1.查询哪些数据库对象使用了某个表
SELECT b.[name], a.[definition] FROM sys.all_sql_modules a, sysobjects b WHERE a.[object_id] = id AND definition LIKE ‘%表名%‘
2.查询表的某一列，将结果变成用逗号分隔的字符串
select col+‘,‘ from mytable for xml path(‘‘)
3.查询有哪些表的表名包含“storeroom”
select * from sysobjects obj where LOWER(obj.name) LIKE N‘%storeroom%‘ and xtype=‘U‘
4.分组条件求和
DECLARE @t1 TABLE ( c1 NUMERIC (12), c2 VARCHAR (30) ) INSERT INTO @t1 (c1, c2) VALUES (1, ‘a‘); INSERT INTO @t1 (c1, c2) VALUES (2, ‘a‘); INSERT INTO @t1 (c1, c2) VALUES (3, ‘b‘); INSERT INTO @t1 (c1, c2) VALUES (4, ‘b‘); SELECT CASE WHEN max (c1) > 3 THEN sum (c1) ELSE 0 END AS c FROM @t1 GROUP BY c2; /* 结果: c 0 7 */
x.待续
原文：http://www.cnblogs.com/CodingArt/p/3863583.html