任何人都可以幫助我優化我的查詢嗎？

SELECT p.ID, Name 
    FROM Policies p 
     INNER JOIN ProgramYears py ON p.ProgramYearID = py.id 
     INNER JOIN (SELECT MemberID, max(EffectiveDate) AS EffectiveDate 
         FROM Policies 
        GROUP BY MemberID) TEMP 
       ON p.memberid = TEMP.MemberID 
       AND p.EffectiveDate = TEMP.effectivedate 
       AND p.memberid NOT IN (SELECT MemberID 
             FROM InvoiceDetail 
             WHERE ProgramYear = NAME)

來源

2014-05-19 Brijesh

它有什麼問題嗎？ – Magnus

它抽空時間.. 如果我執行該部分 SELECT p.ID，名稱 FROM政策p INNER JOIN ProgramYears PY ON p.ProgramYearID = py.id INNER JOIN（ SELECT MEMBERID ，最大值（EFFECTIVEDATE） AS EffectiveDate FROM Policies GROUP BY MemberID ）TEMP ON p.memberid = TEMP.MemberID AND p.EffectiveDate = TEMP.effectivedate 它需要毫秒。執行，但之後，如果我執行整個查詢需要9-10秒執行。所以我想優化它。 – Brijesh

您在指定的表格中有多少條記錄？ –

NOT EXISTS通常是NOT IN一個更好的替代品，但你的選擇在很大程度上取決於數據和表和索引的結構。

請嘗試下面的查詢，但將其執行計劃與當前查詢的執行計劃進行比較;一種情況適用的可能不適用於另一種情況。

SELECT p.ID, Name 
    FROM Policies p 
     INNER JOIN ProgramYears py ON p.ProgramYearID = py.id 
     INNER JOIN (SELECT MemberID, max(EffectiveDate) AS EffectiveDate 
         FROM Policies 
        GROUP BY MemberID) TEMP 
       ON p.memberid = TEMP.MemberID 
        AND p.EffectiveDate = TEMP.effectivedate 
    WHERE NOT EXISTS 
      (SELECT MemberID 
       FROM InvoiceDetail AS ID 
       WHERE ID.ProgramYear = NAME 
       AND p.MemberId = ID.MemberId)

來源

2014-05-19 08:10:56

謝謝先生。我的問題已解決。不存在已將執行時間從9秒減少到3-4秒。 – Brijesh

你可以試試：

SELECT a.ID, a.Name 
    FROM (SELECT p.ID, Name, 
       ROW_NUMBER()OVER(PARTITION BY p.memberid ORDER BY p.EffectiveDate DESC) AS rnk 
      FROM Policies p 
       INNER JOIN ProgramYears py ON p.ProgramYearID = py.id 
      WHERE NOT EXISTS (SELECT MemberID 
           FROM InvoiceDetail AS ID 
          WHERE ID.ProgramYear = NAME 
           AND p.MemberId = ID.MemberId) 
     ) a 
    WHERE a.rnk = 1

來源

2014-05-19 07:16:02 Justin

任何人都可以幫助我優化我的查詢嗎？

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