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Message Posted: Wed, 13 Oct 2004 @ 11:40:08 GMT

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Dunno if it's any more efficient - although I suspect it will be because we've been impressed with Left Joins with a 'Where Right Hand Table column is Null' in the past - but I suspect (without testing it) that this'll do the same thing:

     INSERT INTO table_copy
     SELECT tab1.* from
     table tab1
     left join (select X,Y from Mtable Group by X,Y) as mytab
     on mytab.X=tab1.X and mytab.Y=tab1.Y
     where mytab.X IS NULL
     ;insert into table_copy
     select *
     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;
     */

Dave Clough
Database Designer
Database Design Group

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