{"id":906,"date":"2012-10-12T12:00:20","date_gmt":"2012-10-12T04:00:20","guid":{"rendered":"http:\/\/www.poloo.org\/?p=906"},"modified":"2012-10-12T13:18:51","modified_gmt":"2012-10-12T05:18:51","slug":"mysql%e5%bc%80%e5%8f%91%e8%bf%9b%e9%98%b6%e4%ba%8c","status":"publish","type":"post","link":"https:\/\/www.poloo.org\/?p=906","title":{"rendered":"MySQL\u5f00\u53d1\u8fdb\u9636\u4e8c"},"content":{"rendered":"

1\u3001\u8bf4\u660e\uff1a\u590d\u5236\u8868(\u53ea\u590d\u5236\u7ed3\u6784,\u6e90\u8868\u540d\uff1aa \u65b0\u8868\u540d\uff1ab) (Access\u53ef\u7528)<\/span>
\n\u6cd5\u4e00\uff1aselect * into b from a where 1<>1\uff08\u4ec5\u7528\u4e8eSQlServer\uff09
\n\u6cd5\u4e8c\uff1aselect top 0 * into b from a<\/p>\n

2\u3001\u8bf4\u660e\uff1a\u62f7\u8d1d\u8868(\u62f7\u8d1d\u6570\u636e,\u6e90\u8868\u540d\uff1aa \u76ee\u6807\u8868\u540d\uff1ab) (Access\u53ef\u7528)<\/span>
\ninsert into b(a, b, c) select d,e,f from b;<\/p>\n

3\u3001\u8bf4\u660e\uff1a\u8de8\u6570\u636e\u5e93\u4e4b\u95f4\u8868\u7684\u62f7\u8d1d(\u5177\u4f53\u6570\u636e\u4f7f\u7528\u7edd\u5bf9\u8def\u5f84) (Access\u53ef\u7528)<\/span>
\ninsert into b(a, b, c) select d,e,f from b in \u2018\u5177\u4f53\u6570\u636e\u5e93\u2019 where \u6761\u4ef6
\n\u4f8b\u5b50\uff1a..from b in ‘”&Server.MapPath(“.”)&”\\data.mdb” &”‘ where..<\/p>\n

4\u3001\u8bf4\u660e\uff1a\u5b50\u67e5\u8be2(\u8868\u540d1\uff1aa \u8868\u540d2\uff1ab)<\/span>
\nselect a,b,c from a where a IN (select d from b ) \u6216\u8005: select a,b,c from a where a IN (1,2,3)<\/p>\n

5\u3001\u8bf4\u660e\uff1a\u663e\u793a\u6587\u7ae0\u3001\u63d0\u4ea4\u4eba\u548c\u6700\u540e\u56de\u590d\u65f6\u95f4<\/span>
\nselect a.title,a.username,b.adddate from table a,(select max(adddate) adddate from table where table.title=a.title) b<\/p>\n

<\/p>\n

6\u3001\u8bf4\u660e\uff1a\u5916\u8fde\u63a5\u67e5\u8be2(\u8868\u540d1\uff1aa \u8868\u540d2\uff1ab)<\/span>
\nselect a.a, a.b, a.c, b.c, b.d, b.f from a LEFT OUT JOIN b ON a.a = b.c<\/p>\n

7\u3001\u8bf4\u660e\uff1a\u5728\u7ebf\u89c6\u56fe\u67e5\u8be2(\u8868\u540d1\uff1aa )<\/span>
\nselect * from (SELECT a,b,c FROM a) T where t.a > 1;<\/p>\n

8\u3001\u8bf4\u660e\uff1abetween\u7684\u7528\u6cd5,between\u9650\u5236\u67e5\u8be2\u6570\u636e\u8303\u56f4\u65f6\u5305\u62ec\u4e86\u8fb9\u754c\u503c,not between\u4e0d\u5305\u62ec<\/span>
\nselect * from table1 where time between time1 and time2
\nselect a,b,c, from table1 where a not between \u6570\u503c1 and \u6570\u503c2<\/p>\n

9\u3001\u8bf4\u660e\uff1ain \u7684\u4f7f\u7528\u65b9\u6cd5<\/span>
\nselect * from table1 where a [not] in (\u2018\u503c1\u2019,\u2019\u503c2\u2019,\u2019\u503c4\u2019,\u2019\u503c6\u2019)<\/p>\n

10\u3001\u8bf4\u660e\uff1a\u4e24\u5f20\u5173\u8054\u8868\uff0c\u5220\u9664\u4e3b\u8868\u4e2d\u5df2\u7ecf\u5728\u526f\u8868\u4e2d\u6ca1\u6709\u7684\u4fe1\u606f<\/span>
\ndelete from table1 where not exists ( select * from table2 where table1.field1=table2.field1 )<\/p>\n

11\u3001\u8bf4\u660e\uff1a\u56db\u8868\u8054\u67e5\u95ee\u9898\uff1a<\/span>
\nselect * from a left inner join b on a.a=b.b right inner join c on a.a=c.c inner join d on a.a=d.d where …..<\/p>\n

12\u3001\u8bf4\u660e\uff1a\u65e5\u7a0b\u5b89\u6392\u63d0\u524d\u4e94\u5206\u949f\u63d0\u9192<\/span>
\nSQL: select * from \u65e5\u7a0b\u5b89\u6392 where datediff(‘minute’,f\u5f00\u59cb\u65f6\u95f4,getdate())>5<\/p>\n

13\u3001\u8bf4\u660e\uff1a\u4e00\u6761sql \u8bed\u53e5\u641e\u5b9a\u6570\u636e\u5e93\u5206\u9875<\/span>
\nselect top 10 b.* from (select top 20 \u4e3b\u952e\u5b57\u6bb5,\u6392\u5e8f\u5b57\u6bb5 from \u8868\u540d order by \u6392\u5e8f\u5b57\u6bb5 desc) a,\u8868\u540d b where b.\u4e3b\u952e\u5b57\u6bb5 = a.\u4e3b\u952e\u5b57\u6bb5 order by a.\u6392\u5e8f\u5b57\u6bb5
\n\u5177\u4f53\u5b9e\u73b0\uff1a<\/strong>
\n \u5173\u4e8e\u6570\u636e\u5e93\u5206\u9875\uff1a<\/strong><\/p>\n

declare @start int,@end int<\/p>\n

@sql nvarchar(600)<\/p>\n

set @sql=\u2019select top\u2019+str(@end-@start+1)+\u2019+from T where rid not in(select top\u2019+str(@str-1)+\u2019Rid from T where Rid>-1)\u2019<\/p>\n

exec sp_executesql @sql<\/p>\n

\u6ce8\u610f\uff1a\u5728top\u540e\u4e0d\u80fd\u76f4\u63a5\u8ddf\u4e00\u4e2a\u53d8\u91cf\uff0c\u6240\u4ee5\u5728\u5b9e\u9645\u5e94\u7528\u4e2d\u53ea\u6709\u8fd9\u6837\u7684\u8fdb\u884c\u7279\u6b8a\u7684\u5904\u7406\u3002Rid\u4e3a\u4e00\u4e2a\u6807\u8bc6\u5217\uff0c\u5982\u679ctop\u540e\u8fd8\u6709\u5177\u4f53\u7684\u5b57\u6bb5\uff0c\u8fd9\u6837\u505a\u662f\u975e\u5e38\u6709\u597d\u5904\u7684\u3002\u56e0\u4e3a\u8fd9\u6837\u53ef\u4ee5\u907f\u514d top\u7684\u5b57\u6bb5\u5982\u679c\u662f\u903b\u8f91\u7d22\u5f15\u7684\uff0c\u67e5\u8be2\u7684\u7ed3\u679c\u540e\u5b9e\u9645\u8868\u4e2d\u7684\u4e0d\u4e00\u81f4\uff08\u903b\u8f91\u7d22\u5f15\u4e2d\u7684\u6570\u636e\u6709\u53ef\u80fd\u548c\u6570\u636e\u8868\u4e2d\u7684\u4e0d\u4e00\u81f4\uff0c\u800c\u67e5\u8be2\u65f6\u5982\u679c\u5904\u5728\u7d22\u5f15\u5219\u9996\u5148\u67e5\u8be2\u7d22\u5f15\uff09<\/strong><\/p>\n

14\u3001\u8bf4\u660e\uff1a\u524d10\u6761\u8bb0\u5f55<\/span>
\nselect top 10 * form table1 where \u8303\u56f4<\/p>\n

15\u3001\u8bf4\u660e\uff1a\u9009\u62e9\u5728\u6bcf\u4e00\u7ec4b\u503c\u76f8\u540c\u7684\u6570\u636e\u4e2d\u5bf9\u5e94\u7684a\u6700\u5927\u7684\u8bb0\u5f55\u7684\u6240\u6709\u4fe1\u606f(\u7c7b\u4f3c\u8fd9\u6837\u7684\u7528\u6cd5\u53ef\u4ee5\u7528\u4e8e\u8bba\u575b\u6bcf\u6708\u6392\u884c\u699c,\u6bcf\u6708\u70ed\u9500\u4ea7\u54c1\u5206\u6790,\u6309\u79d1\u76ee\u6210\u7ee9\u6392\u540d,\u7b49\u7b49.)<\/span>
\nselect a,b,c from tablename ta where a=(select max(a) from tablename tb where tb.b=ta.b)<\/p>\n

16\u3001\u8bf4\u660e\uff1a\u5305\u62ec\u6240\u6709\u5728 TableA \u4e2d\u4f46\u4e0d\u5728 TableB\u548cTableC \u4e2d\u7684\u884c\u5e76\u6d88\u9664\u6240\u6709\u91cd\u590d\u884c\u800c\u6d3e\u751f\u51fa\u4e00\u4e2a\u7ed3\u679c\u8868<\/span>
\n(select a from tableA ) except (select a from tableB) except (select a from tableC)<\/p>\n

17\u3001\u8bf4\u660e\uff1a\u968f\u673a\u53d6\u51fa10\u6761\u6570\u636e<\/span>
\nselect top 10 * from tablename order by newid()<\/p>\n

18\u3001\u8bf4\u660e\uff1a\u968f\u673a\u9009\u62e9\u8bb0\u5f55<\/span>
\nselect newid()<\/p>\n

19\u3001\u8bf4\u660e\uff1a\u5220\u9664\u91cd\u590d\u8bb0\u5f55<\/span>
\n1),delete from tablename where id not in (select max(id) from tablename group by col1,col2,…)
\n2),select distinct * into temp from tablename
\ndelete from tablename
\ninsert into tablename select * from temp
\n\u8bc4\u4ef7\uff1a \u8fd9\u79cd\u64cd\u4f5c\u7275\u8fde\u5927\u91cf\u7684\u6570\u636e\u7684\u79fb\u52a8\uff0c\u8fd9\u79cd\u505a\u6cd5\u4e0d\u9002\u5408\u5927\u5bb9\u91cf\u4f46\u6570\u636e\u64cd\u4f5c<\/strong>
\n3),\u4f8b\u5982\uff1a\u5728\u4e00\u4e2a\u5916\u90e8\u8868\u4e2d\u5bfc\u5165\u6570\u636e\uff0c\u7531\u4e8e\u67d0\u4e9b\u539f\u56e0\u7b2c\u4e00\u6b21\u53ea\u5bfc\u5165\u4e86\u4e00\u90e8\u5206\uff0c\u4f46\u5f88\u96be\u5224\u65ad\u5177\u4f53\u4f4d\u7f6e\uff0c\u8fd9\u6837\u53ea\u6709\u5728\u4e0b\u4e00\u6b21\u5168\u90e8\u5bfc\u5165\uff0c\u8fd9\u6837\u4e5f\u5c31\u4ea7\u751f\u597d\u591a\u91cd\u590d\u7684\u5b57\u6bb5\uff0c\u600e\u6837\u5220\u9664\u91cd\u590d\u5b57\u6bb5<\/p>\n

alter table tablename
\n–\u6dfb\u52a0\u4e00\u4e2a\u81ea\u589e\u5217
\nadd column_b int identity(1,1)
\ndelete from tablename where column_b not in(
\nselect max(column_b) from tablename group by column1,column2,…)
\nalter table tablename drop column column_b<\/p>\n

20\u3001\u8bf4\u660e\uff1a\u5217\u51fa\u6570\u636e\u5e93\u91cc\u6240\u6709\u7684\u8868\u540d<\/span>
\nselect name from sysobjects where type=’U’ \/\/ U\u4ee3\u8868\u7528\u6237<\/p>\n

21\u3001\u8bf4\u660e\uff1a\u5217\u51fa\u8868\u91cc\u7684\u6240\u6709\u7684\u5217\u540d<\/span>
\nselect name from syscolumns where id=object_id(‘TableName’)<\/p>\n

22\u3001\u8bf4\u660e\uff1a\u5217\u793atype\u3001vender\u3001pcs\u5b57\u6bb5\uff0c\u4ee5type\u5b57\u6bb5\u6392\u5217\uff0ccase\u53ef\u4ee5\u65b9\u4fbf\u5730\u5b9e\u73b0\u591a\u91cd\u9009\u62e9\uff0c\u7c7b\u4f3cselect \u4e2d\u7684case\u3002<\/span>
\nselect type,sum(case vender when ‘A’ then pcs else 0 end),sum(case vender when ‘C’ then pcs else 0 end),sum(case vender when ‘B’ then pcs else 0 end) FROM tablename group by type
\n\u663e\u793a\u7ed3\u679c\uff1a
\ntype vender pcs
\n\u7535\u8111 A 1
\n\u7535\u8111 A 1
\n\u5149\u76d8 B 2
\n\u5149\u76d8 A 2
\n\u624b\u673a B 3
\n\u624b\u673a C 3<\/p>\n

23\u3001\u8bf4\u660e\uff1a\u521d\u59cb\u5316\u8868table1<\/span><\/p>\n

TRUNCATE TABLE table1<\/p>\n

24\u3001\u8bf4\u660e\uff1a\u9009\u62e9\u4ece10\u523015\u7684\u8bb0\u5f55<\/span>
\nselect top 5 * from (select top 15 * from table order by id asc) table_\u522b\u540d order by id desc<\/p>\n","protected":false},"excerpt":{"rendered":"

1\u3001\u8bf4\u660e\uff1a\u590d\u5236\u8868(\u53ea\u590d\u5236\u7ed3\u6784,\u6e90\u8868\u540d\uff1aa \u65b0\u8868\u540d\uff1ab) (Acces...<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,15],"tags":[38,143,64],"class_list":["post-906","post","type-post","status-publish","format-standard","hentry","category-DB","category-Program","tag-mysql","tag-143","tag-64"],"_links":{"self":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/906","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=906"}],"version-history":[{"count":2,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/906\/revisions"}],"predecessor-version":[{"id":916,"href":"https:\/\/www.poloo.org\/index.php?rest_route=\/wp\/v2\/posts\/906\/revisions\/916"}],"wp:attachment":[{"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=906"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=906"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.poloo.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=906"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}