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/*
* Source URL: http://jonsion.javaeye.com/blog/511584
*/
1. »ñÈ¡ËùÓÐÊý¾Ý¿âÃû
1> SELECT name from master..sysdatabases;
2> go
2. »ñÈ¡ËùÓбíÃû
1> USE master
2> go
1> SELECT name from sysobjects WHERE type='U';
2> go
3. »ñÈ¡ËùÓÐ×Ö¶ÎÃû
1> SELECT name from syscolumns WHERE id=object_id('table_name');
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--»ñµÃµ±Ç°ËùÓÐÇý¶¯Æ÷
exec master.dbo.xp_availablemedia
--»ñµÃ×ÓĿ¼Áбí
exec master.dbo.xp_subdirs 'c:\'
--»ñµÃËùÓÐ×ÓĿ¼µÄĿ¼Ê÷½á¹¹
exec master.dbo.xp_dirtree 'c:\'
--¶©ÔÄÎļþɾ³ý
declare @tempTable table (Cont varchar(50))
declare @strTemp varchar(50)
declare @dirPath varchar(50)
declar ......
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ÀýÈç ¼ÆËãIDΪ 6 µÄ ºÏ¼Æ ¼õÈ¥ ID Ϊ 2¡¢3¡¢4 ÒÔ¼°¼ÓÉÏ ID Ϊ 5 µÄºÏ¼Æ
SELECT SUM(R) AS ½á¹û
from
(
SELECT ºÏ¼Æ AS R from T1 WHERE (ID = 6) UNION
SELECT -ºÏ¼Æ AS R from T1 WHERE (ID = 2) UNION
SELECT -ºÏ¼Æ AS R f ......