语源科技BlogJava-iamnickhttp://www.blogjava.net/iamnick/zh-cnSun, 12 Apr 2026 09:40:26 GMTSun, 12 Apr 2026 09:40:26 GMT60oracle 中的 rownum http://www.blogjava.net/iamnick/archive/2007/07/23/131819.htmliamnickiamnickMon, 23 Jul 2007 02:32:00 GMThttp://www.blogjava.net/iamnick/archive/2007/07/23/131819.htmlhttp://www.blogjava.net/iamnick/comments/131819.htmlhttp://www.blogjava.net/iamnick/archive/2007/07/23/131819.html#Feedback0http://www.blogjava.net/iamnick/comments/commentRss/131819.htmlhttp://www.blogjava.net/iamnick/services/trackbacks/131819.html 1 可以查询出记录，rownum 是一个伪列从自然数1开始 如果SQL语句select * from sometable where rownum >2 不能查询出记录,rownum返回的是false 并不能查询出记录 所以要用子查询产成一个rownum，还要给rownum产生一个别名 select * form ( select rownum as num ,* from sometable ) where rownum >2 这样就可以查出结果了。。。。不过数据量大了效率不是很高 。 n-m的sql语句,必须要有主键 select t2.* from ( select tmp n-m , t1.* from ( select top n , t.* from tablename t order by t.F1 ) as t1 order by t1.F1 desc ) as t2 order by t2.F1

iamnick 2007-07-23 10:32 发表评论
]]>使用过的一些Linux命令http://www.blogjava.net/iamnick/archive/2007/07/03/127830.htmliamnickiamnickTue, 03 Jul 2007 06:17:00 GMThttp://www.blogjava.net/iamnick/archive/2007/07/03/127830.htmlhttp://www.blogjava.net/iamnick/comments/127830.htmlhttp://www.blogjava.net/iamnick/archive/2007/07/03/127830.html#Feedback0http://www.blogjava.net/iamnick/comments/commentRss/127830.htmlhttp://www.blogjava.net/iamnick/services/trackbacks/127830.html

iamnick 2007-07-03 14:17 发表评论
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