> -----Original Message----- > From: Andre Lopes [mailto:lopes80an...@gmail.com] > Sent: Wednesday, December 08, 2010 8:16 AM > To: postgresql Forums > Subject: How to obtain the maximum value of a date, between 3 > tables... > > Hi, > > I need to obtain the maximum value of a date, but that > comparison will be made between 3 tables... I will explain > better with a query... > > [code] > select > a.last_refresh_date as d1, ae.last_refresh_date as d2, > ha.last_refresh_date as d3 from tbl1 a join tbl2 ae on > a.id_anuncio_externo = ae.id_anuncio_externo join tbl3 ha on > a.id_anuncio_externo = ha.id_anuncio_externo [/code] > > My question is how is the best way to obtain with date is the > greatest, d1, d2 or d3 > > Can you guys give me a clue. > > Best Regards, > > >
This: SELECT GREATEST(q.d1, q.d2, q.d3) FROM (select a.last_refresh_date as d1, ae.last_refresh_date as d2, ha.last_refresh_date as d3 from tbl1 a join tbl2 ae on a.id_anuncio_externo = ae.id_anuncio_externo join tbl3 ha on a.id_anuncio_externo = ha.id_anuncio_externo) q; should do it. Igor Neyman -- Sent via pgsql-general mailing list (pgsql-general@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
