Question

I am trying to look through two tables TableA and TableB get print out the TableA.ID of any that show more than 1 count. TableA looks like this:

ID  |  Code
------------
1   |  A
2   |  B
3   |  C

Table B Looks like

ID  |  AID |   EffectiveDate  |  ExpirationDate
------------------------------------------------
1   |  1   |  2012-01-01      |  2012-12-31
2   |  1   |  2012-01-01      |  2012-12-31
3   |  2   |  2012-01-01      |  2012-12-31
4   |  3   |  2012-01-01      |  2012-12-31

The Query I am using looks like this:

DECLARE @MoreThanOne varchar(250)
SET @MoreThanOne = ''
IF((SELECT COUNT(*) FROM TableA
WHERE EXISTS(
SELECT TableB.ID
        ,TableB.EffectiveDate
        ,TableB.ExpirationDate
     FROM TableB
     WHERE TableB.AID = TableA.ID
        and GETDATE() Between TableB.EffectiveDate and TableB.ExpirationDate
) 
GROUP BY TableA.Code) > 1)
BEGIN
--SET @MoreThanOne = @MoreThanOne + TableA.Code + CHAR(10)

END


PRINT @MoreThanOne

I know that my nested Query works when reworked it will print the counts for all in the unique codes in TableA.
I know that I can not use what I commented out because i don’t have access to TableA.Code.
My question is there another way to do this or how can I get access to TableA.Code for the Message MoreThanOne.

Thanks For the help!

Answer 1

This query will get you the codes for all AIDs that are duplicated in table B:

SELECT Code
FROM TableA
WHERE AID IN
(
    SELECT AID
    FROM TableB
    GROUP BY AID
    HAVING COUNT(*) > 1
)

You may also wish to add the WHERE condition that have in your stored procedure to the inner select.