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A better way?

Author

Topic

bloushi
Starting Member

1 Post

Posted - 2009-04-12 : 01:55:04

Hello Everybody...

I would like some help with this query. I want to avoid three index scans on this relatively huge table. Any better ways to do it?


SELECT aa.AssessmentId,aa.QuestionId, aa.PointsObtained,o.OrganizationId, o.CountryId
FROM (
SELECT AssessmentId, QuestionId, PointsObtained, ROW_NUMBER() OVER(PARTITION BY QuestionId ORDER BY PointsObtained DESC, AssessmentId Desc) as RowNumber
FROM AssessmentAnswers
) as aa 
JOIN Assessments AS a ON aa.AssessmentId = a.AssessmentId
JOIN Organizations AS o ON a.OrganizationId = o.OrganizationId
WHERE aa.RowNumber  = 1
ORDER BY QuestionId

I would appreciate any suggestions. Thanks.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2009-04-12 : 13:23:53

which table is index scans happening? which columns are indexes on?

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