SQL Server subquery syntax

Question

When I run the query :

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

I get the error :

Answer 1

Add an alias after your last bracket.

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

(note the alias at the end)