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我想我已经看这个声明太久了。谁能告诉我为什么这个声明的更新部分没有更新？我认为通过在列上进行测试or，!=这应该只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......永远不需要更新！

在查看语句之前，需要了解以下 4 件事：
1. 临时表#Facilities 中的数据填充了来自多个来源的最新数据。此数据包含机器人新（插入）和更改（更新）数据。
2. 在执行 Merge 语句之前，#Facilities 的内容已被验证包含数据。
3. 合并语句的插入部分成功。
4. 虽然语句的更新部分不会更新更改的数据，但语句不会失败。

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

 );
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1 回答 1

1

我注意到的一件事是您的插入语句没有填充 FacilityID 或 SiteID。我会提出的另一个建议是在 WHEN MATCHED 上注释掉您的“AND”子句，一次添加一行，直到它失败。我一直在使用 MERGE，它非常快速高效。

于 2013-05-13T20:58:10.040 回答