库是否存在

if exists(select * from master..sysdatabases where name=N'库名')

print 'exists'

else

print 'not exists'

---------------

-- 判断要创建的表名是否存在

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)

-- 删除表

drop table [dbo].[表名]

GO

---------------

-----列是否存在

 IF COL_LENGTH( '表名','列名') IS NULL

    PRINT 'not exists'

ELSE

 PRINT 'exists'

alter table 表名 drop constraint 默认值名称

go

alter table 表名 drop column 列名

go

-----

--判断要创建临时表是否存在

If Object_Id('Tempdb.dbo.#Test') Is Not Null

Begin

print '存在'

End

Else

Begin

print '不存在'

End

---------------

-- 判断要创建的存储过程名是否存在

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[存储过程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)

-- 删除存储过程

drop procedure [dbo].[存储过程名]

GO

---------------

-- 判断要创建的视图名是否存在

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[视图名]') and OBJECTPROPERTY(id, N'IsView') = 1)

-- 删除视图

drop view [dbo].[视图名]

GO

---------------

-- 判断要创建的函数名是否存在

if exists (select * from sysobjects where xtype='fn' and name='函数名')

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函数名]') and xtype in (N'FN', N'IF', N'TF'))

-- 删除函数

drop function [dbo].[函数名]

GO

if col_length('表名', '列名') is null

print '不存在'

select 1 from sysobjects where id in (select id from syscolumns where name='列名') and name='表名'