Question

好的，首先我要显示的查询非常粗糙。关于如何优化它的指针会很棒，但这不是我现在的主要目的，我需要一些有用的东西。我将发布查询和结果

    SELECT u.[UserName]
      ,u.[LoweredUserName]
      ,m.[BarCode]
      ,m.[MemberID]
      ,d.[FirstName]
      ,d.[LastName]
  FROM [sqlmdstgbiz02].[WebDB].[dbo].[aspnet_Users] u,
  [mdsqlst].[CMS_PRODUCTION].[dbo].[memMember] me,
  [mdsqlst].[CMS_PRODUCTION].[dbo].[Demographics] d,
  [sqlmd05stg\sqlmd05stg].EntranceControl.dbo.MemberBarCodes m
  where
  (substring(u.UserName, len(u.UserName)-12,13) = m.Barcode or
  substring(u.UserName, len(u.UserName)-11,12)  = m.Barcode or
  substring(u.UserName, len(u.UserName)-10,11)  = m.Barcode or
  substring(u.UserName, len(u.UserName)-9,10)  = m.Barcode or
  substring(u.UserName, len(u.UserName)-8,9) = m.Barcode) and
  me.MemberID = m.MemberID and me.DemographicsID = d.DemographicsID

代码的结果是

UserName          BarCode        MemberID      FirstName   LastName
down120000008     120000008      8300100364005 TOUCH       DOWN
test120000009     120000009      8300100606009 KET TAG     TEST
abbott123567567   123567567      8300100635008 HENRY       ABBOTT

现在您可以看到UserName很简单，Lastname和BarCode组合在一起。我需要做的是使用LastName和MemberID更新UserName，但这样可以让我用一个脚本更新数百个UserName。所有这些信息都在不同的服务器上，所以我知道我必须做一个DBA正在设置的链接服务器。有任何更多信息，请询问。

Answer 1

假设这是SQL Server，您可以使用UPDATE FROM来执行更新。

 BEGIN TRAN

 UPDATE u 
 SET    UserName = d.FirstName + m.MemberID
 OUTPUT INSERTED.*
 FROM   [sqlmdstgbiz02].[WebDB].[dbo].[aspnet_Users] u
        , [mdsqlst].[CMS_PRODUCTION].[dbo].[memMember] me
        , [mdsqlst].[CMS_PRODUCTION].[dbo].[Demographics] d
        , [sqlmd05stg\sqlmd05stg].EntranceControl.dbo.MemberBarCodes m
 WHERE  (substring(u.UserName, len(u.UserName)-12,13) = m.Barcode 
          or substring(u.UserName, len(u.UserName)-11,12)  = m.Barcode 
          or substring(u.UserName, len(u.UserName)-10,11)  = m.Barcode 
          or substring(u.UserName, len(u.UserName)-9,10)  = m.Barcode 
          or substring(u.UserName, len(u.UserName)-8,9) = m.Barcode
        ) 
        and me.MemberID = m.MemberID 
        and me.DemographicsID = d.DemographicsID

 ROLLBACK TRAN

修改

正如HLGEM正确指出的那样，你应该用适当的INNER JOIN语句替换隐式语法。

BEGIN TRAN UPDATE u SET UserName = d.FirstName + m.MemberID OUTPUT INSERTED.* FROM [mdsqlst].[CMS_PRODUCTION].[dbo].[memMember] me INNER JOIN [mdsqlst].[CMS_PRODUCTION].[dbo].[Demographics] d ON d.DemographicsID = me.DemographicsID INNER JOIN [sqlmd05stg\sqlmd05stg].EntranceControl.dbo.MemberBarCodes m ON m.MemberID = me.MemberID INNER JOIN [sqlmdstgbiz02].[WebDB].[dbo].[aspnet_Users] u ON u.UserName LIKE '%' + m.Barcode ROLLBACK TRAN

需要帮助循环查询结果以更新字段

1 个答案: