临时表不会从DB中删除

Question

我有一个大的查询,首先选择#tmp1.在那个select语句之前我有以下内容:

USE Sandbox

--if the table exists, we want to delete it first
IF (EXISTS (SELECT * 
                 FROM INFORMATION_SCHEMA.TABLES 
                 WHERE TABLE_SCHEMA = 'dbo' 
                 AND  TABLE_NAME = '#tmp1'))
BEGIN
    drop table dbo.#tmp1
END

问题是,当我运行整个查询时,我收到一个错误:

Msg 2714, Level 16, State 6, Line 51
There is already an object named '#tmp1' in the database.

如果我突出显示上述语句并运行它,我得到:

Command(s) completed successfully.

但是如果我再次运行查询,我会得到上面的错误.

我也试过这两个(结果"成功完成",我在尝试运行查询时仍然遇到上述错误:

if exists (select * from sys.objects where name = '#tmp1' and type = 'u')
    drop table dbo.#tmp1

IF OBJECT_ID('dbo.#tmp1', 'U') IS NOT NULL
  DROP TABLE dbo.#tmp1

任何人都可以看到我可能做错了什么？

我总共使用了4个临时表,我的大型SQL语句的结构如下:

USE Sandbox

If #tmp1 exists, drop it    
If #tmp2 exists, drop it    
If #tmp3 exists, drop it   
If #tmp4 exists, drop it

Declare variables

select into #tmp1    
select into #tmp2    
select into #tmp3    
select into #tmp4    
select from #tmp1    
select from #tmp2    
select from #tmp3    
select from #tmp4

Answer 1

临时表存在tempdb...但您当前的代码正在检查Sandbox数据库中是否存在该对象.

更改代码以使用tempdb临时表所在的三部分名称(包括数据库):

IF OBJECT_ID('tempdb.dbo.#tmp1', 'U') IS NOT NULL
  DROP TABLE dbo.#tmp1