優化這個查詢

-1

的MS SQL Server 2008優化這個查詢

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SELECT Action.* 
FROM Mailing 
     INNER JOIN ActionCategoryMailingBunch 
     ON Mailing.MailingID = ActionCategoryMailingBunch.MailingID 
     INNER JOIN ActionCategory 
     ON ActionCategoryMailingBunch.ActionCategoryID = 
      ActionCategory.ActionCategoryID 
     INNER JOIN Action 
     ON ActionCategory.ActionCategoryID = Action.ActionCategoryID 
WHERE (Mailing.MailingID = 7) 
     AND (Mailing.MailingID NOT IN (SELECT MailingID 
             FROM MailingReport)) 
     AND (Action.ActionID NOT IN (SELECT ActionID 
            FROM MailingReport)) 
     AND (ActionCategoryMailingBunch.MailingBunchStatusID = 4)

尤其是該塊

(Mailing.MailingID NOT IN (SELECT MailingID FROM MailingReport)) 
AND (Action.ActionID NOT IN (SELECT ActionID FROM MailingReport))

來源

2011-05-25 mola10

如果這就是您需要的語義，然後不知道你期望我們處理您的查詢！如果您遇到性能問題，請發佈執行計劃並定義包括索引在內的所有相關表格。雖然由於您只是從Action中選擇列，您可能想使用EXISTS而不是JOIN – 2011-05-25 09:23:56

添加下面的代碼在SELECT語句

Left Join MailingReport MR on MR.ActionID = Mailing.MailingID

添加以下代碼Where子句

(MR.ActionID is null)

性能提升是由於以下塊

(Mailing.MailingID NOT IN (SELECT MailingID FROM MailingReport))

最終查詢

SELECT Action.* 
FROM Mailing 
     INNER JOIN ActionCategoryMailingBunch 
     ON Mailing.MailingID = ActionCategoryMailingBunch.MailingID 
     INNER JOIN ActionCategory 
     ON ActionCategoryMailingBunch.ActionCategoryID = 
      ActionCategory.ActionCategoryID 
     INNER JOIN Action 
     ON ActionCategory.ActionCategoryID = Action.ActionCategoryID 
     Left Join MailingReport MR on MR.ActionID = Mailing.MailingID 
WHERE (Mailing.MailingID = 7) 
     --AND (Mailing.MailingID NOT IN (SELECT MailingID 
     --        FROM MailingReport)) 
     AND 
     (MR.ActionID is null) 
     AND (Action.ActionID NOT IN (SELECT ActionID 
            FROM MailingReport)) 
     AND (ActionCategoryMailingBunch.MailingBunchStatusID = 4)

同樣可以爲第二塊性能做由於第二塊

AND (Action.ActionID NOT IN (SELECT ActionID FROM MailingReport))

最終查詢這兩個塊

SELECT Action.* 
FROM Mailing 
     INNER JOIN ActionCategoryMailingBunch 
     ON Mailing.MailingID = ActionCategoryMailingBunch.MailingID 
     INNER JOIN ActionCategory 
     ON ActionCategoryMailingBunch.ActionCategoryID = 
      ActionCategory.ActionCategoryID 
     INNER JOIN Action 
     ON ActionCategory.ActionCategoryID = Action.ActionCategoryID 
     Left Join MailingReport MR on MR.ActionID = Mailing.MailingID 
     Left Join MailingReport MRA on MRA.ActionID = Action.ActionID 
WHERE (Mailing.MailingID = 7) 
     AND 
     (MR.ActionID is null) 
     AND 
     (MRA.ActionID is null) 
     AND (ActionCategoryMailingBunch.MailingBunchStatusID = 4)

來源

2011-05-25 11:18:27 Pankaj

[將NOT IN轉換爲LEFT JOIN/IS NULL不是優化]（http://explainextended.com/2009/09/15/not-in-vs-not-exists-vs-left-join-is-null-sql-server /） – 2011-05-25 11:35:09

在過去，我有類似的問題與我的查詢。以上是解決問題的糾正措施。據我所知，In查詢在內部充當了一個循環，我在這裏避開它。 – Pankaj 2011-05-25 11:37:01

這是我過去的經歷。 – Pankaj 2011-05-25 11:47:25

優化這個查詢

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