At 9:41 AM -0700 5/30/01, Richard Reina wrote:
>I am stuck on a select query and was wondering if someone could help. I
>have I've written a database app. that helps me run my business
>(trucking). I need however to write a query that shows me all of the
>loads that are delivered but not billed (invoiced). Which means that I
>have to select the loads that are delivered but do not have an entry in
>the INVOICED table -- since an entry is made in the INVOICED table
>whenever a load is billed.
>I know the query below won't work. Can someone please help me fix it?
>SELECT l.load_no l.date FROM loads l, invoiced i
>WHERE l.dlvr_date > 0
>AND l.load_no != i.load_no
This is a job for LEFT JOIN.
SELECT l.load_no, l.date
FROM loads l LEFT JOIN invoiced i ON l.load_no = i.load_no
WHERE i.load_no IS NULL
Paul DuBois, paul@stripped