sql语句集锦

一、主要是需要更新mssqlServer 的时候需要进行一些是否存在的判断，在mssql2000 和 2005 上测试没有哦问题
--//判断是表Table_UserInfo里是否有字段
if not exists(select * from syscolumns where id=object_id('Table_UserInfo') and name='Tel') begin
ALTER table Table_UserInfo add Tel varchar(200)--增加字段
--ALTER TABLE Table_UserInfo DROP COLUMN Tel--删除字段
--ALTER TABLE table_name ALTER COLUMN Tel varchar(200) --修改字段类型
end
--//判断要添加列的表Table_UserInfo中是否有主键
if exists(select 1 from sysobjects where parent_obj=object_id('Table_UserInfo') and xtype='PK') begin
select top 1 * from Table_UserInfo
end
--//判断表Table_Stat是否有索引Index_Other
IF EXISTS (SELECT * from dbo.sysindexes WHERE id = OBJECT_ID(N'[dbo].[Table_Stat]') AND name = N'Index_Other') begin
select top 1 * from Table_UserInfo
end
--// 判断是否有存储过程pr_DoStatCount
IF EXISTS (SELECT * from dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].[pr_DoStatCount]') AND OBJECTPROPERTY(id,N'IsProcedure') = 1) begin
DROP PROCEDURE [dbo].[pr_DoStatCount]
end
--判断是否有此表Table_stat_Count
IF EXISTS (SELECT * from dbo.sysobjects WHERE id = OBJECT_ID(N'[dbo].Table_stat_Count') and OBJECTPROPERTY(id, N'IsUserTable') = 1) begin
DROP PROCEDURE [dbo].[Table_stat_Count]
end