From: Michael Glaesemann <grzm@seespotcode.net>
To: operationsengineer1@yahoo.com
Cc: pgsql-sql@postgresql.org <pgsql-sql@postgresql.org>
Subject: Re: SQL Technique Question
Date: Fri, 16 Jun 2006 07:34:11 +0900
Message-ID: <E3A6EDE7-520B-4B19-B688-2F489EA6F0B0@seespotcode.net> (raw)
In-Reply-To: <20060615221553.74364.qmail@web33302.mail.mud.yahoo.com>
References: <20060615221553.74364.qmail@web33302.mail.mud.yahoo.com>
[Please quote responsibly. There was no need to quote my entire
message back to the list.]
On Jun 16, 2006, at 7:15 , <operationsengineer1@yahoo.com> wrote:
> i need to become mor familiar with views. if i use
> views, will i substantially impair performance?
Short answer: maybe, maybe not
Long answer: benchmark and compare. EXPLAIN ANALYZE is your friend.
For example, compare the EXPLAIN ANALYZE output using the view and
using the whole, explicit query. You'll learn a lot that will only
help you write better queries.
Michael Glaesemann
grzm seespotcode net
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To: pgsql-sql@postgresql.org
Cc: grzm@seespotcode.net, operationsengineer1@yahoo.com
Subject: Re: SQL Technique Question
In-Reply-To: <E3A6EDE7-520B-4B19-B688-2F489EA6F0B0@seespotcode.net>
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