From: Baron Schwartz (baronxaprb.com)
Date: Fri Oct 26 2007 - 10:42:12 CDT

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Aaron Fischer wrote:
> Greetings!
>
> I have a problem that it seems would best be solved using subqueries.
> However, I am working on a server that is running MySQL 3.23.58, so
> subqueries are not available to me.
>
> What I am trying to do:
> I have two tables, each containing approximately 37,000 records. I want
> to compare the index field in Table A to the index field in Table B. I
> would like to see all records where the index in Table A does not exist
> in Table B.

Use an "exclusion join:"

SELECT ...
FROM tblA
    LEFT OUTER JOIN tblB ON col=col
WHERE tblB.col IS NULL;

Baron

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