如何使用MERGE或Upsert Sql语句 [英] How to use MERGE or Upsert Sql statement

问题描述

如何为下面的代码使用MERGE Sql语句或UPDATE语句.我有一个名为MachineName的columnName，其他列值发生了变化，但是MachineName却没有变化.如果列MachineName更改，则需要在第二行中插入新值.如果不是，我需要更新同一行.我怎样才能做到这一点.这是正确的方法吗?请帮助

How can i use MERGE Sql Statement or UPDATE statement for my below code. I am having a columnName called MachineName, other column values change but MachineName doesnot change. If the Column MachineName changes i need to insert the new values in a secondrow. If not i need to Update the same row. How can i do this. Is it a right approach ? Please help

MERGE INTO [devLaserViso].[dbo].[Machine] WITH (HOLDLOCK) 
USING [devLaserViso].[dbo].[Machine] 
ON (MachineName = MachineName)
  WHEN MATCHED 
       THEN UPDATE SET MachineName = L1,ProgramName= ancdh.pgm, TotalCount= 10, RightCount=4, 
                       LeftCount= 3,ErrorCode=0,FinishingTime=fsefsefef
  WHEN NOT MATCHED 
       THEN INSERT (MachineName, ProgramName, TotalCount, RightCount, LeftCount, ErrorCode, FinishingTime) 
            VALUES (L02, djiwdn.pgm, 11, 5, 4, 0, dnwdnwoin);

推荐答案

您可以将新的Machine数据加载到Temporary表中，然后可以使用Merge语句来更新Machine中已经有记录的记录表，如果机器表中不存在该记录，则会插入一条新记录.

You can load the new Machine data in a Temporary table and then can use the Merge statement as follows to update the records for which there is already a record in Machine table and will insert a new record if it does not exists in Machine table.

MERGE [devLaserViso].[dbo].[Machine] t WITH (HOLDLOCK) 
USING [devLaserViso].[dbo].[TempMachine] s
ON (s.MachineName = t.MachineName)
WHEN MATCHED THEN 
UPDATE SET t.MachineName = s.MachineName,t.ProgramName =s.ProgramName
WHEN NOT MATCHED BY TARGET THEN INSERT (MachineName,ProgramName) VALUES (s.MachineName, s.ProgramName);

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