From: Victor Pendleton
Date: July 9 2004 3:49pm
Subject: RE: anyone help with this query? Returning tooooo many results
List-Archive: http://lists.mysql.com/mysql/168779
Message-Id: <4810C017B52BD4118EEA00B0D020B0ED0F69E7EE@gamma.hoovers.com>
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It sounds like a cartesian join. Have you run an explain plan on this query?
What are you joining the two tables on?

-----Original Message-----
From: Aaron Wolski
To: mysql@stripped
Sent: 7/9/04 10:33 AM
Subject: anyone help with this query? Returning tooooo many results

Hi all,

Having a problem with a query that's returning 486,057 results when it
most definitely should NOT be doing that.

I have two tables:

1 for a list of customers that purchase product A, another for customers
who purchased product B.

Columns are:

Id
First
Last
Email

I am trying to compare table 1 to table 2 to get a result set that gives
me the contact info (table columns) for those whose email addresses in
table 1 DON'T EQUAL those in table two.

In table one I have 2026 records
In table two I have 240 records

The query is this:

SELECT * FROM producta_customers AS t1, productb_customers AS t2 WHERE
t1.email != t2.email

When I do this query. I get 486,057 results returne.

Where am I going wrong? Any ideas?

Thanks so much for the help!

Aaron



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