--庫(kù)是否存在if exists(select * from master..sysdatabases where name=N'庫(kù)名')print 'exists'elseprint 'not exists'----------------- 判斷要?jiǎng)?chuàng)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(rèn)值名稱goalter table 表名 drop column 列名go-------判斷要?jiǎng)?chuàng)建臨時(shí)表是否存在If Object_Id('Tempdb.dbo.#Test') Is Not NullBeginprint '存在'EndElseBeginprint '不存在'End----------------- 判斷要?jiǎng)?chuàng)建的存儲(chǔ)過(guò)程名是否存在if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[存儲(chǔ)過(guò)程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)-- 刪除存儲(chǔ)過(guò)程drop procedure [dbo].[存儲(chǔ)過(guò)程名]GO----------------- 判斷要?jiǎng)?chuàng)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?jiǎng)?chuàng)建的函數(shù)名是否存在if exists (select * from sysobjects where xtype='fn' and name='函數(shù)名')if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函數(shù)名]') and xtype in (N'FN', N'IF', N'TF'))-- 刪除函數(shù)drop function [dbo].[函數(shù)名]GOif col_length('表名', '列名') is nullprint '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(shù)據(jù)庫(kù)是否存在 if exists(select * from master..sysdatabases where name=N'庫(kù)名') print 'exists' else print 'not exists' --------------- -- 判斷要?jiǎng)?chuàng)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?jiǎng)?chuàng)建臨時(shí)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?jiǎng)?chuàng)建的存儲(chǔ)過(guò)程名是否存在 if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[存儲(chǔ)過(guò)程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1) -- 刪除存儲(chǔ)過(guò)程 drop procedure [dbo].[存儲(chǔ)過(guò)程名] GO --------------- -- 判斷要?jiǎng)?chuàng)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?jiǎng)?chuàng)建的函數(shù)名是否存在 if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函數(shù)名]') and xtype in (N'FN', N'IF', N'TF')) -- 刪除函數(shù) drop function [dbo].[函數(shù)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'