sql server 判断是否存在数据库，表，列，视图

1 判断数据库是否存在
if exists (select * from sys.databases where name = \'数据库名\')
drop database [数据库名]

2 判断表是否存在
if exists (select * from sysobjects where id = object_id(N\'[表名]\') and OBJECTPROPERTY(id, N\'IsUserTable\') = 1)
drop table [表名]

3 判断存储过程是否存在
if exists (select * from sysobjects where id = object_id(N\'[存储过程名]\') and OBJECTPROPERTY(id, N\'IsProcedure\') = 1)
drop procedure [存储过程名]

4 判断临时表是否存在
if object_id(\'tempdb..#临时表名\') is not null
drop table #临时表名

5 判断视图是否存在

--判断是否存在\'MyView52\'这个试图
IF EXISTS (SELECT TABLE_NAME FROM INFORMATION_SCHEMA.VIEWS WHERE TABLE_NAME = N\'MyView52\')
PRINT \'存在\'
else
PRINT \'不存在\'
6 判断函数是否存在
--  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\'))
  drop function [dbo].[函数名]

7 获取用户创建的对象信息

SELECT [name],[id],crdate FROM sysobjects where xtype=\'U\'

8 判断列是否存在
if exists(select * from syscolumns where id=object_id(\'表名\') and name=\'列名\')
alter table 表名 drop column 列名

9 判断列是否自增列
if columnproperty(object_id(\'table\'),\'col\',\'IsIdentity\')=1
  print \'自增列\'
else
  print \'不是自增列\'

SELECT * FROM sys.columns WHERE object_id=OBJECT_ID(\'表名\')  AND is_identity=1

10 判断表中是否存在索引

if exists(select * from sysindexes where id=object_id(\'表名\') and name=\'索引名\')
  print  \'存在\'
else
  print  \'不存在\'

删除索引 drop index 表名.索引名

或: drop index 索引名 on 表名(貌似2000不行)

11 查看数据库中对象

SELECT * FROM sys.sysobjects WHERE name=\'对象名\' SELECT * FROM sys.sysobjects WHERE name=\'对象名\'