Re: Can I do this using SQL?

dhruv schrieb:
> Hi,
> Thanks a lot! Ok, so let me get this straight... If I have a count(),
> min(), max, avg() on the projection list, then I can use it with group
> by and the aggregate will be applied on EACH GROUP? Also, is ORDER BY
> always applied last(on the final result set).
>
> Also, if I have a HAVING clause, will it too be applied on each GROUP?
>
> If so, then can I always emulate HAVING by using subqueries, by
> projecting the fields after the HAVING keyword, and putting the
> condition after the HAVING keyword in the WHERE of the outher select?
>
If you think it's too complex, do a nested query. Something like

select branch, branchcardinality

	from
		(
		select branch, count(cust_id) as branchcardinality
			from customers
			group by branch
		)
	order by branchcardinality desc

Probably easier to recognize in six months.

Lots of Greetings!
Volker Received on Thu Feb 09 2006 - 16:34:02 CET