At 03:27 PM 3/16/2007, you wrote:
How to find all the values of column a in table A that are not values of
column b in table B?
Thanks
YL,
You need to do a Left Join and it will use NULL's for rows in the
second table if the row is missing.
select A.* from TableA TA left join TableB TB on TA.id=TB.Id where TB.Id is
null
http://dev.mysql.com/doc/refman/5.1/en/join.html
http://dev.mysql.com/doc/refman/5.1/en/left-join-optimization.html
Mike
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