--数据库是否存在

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

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

--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 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'