SQL Server的子查詢語法

Question

當我運行查詢：

select count(*) from 
(select idCover from x90..dimCover group by idCover having count(*) > 1) 

我得到的錯誤：

Server: Msg 170, Level 15, State 1, Line 2 
Line 2: Incorrect syntax near ')' 

如何正確制定此查詢？

我的SQL Server 2000

Answer 1

你的最後括號後面添加一個別名。

select count(*) from 
(select idCover from x90..dimCover group by idCover having count(*) > 1) a 

Answer 2

SELECT COUNT (*) FROM 
(SELECT IdCover FROM x90..dimCover group by idCover having count(*) > 1) AS a 

（注意最後的別名）