X-Original-To: pgsql-sql-postgresql.org@localhost.postgresql.org Received: from localhost (neptune.hub.org [200.46.204.2]) by svr1.postgresql.org (Postfix) with ESMTP id 7213BD1B45E for ; Fri, 28 Nov 2003 19:44:47 +0000 (GMT) Received: from svr1.postgresql.org ([200.46.204.71]) by localhost (neptune.hub.org [200.46.204.2]) (amavisd-new, port 10024) with ESMTP id 85908-09 for ; Fri, 28 Nov 2003 15:44:16 -0400 (AST) Received: from serwer.skawsoft.com.pl (skawina.eu.org [80.48.213.66]) by svr1.postgresql.org (Postfix) with ESMTP id DCAE5D1B4C8 for ; Fri, 28 Nov 2003 15:43:23 -0400 (AST) Received: from klaster.net (core-1.citynet.pl [80.48.135.69]) by serwer.skawsoft.com.pl (Postfix) with ESMTP id 4FAE92B3D5; Fri, 28 Nov 2003 20:43:19 +0100 (CET) Message-ID: <3FC7A565.4000104@klaster.net> Date: Fri, 28 Nov 2003 20:43:33 +0100 From: Tomasz Myrta User-Agent: Mozilla/5.0 (Windows; U; Win 9x 4.90; pl-PL; rv:1.5) Gecko/20031007 X-Accept-Language: pl, en-us, en MIME-Version: 1.0 To: Tom Lane Cc: Lista dyskusyjna pgsql-sql Subject: Re: explicit joins wrong planning References: <3FC63057.3080009@klaster.net> <29784.1070047126@sss.pgh.pa.us> In-Reply-To: <29784.1070047126@sss.pgh.pa.us> Content-Type: text/plain; charset=ISO-8859-2; format=flowed Content-Transfer-Encoding: 8bit X-Virus-Scanned: by amavisd-new at postgresql.org X-Archive-Number: 200311/312 X-Sequence-Number: 16127 Dnia 2003-11-28 20:18, Użytkownik Tom Lane napisał: > Hard to say much when you didn't actually show us the output of EXPLAIN > ANALYZE. OK, Here you are: explain analyze select * from plany pl join linia_trasy lt using (id_linii) join kursy k on (k.id_trasy=lt.id_trasy and k.event_date=pl.begindate+lt.offset) where pl.id_planu=508; event_date - date begindate - date id_linii - integer id_trasy - integer offset - integer QUERY PLAN -------------------------------------------------------------------------------------------------------------------------------------- Hash Join (cost=5.82..1210.68 rows=2 width=40) (actual time=718.11..759.27 rows=5 loops=1) Hash Cond: ("outer".id_trasy = "inner".id_trasy) Join Filter: ("outer".event_date = ("inner".begindate + "inner".offset)) -> Seq Scan on kursy k (cost=0.00..876.07 rows=58707 width=11) (actual time=0.02..547.65 rows=58707 loops=1) -> Hash (cost=5.81..5.81 rows=7 width=29) (actual time=0.43..0.43 rows=0 loops=1) -> Nested Loop (cost=0.00..5.81 rows=7 width=29) (actual time=0.16..0.37 rows=7 loops=1) Join Filter: ("outer".id_linii = "inner".id_linii) -> Index Scan using plany_pkey on plany pl (cost=0.00..4.49 rows=1 width=17) (actual time=0.09..0.11 rows=1 loops=1) Index Cond: (id_planu = 508) -> Seq Scan on linia_trasy lt (cost=0.00..1.14 rows=14 width=12) (actual time=0.02..0.12 rows=14 loops=1) If I add "and k.id_trasy=lt.id_trasy" into where clause (duplicate), the query works fine. Regards, Tomasz Myrta