自己留著，還把引號都轉了下=。=！換行等 格式化 呵呵 方便後面用

1 判斷資料庫是否存在

if exists (select * from sys.databases where name = '資料庫名')  
  drop database [資料庫名]  

if exists (select * from sys.databases where name = '資料庫名')
  drop database [資料庫名]

if exists (select * from sysobjects where id = object_id(N'[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)  
  drop table [表名]  
 

if exists (select * from sysobjects where id = object_id(N'[表名]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
  drop table [表名]

if exists (select * from sysobjects where id = object_id(N'[儲存過程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)  
  drop procedure [儲存過程名]  

if exists (select * from sysobjects where id = object_id(N'[儲存過程名]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
  drop procedure [儲存過程名]
 

if object_id('tempdb..#臨時表名') is not null    
  drop table #臨時表名  

if object_id('tempdb..#臨時表名') is not null  
  drop table #臨時表名 

--SQL Server 2000   
IF EXISTS (SELECT * FROM sysviews WHERE object_id = '[dbo].[檢視名]'  
--SQL Server 2005   
IF EXISTS (SELECT * FROM sys.views WHERE object_id = '[dbo].[檢視名]'  
 

--SQL Server 2000
IF EXISTS (SELECT * FROM sysviews WHERE object_id = '[dbo].[檢視名]'
--SQL Server 2005
IF EXISTS (SELECT * FROM sys.views WHERE object_id = '[dbo].[檢視名]'

--  判斷要建立的函式名是否存在    
  if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函式名]') and xtype in (N'FN', N'IF', N'TF'))    
  drop function [dbo].[函式名]    

--  判斷要建立的函式名是否存在  
  if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[函式名]') and xtype in (N'FN', N'IF', N'TF'))  
  drop function [dbo].[函式名]  

SELECT [name],[id],crdate FROM sysobjects where xtype='U'  
  
/*  
xtype 的表示引數型別，通常包括如下這些  
C = CHECK 約束  
D = 預設值或 DEFAULT 約束  
F = FOREIGN KEY 約束  
L = 日誌  
FN = 標量函式  
IF = 內嵌表函式  
P = 儲存過程  
PK = PRIMARY KEY 約束（型別是 K）  
RF = 複製篩選儲存過程  
S = 系統表  
TF = 表函式  
TR = 觸發器  
U = 使用者表  
UQ = UNIQUE 約束（型別是 K）  
V = 檢視  
X = 擴充套件儲存過程  
*/  SELECT [name],[id],crdate FROM sysobjects where xtype='U'
/*
xtype 的表示引數型別，通常包括如下這些
C = CHECK 約束
D = 預設值或 DEFAULT 約束
F = FOREIGN KEY 約束
L = 日誌
FN = 標量函式
IF = 內嵌表函式
P = 儲存過程
PK = PRIMARY KEY 約束（型別是 K）
RF = 複製篩選儲存過程
S = 系統表
TF = 表函式
TR = 觸發器
U = 使用者表
UQ = UNIQUE 約束（型別是 K）
V = 檢視
X = 擴充套件儲存過程
*/

if exists(select * from syscolumns where id=object_id('表名') and name='列名')  
  alter table 表名 drop column 列名  

if exists(select * from syscolumns where id=object_id('表名') and name='列名')
  alter table 表名 drop column 列名

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  

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

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

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

SELECT * FROM sys.sysobjects WHERE name='物件名'  SELECT * FROM sys.sysobjects WHERE name='物件名'