question using aggregate function
Date: Tue, 17 Jul 2007 13:29:35 -0700
I'm having trouble with a query concept.
I know that:
select max(order_date) from orders;
will return the date of the newest order, and that:
select supplier_id, max(order_date) from orders group by supplier_id;
returns the newest order date from each supplier. But I'm trying to write a query that would return only the supplier_id of the most recently placed order. How would I do that? I thought maybe:
select supplier_id, max(order_date) from orders group by supplier_id having max(order_date) = order_date;
but it complains that order_date isn't a group by expression in the having clause.
Any ideas how to do this?
-MiaReceived on Tue Jul 17 2007 - 22:29:35 CEST