From: Dan Nelson
Date: September 4 2006 4:23am
Subject: Re: problem with InnoDB
List-Archive: http://lists.mysql.com/mysql/201644
Message-Id: <20060904042323.GE93326@dan.emsphone.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii

In the last episode (Sep 04), prasad.ramisetti@stripped said:
> Actually there is some requirement, where I need to know the number
> of rows that I will get for my queries before actually executing the
> query. Could you please suggest some way for this.

Your best bet is to create an index on the smallest column you can find
(maybe even create a char(1) and leave it empty), and "SELECT COUNT(*)
FROM innotable USE INDEX (smallcolumn)".  That way mysql only has to
scan a small secondary index instead of the main table index.

-- 
	Dan Nelson
	dnelson@stripped