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#1111

From: Schumi
Date: Mon, 05 May 2008 03:46

15 lines
1739 bytes

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����,�ڶ�������(a>20 and b<=20) or (a<=20 and b>20)�Ĳ���,�������a<=20 an
d b<=20�Ĳ���,��ָ��Ը��a desc, b desc�ķ������,����Ӧ����ν��.

����������union all�İ취���,�����Բ�ѯ����ֱ������,��ʹ�õ���top���,��sel
ect * from (select top(99.99) percent from (select * from table where ... )t
1)  order by a desc, b desc) t2 union all  select * from (select top(99.99) 
percent from (select * from table where ... )t3)  order by a desc, b desc) t
4 union all  select * from (select top(99.99) percent from (select * from ta
ble where ... )t5)  order by a desc, b desc) t6

����top()percent ������ʹ��100%����û������ʲô�취���Դﵽ���Ŀ��?
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From: Goliath.bbs@bbs.sjtu.edu.cn (Schumi)
Newsgroups: cn.bbs.comp.database
Subject: ��̸�����
Date: 05 May 2008 03:46:36 GMT
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