invalid 'having' clause

Hi,

Just a quick question out of curiosity, I was just wondering if this is
supposed to be valid sql:

select count(*) as cnt
from sometable
group by somecolumn
having cnt > 1

This isn't valid in pg (7.4.6), but this is:

select count(*)
from sometable
group by somecolumn
having count(*) > 1

Does anyone have any idea?

I can't remember what other databases do, and I'm not so familiar with the
standards, but I just thought I'd mention it anyway.

regards
Iain