SQL Server：更新一列，如果不存在则插入

Question

I have a table TableKats that looks like this:

ID - int 
Name - varchar
KatID - int 

What I want to do is to update the column Name from another table, and if there is a name in the other table that doesn't exist in TableKats , it should insert it and give KatID a 0

Does anybody know a way to do that? Thanks

Answer 1

you can do it using MERGE, as your other table schema is not known assuming Name as the column in other table too

MERGE TableKats T
USING ( SELECT * from TableB) AS S
ON T.Name = S.Name
WHEN NOT MATCHED THEN
  INSERT ( Name, KatID)
  VALUES ( S.Name, 0)
WHEN MATCHED THEN
  UDPATE  -- Not clear what needs to be updated.