SQL Server子查询语法

Question

当我运行查询时：

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

我收到错误：

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

如何正确制定此查询？

我在SQL Server 2000上

Answer 1

在最后一个括号后添加别名。

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

（注意末尾的别名）