sql;"> --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'

sql;"> --判断数据库是否存在 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'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'