Question

我想我一直在看这个陈述太久了。谁能告诉我为什么这个声明的更新部分没有更新？我认为通过在列上使用or和!=进行测试，这应该仅在需要时调用更新的原因 - 相反，我似乎无意中创建了一个条件..更新永远不会需要！

在查看声明之前，有四件事需要了解：
1.临时表#Facilities中的数据填充了来自多个源的最新数据。此数据包含bot new（ insert ）和更改（ update ）数据。
2.在执行Merge语句之前，已验证#Facilities的内容是否包含数据 3.合并声明的插入部分成功 4.虽然语句的更新部分不更新已更改的数据，但该语句不会失败。

MERGE INTO PhoneMaster AS facilitymaster
 USING #Facilities as facilitynew
   ON facilitymaster.facilityid = facilitynew.facilityid
    AND facilitymaster.siteid = facilitynew.siteid
     WHEN MATCHED AND 
     (
       facilitymaster.User__bID != facilitynew.User__bID
    or facilitymaster.Email__baddress != facilitynew.Email__baddress
    or facilitymaster.Facility__bName != facilitynew.Facility__bName
    or facilitymaster.Division != facilitynew.Division
    or facilitymaster.District != facilitynew.District
      ) THEN
    UPDATE SET
     facilitymaster.User__bID = facilitynew.User__bID,
     facilitymaster.Email__baddress = facilitynew.Email__baddress,
     facilitymaster.Facility__bName = facilitynew.Facility__bName,
     facilitymaster.Division = facilitynew.Division,
     facilitymaster.District = facilitynew.District
     WHEN NOT MATCHED THEN
  INSERT
  ( User__bID,
    Email__baddress,
    Facility__bName,
    Division,
    District,
            FacilityId,
    SiteId

  )
  VALUES
  (
    facilitynew.User__bID,
    facilitynew.Email__baddress,
    facilitynew.Facility__bName,
    facilitynew.Division,
    facilitynew.District,
            facilitynew.FacilityId,
    facilitynew.SiteId

 );

Answer 1

我注意到的一件事是你的插入语句没有填充FacilityID或SiteID。我要提出的另一个建议是在WHEN MATCHED上注释你的'AND'条款，一次加入一行直到它失败。我一直使用MERGE，它非常快速有效。

SQL Server：Merge Statement的更新部分无效

1 个答案: