From: Mihail Nasedkin <m.nasedkin.perm@mail.ru>
To: pgsql-sql@postgresql.org
Subject: index scan
Date: Mon, 21 Mar 2005 13:26:21 +0500
Message-ID: <10520036015.20050321132621@mail.ru> (raw)
Hello, pgsql-sql.
I have customize simple query with join two tables:
xxxx=# \d sites Таблица "public.sites" Колонка | Тип | Модификаторы
---------+------------------------+-----------------------
name | character varying(255) | not null
rem | text |
enabled | boolean | not null default true
Index:
"pk_sites" primary key, btree (oid)
xxxx=# \d site_screens
-------------+------------------------+--------------
id_site | oid | not null
screen_name | character varying(255) | not null
screen_code | text |
Foreign keys:
"$1" FOREIGN KEY (id_site) REFERENCES sites(oid)
xxxx=# explain select * from sites s join site_screens ss on s.oid = ss.id_site; QUERY PLAN ---------------------------------------------------------------------------
Hash Join (cost=...)
Hash Cond: ("outer".id_site = "inner".oid)
-> Seq Scan on site_screens ss (cost=...)
-> Hash (cost=...)
-> Seq Scan on sites s (cost=...)
I want to Index Scan. What must I do?
--
Regards,
Mihail Nasedkin
mailto:m.nasedkin.perm@mail.ru
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To: pgsql-sql@postgresql.org
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Subject: Re: index scan
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