From: Stephan Szabo <sszabo@megazone.bigpanda.com>
To: CN <cnliou9@fastmail.fm>
Cc: pgsql-sql@postgresql.org
Subject: Re: Creating Index
Date: Wed, 1 Oct 2003 11:15:27 -0700 (PDT)
Message-ID: <20031001110830.O40704@megazone.bigpanda.com> (raw)
In-Reply-To: <20031001152542.8C9C76F692@smtp.us2.messagingengine.com>
References: <Pine.LNX.4.44.0310011419060.2932-100000@peter.localdomain>
<20031001152542.8C9C76F692@smtp.us2.messagingengine.com>
On Wed, 1 Oct 2003, CN wrote:
> Peter, Thanks a lot!
>
> > Unqualified count() cannot use an index because it has to visit all the
> > rows in the table.
>
> It is only for my test. In my real practice, queries like
> "SELECT * FROM view1 WHERE year = 2003 AND month BETWEEN 10 AND 12"
> will be performed.
You do realize that extract returns a double precision value not an
integer, and it's probably not going to be willing to push clauses down
through the union where the types are different .
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To: pgsql-sql@postgresql.org
Cc: sszabo@megazone.bigpanda.com, cnliou9@fastmail.fm
Subject: Re: Creating Index
In-Reply-To: <20031001110830.O40704@megazone.bigpanda.com>
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