From: Peter Brawley
Date: January 23 2006 3:49pm
Subject: Re: Comparing 2 Tables
List-Archive: http://lists.mysql.com/mysql/194141
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Andrew,

 >I need to update a table without disturing the recordset however there are
 >or could be some overlaps with data is there a way I can compare id fro
 >the same 2 tables, one new one old?

Here's one way...

SELECT 
  MIN(TableName) as TableName, id
FROM (
  SELECT 'Table a' as TableName, a.id
  FROM a
  UNION ALL
  SELECT 'Table b' as TableName, b.id
  FROM b
) AS tmp
GROUP BY id
HAVING COUNT(*) = 1
ORDER BY id;

PB



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