\u672c\u5de5\u8d44[\u53ea\u6709\u4e00\u4e2a\u8868\u6709\u8fd9\u4e9b\u5217]
\nB:\u5141\u8bb8\u4f7f\u7528\u522b\u540d\u6765\u8bbf\u95ee\u8868.
\n\u683c\u5f0f:1:\u8868\u540d as \u522b\u540d
\n2:\u8868\u540d \u522b\u540d
\n\u4f8b\u5982:\u4e0a\u9762\u7684\u8bed\u53e5\u53ef\u6539\u5199\u6210:
\nselect w.\u804c\u5de5\u53f7,w.\u59d3\u540d,\u5b66\u5386,\u57fa\u672c\u5de5\u8d44 from work as w,address as a where w.\u804c\u5de5\u53f7=a.\u804c\u5de5\u53f7
\n\u4e0a\u9762\u7684\u8bed\u53e5\u4e2d\u5728from\u4e2d\u5f15\u7528\u4e24\u4e2a\u8868,\u5e76\u4e14\u4e3a\u8868work\u6307\u660e\u4e86\u522b\u540dw,\u4e3a\u8868address\u6307\u660e\u4e86\u522b\u540da,\u6240\u4ee5\u5c31\u53ef\u4ee5\u7528w\u6765\u4ee3\u8868work\u8868,\u7528a\u6765\u4ee3\u8868address\u8868.\u6216\u8005\u7701\u7565as\u76f4\u63a5\u6539\u6210:select w.\u804c\u5de5\u53f7,w.\u59d3\u540d,\u5b66\u5386,\u57fa\u672c\u5de5\u8d44 from work w,address a where w.\u804c\u5de5\u53f7=a.\u804c\u5de5\u53f7
\nC:\u5982\u679c\u4f7f\u7528\u4e86\u522b\u540d,\u5219\u4ee5\u540e\u6240\u6709\u67e5\u8be2\u8bed\u53e5\u4e2d,\u90fd\u5fc5\u987b\u4f7f\u7528\u522b\u540d\u5217
\n\u6bd4\u5982:select work.\u804c\u5de5\u53f7,work.\u59d3\u540d,\u5b66\u5386,\u57fa\u672c\u5de5\u8d44 from work w,address a where w.\u804c\u5de5\u53f7=a.\u804c\u5de5\u53f7 [\u662f\u9519\u8bef\u7684]<\/p>\n
C:\u4f7f\u7528\u7edf\u8ba1\u51fd\u6570:
\nsql\u8ddf\u6211\u4eec\u63d0\u4f9b\u4e86\u4ee5\u4e0b\u51e0\u4e2a\u7edf\u8ba1\u51fd\u6570:
\nsum:\u8fd4\u56de\u4e00\u4e2a\u6570\u5b57\u5217\u7684\u603b\u548c
\navg:\u5bf9\u4e00\u4e2a\u6570\u5b57\u5217\u6c42\u5e73\u5747\u503c
\nmin:\u5bf9\u4e00\u4e2a\u6570\u5b57\u5217\u6c42\u6700\u5c0f\u503c
\nmax:\u5bf9\u4e00\u4e2a\u6570\u5b57\u5217\u6c42\u6700\u5927\u503c
\ncount:\u8fd4\u56de\u6ee1\u8db3select\u8bed\u53e5\u4e2d\u6307\u5b9a\u7684\u6761\u4ef6\u7684\u8bb0\u5f55\u4e2a\u6570
\n\u4e3e\u5217:1:\u6c42\u51fawork\u8868\u4e2d\u6240\u6709\u7537\u804c\u5de5\u7684\u57fa\u672c\u5de5\u8d44\u7684\u548c
\nselect sum(\u57fa\u672c\u5de5\u8d44) as \u6027\u522b\u4e3a\u7537\u7684\u57fa\u672c\u5de5\u8d44 from work where \u6027\u522b=\\’\u7537\\’
\n2:\u6c42\u51fawork\u8868\u4e2d\u6240\u6709\u804c\u79f0\u662f\u7ecf\u7406\u7684\u6700\u9ad8\u5de5\u8d44\u548c\u6700\u4f4e\u5de5\u8d44,\u5e73\u5747\u5de5\u8d44
\nselect max(\u57fa\u672c\u5de5\u8d44) as \u6700\u9ad8\u5de5\u8d44,min(\u57fa\u672c\u5de5\u8d44) as \u6700\u4f4e\u5de5\u8d44,avg(\u5e73\u5747\u5de5\u8d44) as \u5e73\u5747\u5de5\u8d44 from work
\n3:\u4e0e\u7edf\u8ba1\u51fd\u6570\u4e00\u8d77\u4f7f\u7528distinct\u5173\u952e\u5b57[\u901a\u5e38\u53ea\u4e0ecount\u51fd\u6570\u4f7f\u7528]
\n\u4f8b:1:\u68c0\u7d22\u51fawork\u8868\u4e2d\u5b66\u5386\u7684\u4e2a\u6570
\nselect count(\u5b66\u5386) from work
\n2:\u68c0\u7d22\u51fawork\u8868\u4e2d\u5b66\u5386\u7684\u79cd\u7c7b\u7684\u4e2a\u6570
\nselect count(distinct \u5b66\u5386) from work
\n\u8bd5\u4e00\u8bd5:select distinct count(\u5b66\u5386) from work \u53ef\u884c\u5426?
\n3:\u6709work\u548c\u90e8\u95e8\u8868,\u68c0\u7d22\u51fa\u5728\u9500\u552e\u90e8\u5de5\u4f5c\u7684\u5458\u5de5\u7684\u4e2a\u6570
\nselect \\’\u9500\u552e\u90e8\u7684\u4eba\u6570\\’=count(\u804c\u5de5\u53f7) from work a,\u90e8\u95e8 b
\nwhere a.\u90e8\u95e8\u7f16\u53f7=b.\u90e8\u95e8\u7f16\u53f7 and b.\u90e8\u95e8\u540d\u79f0=\\’\u9500\u552e\u90e8\\’
\n4:\u5728work\u8868\u4e2d\u68c0\u7d22\u51fa\u5176\u57fa\u672c\u5de5\u8d44\u5c0f\u4e8e\u804c\u5de5\u5e73\u5747\u5de5\u8d44\u7684\u4eba\u6570
\nselect count(\u804c\u5de5\u53f7) as \u4eba\u6570 from work
\nwhere \u57fa\u672c\u5de5\u8d44<(select avg(\u57fa\u672c\u5de5\u8d44) from work)
\n5:\u6709\u5b66\u79d1\u8868\u548c\u5b66\u8d39\u8868,\u4ece\u5b66\u8d39\u8868\u68c0\u7d22\u51fa\u6709\u591a\u5c11\u4e2a\u5b66\u7f51\u9875\u8bbe\u8ba1\u7684\u4eba
\nselect count(\u5b66\u53f7) as \u7f51\u9875\u8bbe\u8ba1\u7684\u4eba\u6570 from \u5b66\u8d39 a,\u5b66\u79d1 b
\nwhere a.\u6240\u5b66\u4e13\u4e1a\u4ee3\u53f7=b.\u8bfe\u7a0b\u7f16\u53f7 and b.\u8bfe\u7a0b\u540d\u79f0=\\’\u7f51\u9875\u8bbe\u8ba1\\’<\/p>\n
D:\u4f7f\u7528group by\u5b50\u53e5\u5bf9\u7ed3\u679c\u8fdb\u884c\u5206\u7c7b[\u53ea\u7528\u4e8e\u7edf\u8ba1\u51fd\u6570]
\n\u4e3e\u5217:1:\u68c0\u7d22\u51fawork\u8868\u5404\u804c\u79f0\u7684\u4eba\u6570.
\nselect \u804c\u79f0,count(\u804c\u79f0) as \u804c\u79f0\u4eba\u6570 from work group by \u804c\u79f0
\n2:\u68c0\u7d22\u51fa\u5404\u5b66\u5386\u7684\u5e73\u5747\u5de5\u8d44.
\nselect \u5b66\u5386,avg(\u57fa\u672c\u5de5\u8d44) from work group by \u5b66\u5386
\n3:\u6709\u5b66\u79d1\u8868\u548c\u5b66\u8d39\u8868,\u8981\u6c42\u7edf\u8ba1\u51fa\u5404\u5b66\u79d1\u7684\u5b66\u751f\u6570\u76ee.
\nselect \u6240\u5b66\u4e13\u4e1a\u4ee3\u53f7,count(\u6240\u5b66\u4e13\u4e1a\u4ee3\u53f7) as \u4eba\u6570 into #abc from \u5b66\u8d39 group by \u6240\u5b66\u4e13\u4e1a\u4ee3\u53f7
\nselect \u8bfe\u7a0b\u540d\u79f0,\u4eba\u6570 from #abc,\u5b66\u79d1 where \u6240\u5b66\u4e13\u4e1a\u4ee3\u53f7=\u8bfe\u7a0b\u7f16\u53f7
\n4:\u6709\u804c\u5de5\u8868\u548c\u5546\u54c1\u9500\u552e\u8868,\u8981\u6c42\u68c0\u7d22\u51fa\u6bcf\u4e2a\u804c\u5de5\u7684\u804c\u5de5\u53f7,\u59d3\u540d,\u9500\u552e\u603b\u91cf.
\nselect \u804c\u5de5\u53f7,sum(\u9500\u552e\u91cf) as \u9500\u552e\u603b\u91cf into #abcd from \u5546\u54c1\u9500\u552e group by \u804c\u5de5\u53f7
\nselect \u804c\u5de5.\u804c\u5de5\u53f7,\u59d3\u540d,\u9500\u552e\u603b\u91cf from \u804c\u5de5,#abcd where #abcd.\u804c\u5de5\u53f7=\u804c\u5de5.\u804c\u5de5\u53f7
\n5:\u67e5\u8be2\u51fa\u6bcf\u4e2a\u90e8\u95e8\u6700\u9ad8\u7684\u57fa\u672c\u5de5\u8d44,\u663e\u793a\u90e8\u95e8\u540d\u79f0\u548c\u6700\u9ad8\u57fa\u672c\u5de5\u8d44
\nselect \u90e8\u95e8\u540d\u79f0,max(\u57fa\u672c\u5de5\u8d44) from work group by \u90e8\u95e8\u540d\u79f0
\n\u8bf4\u660e:1:\u5728group by\u4e2d\u4e0d\u652f\u6301\u5bf9\u5217\u540d\u7684\u5206\u914d\u7684\u522b\u540d
\nselect \u5b66\u5386 as \u804c\u5de5\u5b66\u5386,count(\u5b66\u5386) from work group by \u804c\u5de5\u5b66\u5386 [\u9519\u9519]
\n\u6539\u4e3a:select \u5b66\u5386 as \u804c\u5de5\u5b66\u5386,count(\u5b66\u5386) from work group by \u5b66\u5386
\n2:select\u540e\u9762\u6bcf\u4e00\u5217\u6570\u636e\u9664\u4e86\u5728\u7edf\u8ba1\u51fd\u6570\u4e2d\u7684\u5217\u4ee5\u5916\u90fd\u5fc5\u987b\u5728group by\u5b50\u53e5\u51fa\u73b0
\n\u6bd4\u5982:select \u5b66\u5386,\u6027\u522b,sum(\u57fa\u672c\u5de5\u8d44) from work group by \u5b66\u5386[\u9519\u9519]
\n\u6539\u4e3a:select \u5b66\u5386,\u6027\u522b,sum(\u57fa\u672c\u5de5\u8d44) from work group by \u5b66\u5386,\u6027\u522b
\n\u610f\u4e49:\u5404\u5b66\u5386\u5404\u6027\u522b\u7684\u57fa\u672c\u5de5\u8d44\u4e4b\u548c<\/p>\n
5:\u4f7f\u7528having\u5173\u952e\u5b57\u6765\u7b5b\u9009\u7ed3\u679c
\n6:\u4f7f\u7528compute\u548ccompute by\u5b50\u53e5
\n7:\u4f7f\u7528\u5d4c\u5957\u67e5\u8be2
\n8:\u5206\u5e03\u5f0f\u67e5\u8be2<\/p>\n
E:\u4f7f\u7528having\u5173\u952e\u5b57\u6765\u7b5b\u9009\u7ed3\u679c
\n\u5f53\u5b8c\u6210\u5bf9\u6570\u636e\u7ed3\u679c\u7684\u67e5\u8be2\u548c\u7edf\u8ba1\u540e,\u53ef\u4ee5\u4f7f\u7528having\u5173\u952e\u5b57\u6765\u5bf9\u67e5\u8be2\u548c\u8ba1\u7b97\u7684\u7ed3\u679c\u8fdb\u884c\u4e00\u6b65\u7684\u7b5b\u9009
\n\u4f8b:\u68c0\u7d22\u51fawork\u8868\u4e2d\u5b66\u5386\u662f\u5927\u4e13\u6216\u8005\u662f\u4e2d\u4e13\u7684\u4eba\u6570
\nselect \u5b66\u5386,count(\u5b66\u5386) from work group by \u5b66\u5386 having \u5b66\u5386 in(\\’\u5927\u4e13\\’,\\’\u4e2d\u4e13\\’)
\n\u8bf4\u660e:1:having\u5173\u952e\u5b57\u90fd\u4e0egroup by\u7528\u5728\u4e00\u8d77.
\n2:having\u4e0d\u652f\u6301\u5bf9\u5217\u5206\u914d\u7684\u522b\u540d
\n\u4f8b\u5982:select \u5b66\u5386,\\’\u5927\u4e8e5\u7684\u4eba\u6570\\’=count(\u5b66\u5386) from work group by \u5b66\u5386 having \u5927\u4e8e5\u7684\u4eba\u6570>5 [\u9519\u9519]
\n\u6539\u4e3a:select \u5b66\u5386,\\’\u5927\u4e8e5\u7684\u4eba\u6570\\’=count(\u5b66\u5386) from work group by \u5b66\u5386 having count(\u5b66\u5386)>5<\/p>\n
F:\u4f7f\u7528compute\u548ccompute by
\n\u4f7f\u7528compute\u5b50\u53e5\u5141\u8bb8\u540c\u65f6\u89c2\u5bdf\u67e5\u8be2\u6240\u5f97\u5230\u5404\u5217\u7684\u6570\u636e\u7684\u7ec6\u8282\u4ee5\u53ca\u7edf\u8ba1\u5404\u5217\u6570\u636e\u6240\u4ea7\u751f\u7684\u6c47\u603b\u5217
\nselect * from work [\u67e5\u8be2\u6240\u5f97\u5230\u7684\u5404\u5217\u7684\u6570\u636e\u7684\u7ec6\u8282]
\ncompute max(\u57fa\u672c\u5de5\u8d44),min(\u57fa\u672c\u5de5\u8d44) [\u7edf\u8ba1\u4e4b\u540e\u7684\u7ed3\u679c]
\n\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u6ca1\u6709\u4f7f\u7528by\u5173\u952e\u5b57,\u8fd4\u56de\u7684\u7ed3\u679c\u662f\u6700\u540e\u6dfb\u52a0\u4e86\u4e00\u884c\u57fa\u672c\u5de5\u8d44\u7684\u6700\u5927\u503c\u548c\u6700\u5c0f\u503c,\u4e5f\u53ef\u589e\u52a0by\u5173\u952e\u5b57.
\n\u4f8b:select * from work order by \u5b66\u5386
\ncompute max(\u57fa\u672c\u5de5\u8d44),min(\u57fa\u672c\u5de5\u8d44) by \u5b66\u5386
\n\u6bd4\u8f83:select \u5b66\u5386,max(\u57fa\u672c\u5de5\u8d44),min(\u57fa\u672c\u5de5\u8d44) from work group by \u5b66\u5386
\n\u8bf4\u660e:1:compute\u5b50\u53e5\u5fc5\u987b\u4e0eorder by\u5b50\u53e5\u7528\u5728\u4e00\u8d77
\n2:compute\u5b50\u53e5\u53ef\u4ee5\u8fd4\u56de\u591a\u79cd\u7ed3\u679c\u96c6.\u4e00\u79cd\u662f\u4f53\u73b0\u6570\u636e\u7ec6\u8282\u7684\u6570\u636e\u96c6,\u53ef\u4ee5\u6309\u5206\u7c7b\u8981\u6c42\u8fdb\u884c\u6b63\u786e\u7684\u5206\u7c7b\uff1b\u53e6\u4e00\u79cd\u5728\u5206\u7c7b\u7684\u57fa\u7840\u4e0a\u8fdb\u884c\u6c47\u603b\u4ea7\u751f\u7ed3\u679c.
\n3:\u800cgroup by\u5b50\u53e5\u5bf9\u6bcf\u4e00\u7c7b\u6570\u636e\u5206\u7c7b\u4e4b\u540e\u53ea\u80fd\u4ea7\u751f\u4e00\u4e2a\u7ed3\u679c,\u4e0d\u80fd\u77e5\u9053\u7ec6\u8282<\/p>\n
G:\u4f7f\u7528\u5d4c\u5957\u67e5\u8be2
\n\u67e5\u8be2\u4e2d\u518d\u67e5\u8be2,\u901a\u5e38\u662f\u4ee5\u4e00\u4e2a\u67e5\u8be2\u4f5c\u4e3a\u6761\u4ef6\u6765\u4f9b\u53e6\u4e00\u4e2a\u67e5\u8be2\u4f7f\u7528
\n\u4f8b:\u6709work\u8868\u548c\u90e8\u95e8\u8868
\nA:\u68c0\u7d22\u51fa\u5728\u90e8\u95e8\u8868\u4e2d\u767b\u8bb0\u7684\u6240\u6709\u90e8\u95e8\u7684\u804c\u5de5\u57fa\u672c\u8d44\u6599
\nselect * from work where \u90e8\u95e8\u7f16\u53f7 in [not in](select \u90e8\u95e8\u7f16\u53f7 from dbo.\u90e8\u95e8)
\nB:\u68c0\u7d22\u51fa\u5728work\u8868\u4e2d\u6bcf\u4e00\u4e2a\u90e8\u95e8\u7684\u6700\u9ad8\u57fa\u672c\u5de5\u8d44\u7684\u804c\u5de5\u8d44\u6599
\nselect * from work a where \u57fa\u672c\u5de5\u8d44=(select max(\u57fa\u672c\u5de5\u8d44) from work b where a.\u90e8\u95e8\u540d\u79f0=b.\u90e8\u95e8\u540d\u79f0)
\n\u8bf4\u660e:\u7531\u5916\u67e5\u8be2\u63d0\u4f9b\u4e00\u4e2a\u90e8\u95e8\u540d\u79f0\u7ed9\u5185\u67e5\u8be2,\u5185\u67e5\u8be2\u5229\u7528\u8fd9\u4e2a\u90e8\u95e8\u540d\u79f0\u627e\u5230\u8be5\u90e8\u95e8\u7684\u6700\u9ad8\u57fa\u672c\u5de5\u8d44,\u7136\u540e\u5916\u67e5\u8be2\u6839\u636e\u57fa\u672c\u5de5\u8d44\u5224\u65ad\u662f\u5426\u7b49\u4e8e\u6700\u9ad8\u5de5\u8d44,\u5982\u679c\u662f\u7684,\u5219\u663e\u793a\u51fa\u6765.
\n\u76f8\u5f53\u4e8e:select * from work,(select \u90e8\u95e8\u540d\u79f0,max(\u57fa\u672c\u5de5\u8d44) as \u57fa\u672c\u5de5\u8d44 from work group by \u90e8\u95e8\u540d\u79f0 as t) where work.\u57fa\u672c\u5de5\u8d44=t.\u57fa\u672c\u5de5\u8d44 and work.\u90e8\u95e8\u540d\u79f0=t.\u90e8\u95e8\u540d\u79f0
\nC:\u7528\u5d4c\u5957work\u8868\u548c\u5d4c\u5957\u90e8\u95e8\u8868,\u5728\u5d4c\u5957work\u8868\u4e2d\u68c0\u7d22\u51fa\u59d3\u540d\u548c\u804c\u5de5\u53f7\u90fd\u5728\u5d4c\u5957\u90e8\u95e8\u5b58\u5728\u7684\u804c\u5de5\u8d44\u6599
\nselect * from \u5d4c\u5957work where \u804c\u5de5\u53f7 in (select \u804c\u5de5\u53f7 from \u5d4c\u5957\u90e8\u95e8) and \u59d3\u540d in (select \u59d3\u540d from \u5d4c\u5957\u90e8\u95e8) [\u5bdf\u770b\u7ed3\u679c,\u5206\u6790\u539f\u56e0]
\n\u6539:select * from \u5d4c\u5957work a,\u5d4c\u5957\u90e8\u95e8 b where a.\u804c\u5de5\u53f7=b.\u804c\u5de5\u53f7 and a.\u59d3\u540d=b.\u59d3\u540d
\n\u6539:select * from \u5d4c\u5957work where \u804c\u5de5\u53f7=(select \u804c\u5de5\u53f7 from \u5d4c\u5957\u90e8\u95e8) and \u59d3\u540d=(select \u59d3\u540d from \u5d4c\u5957\u90e8\u95e8) [\u884c\u5417?\u4e3a\u4ec0\u4e48,\u5206\u6790\u539f\u56e0?]<\/p>\n
\u5728\u5d4c\u5957\u4e2d\u4f7f\u7528exists\u5173\u952e\u5b57[\u5b58\u5728]
\n\u4f8b:1:\u7528\u5d4c\u5957work\u8868\u548c\u5d4c\u5957\u90e8\u95e8\u8868,\u5728\u5d4c\u5957work\u8868\u4e2d\u68c0\u7d22\u51fa\u59d3\u540d\u548c\u804c\u5de5\u53f7\u90fd\u5728\u5d4c\u5957\u90e8\u95e8\u5b58\u5728\u7684\u804c\u5de5\u8d44\u6599
\nselect * from \u5d4c\u5957work a where exists (select * from \u5d4c\u5957\u90e8\u95e8 b where a.\u59d3\u540d=b.\u59d3\u540d and a.\u804c\u5de5\u53f7=b.\u804c\u5de5\u53f7)
\n2:\u5728work\u8868\u68c0\u7d22\u51fa\u5728\u90e8\u95e8\u8868\u6ca1\u6709\u7684\u804c\u5de5
\nselect * from work where not exists (select * from \u90e8\u95e8 where \u90e8\u95e8.\u90e8\u95e8\u7f16\u53f7=work.\u90e8\u95e8\u7f16\u53f7)
\n\u80fd\u5426\u6539\u6210:select * from work where exists (select * from \u90e8\u95e8 where \u90e8\u95e8.\u90e8\u95e8\u7f16\u53f7<>work.\u90e8\u95e8\u7f16\u53f7)<\/p>\n
\u5728\u5217\u6e05\u5355\u4e2d\u4f7f\u7528select
\n\u4f8b:1:\u5728work1\u8868\u548c\u90e8\u95e8\u8868\u4e2d\u68c0\u7d22\u51fa\u6240\u6709\u90e8\u95e8\u7684\u90e8\u95e8\u540d\u79f0\u548c\u57fa\u672c\u5de5\u8d44\u603b\u548c
\nselect \u90e8\u95e8\u540d\u79f0,(select sum(\u57fa\u672c\u5de5\u8d44) from work1 b where a.\u90e8\u95e8\u7f16\u53f7=b.\u90e8\u95e8\u7f16\u53f7) from \u90e8\u95e8 a
\n2:\u68c0\u7d22\u5404\u90e8\u95e8\u7684\u804c\u5de5\u4eba\u6570
\nselect \u90e8\u95e8\u7f16\u53f7,\u90e8\u95e8\u540d\u79f0,(select count(\u804c\u5de5\u53f7) from work1 a where a.\u90e8\u95e8\u7f16\u53f7=b.\u90e8\u95e8\u7f16\u53f7) as \u4eba\u6570 from \u90e8\u95e8 b
\n3:\u5728\u5546\u54c1\u8868\u548c\u9500\u552e\u8868\u4e2d\u67e5\u8be2\u6bcf\u4e00\u804c\u5de5\u7684\u59d3\u540d,\u6240\u5c5e\u90e8\u95e8,\u9500\u552e\u603b\u91cf
\nselect \u59d3\u540d,\u6240\u5c5e\u90e8\u95e8,(select sum(\u9500\u552e\u91cf) from \u5546\u54c1\u9500\u552e a where a.\u804c\u5de5\u53f7=b.\u804c\u5de5\u53f7) as \u9500\u552e\u603b\u91cf from \u5d4c\u5957\u90e8\u95e8 b<\/p>\n
H:\u5206\u5e03\u5f0f\u67e5\u8be2
\n\u6211\u4eec\u4ee5\u524d\u7684\u67e5\u8be2\u90fd\u53ea\u662f\u57fa\u4e8e\u4e00\u4e2a\u670d\u52a1\u5668\u4e2d\u7684\u4e00\u4e2a\u6570\u636e\u5e93\u7684\u67e5\u8be2,\u5982\u679c\u4e00\u4e2a\u67e5\u8be2\u662f\u8981\u8de8\u8d8a\u4e00\u4e2a\u670d\u52a1\u5668,\u50cf\u8fd9\u6837\u7684\u67e5\u8be2\u5c31\u662f\u5206\u5e03\u5f0f\u67e5\u8be2,\u90a3\u4e48\u6211\u4eec\u4ee5\u770b\u5230\u5206\u5e03\u67e5\u8be2\u5c31\u662f\u6570\u636e\u6e90\u81ea\u4e8e\u4e24\u4e2a\u670d\u52a1\u5668.\u8981\u8fdb\u884c\u5206\u5e03\u5f0f\u67e5\u8be2\u5fc5\u987b\u5148\u521b\u5efa\u4e00\u4e2a\u201c\u94fe\u63a5\u670d\u52a1\u5668\u201d,\u4ee5\u4fbf\u8ba9\u672c\u5730\u7684\u7528\u6237\u80fd\u591f\u6620\u5c04\u5230\u8fc7\u7a0b\u670d\u52a1\u5668.
\n\u201c\u94fe\u63a5\u670d\u52a1\u5668\u201d\u7684\u521b\u7acb
\nA:\u5728\u201c\u94fe\u63a5\u670d\u52a1\u5668\u201d\u91cc\u9762\u8f93\u5165\u4ee5\u540e\u4e3a\u4e86\u65b9\u4fbf\u8bbf\u95ee\u8be5\u94fe\u63a5\u670d\u52a1\u5668\u7684\u540d\u79f0[\u4efb\u610f]
\nB:\u5728\u201c\u63d0\u4f9b\u7a0b\u5e8f\u540d\u79f0\u201d\u91cc\u9762\u9009\u62e9\u201cMicrosoft OLE DB Provider for SQL Server\u201d
\nC:\u5728\u201c\u6570\u636e\u6e90\u201d\u91cc\u9762\u8f93\u5165\u670d\u52a1\u5668\u7684\u7f51\u7edc\u540d
\nD:\u672c\u5730\u767b\u5f55,\u8fdc\u7a0b\u7528\u6237\u548c\u8fdc\u7a0b\u5bc6\u7801\u91cc\u9762\u5206\u522b\u8f93\u5165\u4e00\u4e2a\u672c\u5730\u767b\u5f55\u7528\u6237,\u8fdc\u7a0b\u767b\u5f55\u548c\u8fdc\u7a0b\u5bc6\u7801\u4ee5\u4fbf\u8ba9\u672c\u5730SQL Server\u767b\u5f55\u6620\u5c04\u4e3a\u94fe\u63a5\u670d\u52a1\u5668\u4e0a\u7684\u7528\u6237
\nE:\u8bbf\u95ee\u65b9\u6cd5:\u683c\u5f0f:\u94fe\u63a5\u670d\u52a1\u5668\u7684\u540d\u79f0.\u6570\u636e\u5e93\u540d.dbo.\u8868\u540d
\n\u94fe\u63a5\u670d\u52a1\u5668\u6709\u4e24\u4e2a\u7279\u70b9:
\n1:\u901a\u8fc7\u94fe\u63a5\u670d\u52a1\u5668\u4e0d\u80fd\u5220\u9664\u94fe\u63a5\u6e90\u670d\u52a1\u5668\u7684\u4efb\u4f55\u5bf9\u50cf.
\n2:\u80fd\u8fc7\u94fe\u63a5\u670d\u52a1\u5668\u53ef\u4ee5\u5bf9\u94fe\u63a5\u6e90\u670d\u52a1\u5668\u7684\u8868\u8fdb\u884cinsert,updae,delete\u64cd\u4f5c.<\/p>\n","protected":false},"excerpt":{"rendered":"
1:\u591a\u8868\u7684\u67e5\u8be2\u548c\u7b1b\u5361\u513f\u79ef 2:\u8868\u683c\u522b\u540d\u7684\u7528\u6cd5 3:\u4f7f\u7528sql server\u7684\u7edf\u8ba1\u51fd\u6570 4:\u7528group by\u5b50 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-1543","post","type-post","status-publish","format-standard","hentry","category-code_related"],"_links":{"self":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/1543","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/comments?post=1543"}],"version-history":[{"count":1,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/1543\/revisions"}],"predecessor-version":[{"id":5155,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/posts\/1543\/revisions\/5155"}],"wp:attachment":[{"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/media?parent=1543"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/categories?post=1543"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kyle.ai\/blog\/wp-json\/wp\/v2\/tags?post=1543"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}