select * from [Table] where Column not in (Null)

Question

I was executing this query

select CardId, CardHeader from [Card] 
where CardId not in (select CardId from RoleMap where RoleId = 2)

the output of (select CardId from RoleMap where RoleId = 2) is null

and the output is 0 rows affected

Answer 1

You can try this using left join

select CardId, CardHeader from [Card] a left join RoleMap b on a.CardId =b.CardId 
and RoleId = 2
where b.cardid is not null

Answer 2

Try this:

SELECT CardId, CardHeader 
FROM   [Card] 
WHERE  CardId NOT IN (SELECT ISNULL(CardId, 0) from RoleMap WHERE RoleId = 2)

Answer 3

use not exists

select t.* from [Card] t
where  not exists (select 1 from RoleMap t1 where RoleId = 2
                                     and t1.CardId=t.CardId)