SQL SERVER子查询错误

一旦我运行这个查询，我得到以下错误。SQL SERVER子查询错误

[email protected] int,@SearchStr2 nvarchar(200) 
SET @Type=1 
SET @SearchStr2 = 'A' 
SELECT * FROM Document WHERE DocNo in(
CASE @Type 
     WHEN 1 THEN 

     (SELECT DocNO FROM Publisher WHERE CONTAINS((PublisherName), @SearchStr2) 
     ) 
     WHEN 2 THEN 
     (SELECT DocNO FROM Publisher WHERE CONTAINS((PublishedPlace), @SearchStr2) 
     ) 
     WHEN 3 THEN 
     (SELECT DocNO FROM Publisher WHERE CONTAINS((PublishedDate), @SearchStr2) 
     ) 

     END 
    )

消息512，级别16，状态1，行4子查询返回多个1个值。当子查询遵循=，！=，<，< =，>，> =或当子查询用作表达式时，这是不允许的。

来源

2013-08-25 AComputer

其中一个或多个查询返回多于1行。

SELECT DocNO FROM Publisher WHERE CONTAINS((PublisherName), @SearchStr2) 

SELECT DocNO FROM Publisher WHERE CONTAINS((PublishedPlace), @SearchStr2) 

SELECT DocNO FROM Publisher WHERE CONTAINS((PublishedDate), @SearchStr2)

来源

2013-08-25 10:11:08

CASE @Type WHEN ... END需要评估为一个值。根据错误消息，您的子查询没有这样做。

你可能想要写的东西是这样的：

WHERE (@Type = 1 AND DocNo IN (SELECT DocNo FROM Publish WHERE <Use PublisherName>)) 
    OR (@Type = 2 AND DocNo IN (SELECT DocNo FROM Publish WHERE <Use PublishedPlace>)) 
    OR ...

来源

2013-08-25 10:16:05

SQL SERVER子查询错误

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