--庫是否存在
if exists(select * from master..sysdatabases where name=N'庫名')
print 'exists'
else
print 'not exists'
---------------
-- 判斷要創建的表名是否存在
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
-- 刪除表
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 默認值名稱
go
alter table 表名 drop column 列名
go
-----
--判斷要創建臨時表是否存在
If Object_Id('Tempdb.dbo.#Test') Is Not Null
Begin
print '存在'
End
Else
Begin
print '不存在'
End
---------------
-- 判斷要創建的存儲過程名是否存在
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[存儲過程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
-- 刪除存儲過程
drop procedure [dbo].[存儲過程名]
GO
---------------
-- 判斷要創建的視圖名是否存在
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[視圖名]') and OBJECTPROPERTY(id, N'IsView') = 1)
-- 刪除視圖
drop view [dbo].[視圖名]
GO
---------------
-- 判斷要創建的函數名是否存在
if exists (select * from sysobjects where xtype='fn' and name='函數名')
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函數名]') and xtype in (N'FN', N'IF', N'TF'))
-- 刪除函數
drop function [dbo].[函數名]
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'

--判斷數據庫是否存在 
if exists(select * from master..sysdatabases where name=N'庫名') 
print 'exists' 
else 
print 'not exists' 

--------------- 
-- 判斷要創建的表名是否存在 
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1) 
-- 刪除表 
drop table [dbo].[表名] 
GO 

--------------- 
--判斷要創建臨時表是否存在 
If Object_Id('Tempdb.dbo.#Test') Is Not Null 
Begin 
print '存在' 
End 
Else 
Begin 
print '不存在' 
End 

--------------- 
-- 判斷要創建的存儲過程名是否存在 
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[存儲過程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) 
-- 刪除存儲過程 
drop procedure [dbo].[存儲過程名] 
GO 

--------------- 
-- 判斷要創建的視圖名是否存在 
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[視圖名]') and OBJECTPROPERTY(id, N'IsView') = 1) 
-- 刪除視圖 
drop view [dbo].[視圖名] 
GO 

--------------- 
-- 判斷要創建的函數名是否存在 
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函數名]') and xtype in (N'FN', N'IF', N'TF')) 
-- 刪除函數 
drop function [dbo].[函數名] 
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'