Use MERGE JOIN statement in TSQL or dynamic sql query using Linked server and select statement

Hi Friends,
Today I had a chance to write a Merge join statement using dynamic query for linked server. The statement goes like below

Merge into targettable TT
using (Select * from ..openquery(select * from sourcetable)) ST
on tt.Date = SR.Date
When Matched
Update
When Not Matched
Insert.