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Message Posted: Wed, 13 Oct 2004 @ 11:04:12 GMT


     
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Subj:   Can this query be written more efficient
 
From:   Anomy Anom

<-- Anonymously Posted: Tuesday, October 12, 2004 09:03 -->

Basically trying to insert into a copy tables all rows from table (except the ones that exist in mtable) + insert into table copy all the rows from mtable.

     INSERT INTO table_copy
     SELECT *
     FROM table
     WHERE (X,Y) NOT IN (SELECT DISTINCT X,Y
                         FROM Mtable)
     ;insert into table_copy
     select *
     from Mtable;

Can this query be written in a more efficient manner. It currently takes 4 hours with table, 61+ millions rows and mtable, 20+ thousands rows.


Thanks



     
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