From: Jose Antonio Leo <jaleo8@storelandia.com>
To: pgsql-general@postgresql.org
To: pgsql-sql@postgresql.org
Subject: problem with the Index
Date: Wed, 9 Oct 2002 18:56:41 +0200
Message-ID: <AEEGKNMMPPBJJDLEJDODEEEMCJAA.jaleo8@storelandia.com> (raw)
In-Reply-To: <19697.1034170370@sss.pgh.pa.us>
I have a problem with the index of 1 table.
I hava a table created :
CREATE TABLE "acucliart" (
"cod_pto" numeric(8,0) NOT NULL,
"cod_cli" varchar(9) NOT NULL,
"mes" numeric(2,0) NOT NULL,
"ano" numeric(4,0) NOT NULL,
"int_art" numeric(5,0) NOT NULL,
"cantidad" numeric(12,2),
"ven_siv_to" numeric(14,2),
"ven_civ_to" numeric(14,2),
"tic_siv_to" numeric(14,2),
"tic_civ_to" numeric(14,2),
"visitas" numeric(2,0),
"ult_vis" date,
"ven_cos" numeric(12,2),
"ven_ofe" numeric(12,2),
"cos_ofe" numeric(12,2),
CONSTRAINT "acucliart_pkey"
PRIMARY KEY ("cod_cli")
);
if i do this select:
explain select * from acucliart where cod_cli=10000;
postgres use the index
NOTICE: QUERY PLAN:
Index Scan using cod_cli_ukey on acucliart (cost=0.00..4.82 rows=1
width=478)
and this select
explain select * from acucliart where cod_cli>10000;
Postgres don't use the index:
NOTICE: QUERY PLAN:
Seq Scan on acucliart (cost=0.00..22.50 rows=333 width=478)
why?
tk
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To: pgsql-sql@postgresql.org
Cc: jaleo8@storelandia.com, pgsql-general@postgresql.org
Subject: Re: problem with the Index
In-Reply-To: <AEEGKNMMPPBJJDLEJDODEEEMCJAA.jaleo8@storelandia.com>
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