Sql server 2008 优化此查询

ms sql server 2008

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 )  

尤其是这个街区

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

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在select语句中添加以下代码

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

在Where子句中添加以下代码

(MR.ActionID is null)

由于以下阻塞导致性能升级

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

最终查询

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 ) 

类似地，可以对第二个块执行此操作 由于第二次阻塞而导致的性能下降

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

两个块的最终查询

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 ) 

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如果这是您在语义上需要的，那么不确定您希望我们对您的查询做什么！如果您有性能问题，请发布所有相关表（包括索引）的执行计划和定义。虽然您仅从

操作

中选择列，但您可能希望使用

存在

而不是

加入

过去我的查询也有类似的问题。以上是解决问题的纠正措施。据我所知，In查询在内部充当一个循环，我在这里避免它。这是我过去的经验。