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not exists with multiple primary keys

Posted on 2007-11-29
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Last Modified: 2010-04-21
Hi,
  I want to write a store procedure to delete the records in Table A not in Table B. Table A and Table B have the same primary keys. Since both of them use multiple primary keys, the following code doesn't work correctly.

delete from A
      where not exists
      (select
            B.*
       from B
       inner join A
       on
            A.k1= B.k1 and A.k2= B.k2 and
            A.k3= B.k3 and A.k4= B.k4 and A.k5= B.k5 and A.k6 = B.k6
      )

Many thanks,
0
Comment
Question by:Jinghui Li
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3 Comments
 
LVL 69

Expert Comment

by:Scott Pletcher
ID: 20374463
DELETE FROM A
FROM A
LEFT OUTER JOIN B ON A.k1= B.k1 and A.k2= B.k2 and
            A.k3= B.k3 and A.k4= B.k4 and A.k5= B.k5 and A.k6 = B.k6
WHERE B.k1 IS NULL
0
 
LVL 22

Accepted Solution

by:
dportas earned 500 total points
ID: 20374558
You were very close I think, but the extra reference to A was the problem (your subquery wasn't correlated because of it).

Untested. Make sure you test this out and have a backup and before you try it for real!

delete from A
      where not exists
      (select
            B.*
       from B
       where
            A.k1= B.k1 and A.k2= B.k2 and
            A.k3= B.k3 and A.k4= B.k4 and A.k5= B.k5 and A.k6 = B.k6
      );
0
 

Author Closing Comment

by:Jinghui Li
ID: 31411684
I tried it. It works fine.
Thank you very much,
0

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