T-SQL:如何加入@variable 表(另一种尝试) [英] T-SQL: How to join @variable tables (another try)

问题描述

我知道，这是这个问题的重复问题.但是我遇到了同样的问题，也许我可以提供更多可用信息.

I know, this is a duplicate question of this question. But i encountered the same problem and maybe i can provide some more available informations.

如果我尝试以下示例查询:

If i try out the following example query:

DECLARE @_Files TABLE (ID INT, Filename VARCHAR(MAX));
DECLARE @_Errors TABLE (ID INT, Label VARCHAR(MAX), Value VARCHAR(MAX));

insert into @_Files
    select 73, 'abc'

insert into @_Errors
    select 73, 'Some label name', 'Just a value'

select
    *
from
    @_Errors 
    inner join @_Files
    on @_Errors.ID = @_Files.ID

我收到错误消息:

The @_Errors-scalar variable must be declared.
The @_Files-scalar variable must be declared.

我使用的是 SQL-Server 2008 R2 Express 并且它在兼容性级别 100 下运行.那么我有什么想法为什么会出现这个错误?

I'm using SQL-Server 2008 R2 Express and it is running at compatibility level 100. So any ideas why i get this error?

推荐答案

要么给他们一个别名，然后在 JOIN 中引用，要么使用方括号.下面混合了两种可能性.

Either give them an alias that you then refer to in the JOIN or use square brackets. The below mixes both possibilities.

SELECT *
FROM   @_Errors Errors
       INNER JOIN @_Files 
         ON Errors.ID  = [@_Files].ID 

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