This is my best effort so far is below. My concern is that it isn't very efficient and will slow down as record numbers increase
create view current_qualifications as select q.*, (q.qu_qualified+q.qu_renewal)::date as qu_expires from qualifications q join (select st_id, sk_id, max(qu_qualified) as qu_qualified from qualifications group by st_id, sk_id) s on q.st_id=s.st_id and q.sk_id = s.sk_id and q.qu_qualified = s.qu_qualified; select t.st_id, t.st_name, k.sk_id, k.sk_desc, q.qu_qualified, q.qu_renewal, q.qu_expires from current_qualifications q join staff t on t.st_id = q.st_id join skills k on k.sk_id = q.sk_id; -- Gary Stainburn Group I.T. Manager Ringways Garages http://www.ringways.co.uk -- Sent via pgsql-sql mailing list (pgsql-sql@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-sql
