Improve company productivity with a Business Account.Sign Up

x
?
Solved

not exists with multiple primary keys

Posted on 2007-11-29
3
Medium Priority
?
249 Views
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
3 Comments
 
LVL 70

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 2000 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

Featured Post

Improve Your Query Performance Tuning

In this FREE six-day email course, you'll learn from Janis Griffin, Database Performance Evangelist. She'll teach 12 steps that you can use to optimize your queries as much as possible and see measurable results in your work. Get started today!

Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

Join & Write a Comment

Sometimes MS breaks things just for fun... In Access 2003, only the maximum allowable SQL string length could cause problems as you built a recordset. Now, when using string data in a WHERE clause, the 'identifier' maximum is 128 characters. So, …
Are you working to mount the dismounted Exchange 2013 database? Then the best course of action is to analyze the causes of Database issue, their probable solutions and decide for the appropriate course of action.
Viewers will learn how to use the INSERT statement to insert data into their tables. It will also introduce the NULL statement, to show them what happens when no value is giving for any given column.
This is a high-level webinar that covers the history of enterprise open source database use. It addresses both the advantages companies see in using open source database technologies, as well as the fears and reservations they might have. In this…

605 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question