Question

The title is the question. Will be very helpful if some one can also point to a link if at all it is possible.

And also, can we use a CTE in the Merge statement? Or we need to think of an alternative like temp table or table variable?

Answer 1

The target of a merge can not be a remote table but the source can be. And you can use a CTE in the merge statement.

You can do something like this:

with S as
(
  select ID,
         Name
  from ServerName.DBName.dbo.TableName
)
merge LocalTable as T
using S
on T.ID = S.ID
when not matched then
  insert (ID, Name) values(S.UnitID, S.Name);