如何使用 MERGE 或 Upsert Sql 语句

Question

我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 的列名，其他列值发生变化，但 MachineName 没有变化。如果列 MachineName 发生变化，我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？请帮忙

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);

Answer 1

您可以在临时 table 中加载新的机器数据，然后可以使用 Merge 语句如下所示更新机器 table 中已有记录的记录，并将插入如果机器 table.

中不存在新记录

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);

Answer 2

我过去曾取得过成功"Selecting" 将值更新到 MERGE 命令的 USING 部分：

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

如何使用 MERGE 或 Upsert Sql 语句

How to use MERGE or Upsert Sql statement

sql

sql-server

merge

upsert

sql-update