Merge two Table in SQL Server 2008

Question

I have 2 table one is a Stage table whose schema is exac to main,i want to update the data from stage table to main table with the ID column as refrential key. I have tried

Answer 1

You can refer to the merge source in the insert part, like:

when not matched then insert
  (id, name, email_id) 
  values (stage.id, stage.name, stage.email_id)