Count on a subquery

[Jehan Jaleel]

Hi all,
Is it possible in SQL to do a count on a subquery? For example..

select parent_name , count (select child_id from child a where a.id = p.id) from parent p group by parent_name

I know that SQL is wrong. It is meant only to be psuedo-code, but I hope you get the idea.

Thanks for any help.

[Campbell Ritchie]

Not sure, but I think yes.

[Jan Cumps]

Can you try

select p.parent_name , (select count (a.child_id) from child a where a.id = p.id) from parent p




attention: untested.

[Jeanne Boyarsky]

This works in postgresql. Not sure if it would work in all databases, but it is fast to try in yours.

  select forum_id, (select count(*) from jforum_posts) from jforum_forums group by forum_id;