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

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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PSIUnit
Asked:
PSIUnit
  • 2
1 Solution
 
Guy Hengel [angelIII / a3]Billing EngineerCommented:
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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PSIUnitAuthor Commented:
You are so awesome.  Why didn't I think of that?  I think I always try to overcomplicate everything...  Thanks!
0
 
JimFiveCommented:
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
 
PSIUnitAuthor Commented:
Ok - that makes sense.  Thanks!
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