1、判断数据表是否存在
方法一：
use yourdb;
go
if object_id(N'tablename',N'U') is not null
print '存在'
else
print '不存在'
例如：
use fireweb;
go
if object_id(N'TEMP_TBL',N'U') is not null
print '存在'
else
print '不存在'
方法二：
USE [实例名]
GO
IF EXISTS (SELECT * FROM dbo.SysObjects WHERE ID = object_id(N'[表名]') AND OBJECTPROPERTY(ID, 'IsTable') = 1)
PRINT '存在'
ELSE
PRINT'不存在'
例如：
use fireweb;
go
IF EXISTS (SELECT * FROM dbo.SysObjects WHERE ID = object_id(N'TEMP_TBL') AND OBJECTPROPERTY(ID, 'IsTable') = 1)
PRINT '存在'
ELSE
PRINT'不存在'
2、临时表是否存在：
方法一：
use fireweb;
go
if exists(select * from tempdb..sysobjects where id=object_id('tempdb..##TEMP_TBL'))
PRINT '存在'
ELSE
PRINT'不存在'
方法二：
use fireweb;
go
if exists (select * from tempdb.dbo.sysobjects where id = object_id(N'tempdb..#TEMP_TBL') and type='U')
PRINT '存在'
ELSE
PRINT'不存在'
