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如果我可以包含表MasterStaging（临时表）中的 ID，我可以优化连接：

  • 在中包含 IDEXCEPT会扭曲结果，因为IDfromMasterStaging总是不同于StatusComparison
  • MasterStaging.ID无关紧要，只是一个自动编号，不代表客户 ID
  • SQL 旨在显示丢失的客户，无论 ID 是什么。
  • CustomerAccountNo 不是唯一编号

我怎样才能包括获取 ID 顶部优化JOIN？

这就是我要的：

与下面相同的 SQL，但我JOIN只会使用ID

) x ON e.ID = x.ID

这是我到目前为止所拥有的：

UPDATE ecl.MasterStaging 
SET NewAccount = 1
    FROM ecl.MasterStaging e WITH (NOLOCK)
    JOIN (
          SELECT  
              ISNULL(Usable, 0) AS Usable ,
              ISNULL(TypeRC, 0) AS TypeRC ,
              ISNULL(CustomerNumber, 0) AS CustomerNumber ,
              ISNULL(CustomerAccountNo, 0) AS CustomerAccountNo ,
              ISNULL(LoadProfileClass, 0) AS LoadProfileClass ,
              ISNULL(MeterNo, 0) AS MeterNo ,
              ISNULL(PrimaryPhoneNumber, 0) AS PrimaryPhoneNumber ,
              ISNULL(CustomerName1, 0) AS CustomerName1 ,
              ISNULL(ServiceAddress1, 0) AS ServiceAddress1 ,
              ISNULL(ServiceCity, 0) AS ServiceCity ,
              ISNULL(ServiceState, 0) AS ServiceState ,
              ISNULL(ServiceZip, 0) AS ServiceZip ,
              ISNULL(BillingAddress1, 0) AS BillingAddress1 ,
              ISNULL(BillingCity, 0) AS BillingCity ,
              ISNULL(BillingState, 0) AS BillingState ,
              ISNULL(substring(BillingZip, 1, 5), 0) as BillingZip ,
              ISNULL(substring(BillingZip4, 7, 4), 0) as BillingZip4
          FROM    
              ecl.MasterStaging WITH (NOLOCK)           

          EXCEPT

           SELECT  Usable ,
            TypeRC ,
            CustomerNumber ,
            CustomerAccountNo ,
            LoadProfileClass ,
            MeterNo ,
            PrimaryPhoneNumber ,
            CustomerName1 ,
            ServiceAddress1 ,                   
            ServiceCity ,
            ServiceState ,
            ServiceZip ,
            BillingAddress1 ,                   
            BillingCity ,
            BillingState ,
            BillingZip ,
            BillingZip4 
    FROM    ecl.StatusComparison  WITH (NOLOCK)
    WHERE   [Status] <> 'D'
            ) x
    ON 
            ISNULL(e.Usable,0) = x.Usable AND 
            ISNULL(e.TypeRC,0) = x.TypeRC AND 
            ISNULL(e.CustomerNumber,0) = x.CustomerNumber AND 
            ISNULL(e.CustomerAccountNo,0) = x.CustomerAccountNo AND
            ISNULL(e.LoadProfileClass,0) = x.LoadProfileClass AND
            ISNULL(e.MeterNo,0) = x.MeterNo AND
            ISNULL(e.PrimaryPhoneNumber,0) = x.PrimaryPhoneNumber AND
            ISNULL(e.CustomerName1,0) = x.CustomerName1 AND
            ISNULL(e.ServiceAddress1,0) = x.ServiceAddress1 AND 
            ISNULL(e.ServiceCity,0) = x.ServiceCity AND
            ISNULL(e.ServiceState,0) = x.ServiceState AND
            ISNULL(e.ServiceZip,0) = x.ServiceZip AND
            ISNULL(e.BillingAddress1,0) = x.BillingAddress1 AND
            ISNULL(e.BillingCity,0) = x.BillingCity AND
            ISNULL(e.BillingState,0) = x.BillingState AND
            ISNULL(e.BillingZip,0) = x.BillingZip AND
            ISNULL(e.BillingZip4,0) = x.BillingZip4
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1 回答 1

1

一个想法，但这可能并不理想：您可以在两个表上创建一个计算和持久的列，该列将计算所有列的校验和，并且您可以加入它。虽然有碰撞的风险：

（我没有测试代码，如果有错误请告诉我）：

ALTER TABLE ecl.MasterStaging
ADD hash AS CHECKSUM(Usable ,
            TypeRC ,
            CustomerNumber ,
            CustomerAccountNo ,
            LoadProfileClass ,
            MeterNo ,
            PrimaryPhoneNumber ,
            CustomerName1 ,
            ServiceAddress1 ,                   
            ServiceCity ,
            ServiceState ,
            ServiceZip ,
            BillingAddress1 ,                   
            BillingCity ,
            BillingState ,
            BillingZip ,
            BillingZip4 ) PERSISTED

缺点 ：

  • 更多存储空间
  • 插入和更新期间的更多计算
  • 您需要更改表格的结构
  • 如果您需要在 LOB 上进行比较，它将不起作用
于 2013-11-14T15:00:49.820 回答