Question : Count Column

Experts,

Why is the "GapCount" field below considered "invalid" in the HAVING clause? I'm trying to select only those records where this value = 1.

Code Snippet:

         
           
           
             SELECT ogr.MemberID
,pt.PopulationTaskID
,COUNT(pt.PopulationTaskID) As GapCount
FROM OutcomeGapResult ogr
INNER JOIN PopulationTask pt ON pt.PopulationTaskID=ogr.PopulationTaskID 
LEFT OUTER JOIN [Population] p ON p.MemberID=ogr.MemberID 
WHERE pt.Active=1 
GROUP BY ogr.MemberID,pt.PopulationTaskID 
HAVING GapCount=1
ORDER BY ogr.MemberID

           
         

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Answer : Count Column

SELECT ogr.MemberID
,pt.PopulationTaskID
,COUNT(pt.PopulationTaskID) As GapCount
FROM OutcomeGapResult ogr
INNER JOIN PopulationTask pt ON pt.PopulationTaskID=ogr.PopulationTaskID
LEFT OUTER JOIN [Population] p ON p.MemberID=ogr.MemberID
WHERE pt.Active=1
GROUP BY ogr.MemberID,pt.PopulationTaskID
HAVING COUNT(pt.PopulationTaskID) =1
ORDER BY ogr.MemberID