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Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

Posted on 2007-11-30
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Last Modified: 2012-06-27
What's wrong with this code?  I'm getting the above error message.  I'm trying to delete all records that are duplicates except for the one with the largest date.  


DELETE FROM NIPRLicenseInfo
WHERE (NPN IN
(SELECT NPN, State, LicenseID
FROM NIPRLicenseInfo
GROUP BY NPN, State, LicenseID
HAVING (COUNT(NPN) > 1))
AND NOT [ExpirationDate] IN (
SELECT MAX([ExpirationDate]) as MaxOfExpire
FROM NIPRLicenseInfo
GROUP BY NPN, State, LicenseID
HAVING ((COUNT(NPN))>1)))

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Question by:PSIUnit
  • 2
4 Comments
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 total points
ID: 20385463
here we go:

DELETE n
FROM NIPRLicenseInfo n
WHERE EXISTS (
   SELECT NULL 
   FROM NIPRLicenseInfo i
   WHERE i.NPN = n.NPN
     AND i.ExpirationDate > n.ExpirationDate
  )

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Author Comment

by:PSIUnit
ID: 20385496
You are so awesome.  Why didn't I think of that?  I think I always try to overcomplicate everything...  Thanks!
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Expert Comment

by:JimFive
ID: 20385508
What's wrong is:

WHERE (NPN IN
(SELECT NPN, State, LicenseID
FROM NIPRLicenseInfo

A SELECT Statment inside the IN must only return 1 field.

You need:
WHERE (NPN IN
(SELECT NPN
FROM...)
0
 

Author Comment

by:PSIUnit
ID: 20385524
Ok - that makes sense.  Thanks!
0

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