I Need help in optimizing the query ,Could you please throw some techniques or any valid query for replacement of this query . Help is highly appreciated as i am in dead lock to finish this . SELECT Distinct Systems.SiteNumber AS 'SiteNumber', PolicyAudit.PolicyID AS 'PolicyID', PolicyAudit.ERNExemptFlag AS 'ERNExemptFlag', CONVERT(VARCHAR(8), PolicyAudit.LastModifiedDate, 112) AS 'DateSent' FROM PolicyAudit LEFT JOIN Systems ON Systems.ID = PolicyAudit.SourceSystemID OUTER APPLY (SELECT Top(1) pa.HasERN, st.SiteNumber, pa.PolicyID, CONVERT(VARCHAR(8), pa.LastModifiedDate, 112) as 'DateSent1' , ERNExemptFlag FROM PolicyAudit pa LEFT JOIN Systems st ON st.ID = pa.SourceSystemID WHERE rtrim(ltrim(pa.PolicyID)) =PolicyAudit.PolicyID And pa.Status=1 Order By pa.ID desc ) Derived_Policy_Audit_Latest WHERE PolicyAudit.Status =1 AND PolicyAudit.HasERN = 0 AND Systems.FileTypeIndicator in ('C','V') and PolicyAudit.policyid=Derived_Policy_Audit_Latest.policyid and CONVERT(VARCHAR(8), PolicyAudit.LastModifiedDate, 112)=Derived_Policy_Audit_Latest.DateSent1 and Systems.SiteNumber=Derived_Policy_Audit_Latest.SiteNumber and Derived_Policy_Audit_Latest.HasERN=0
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