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sintassi per MERGE/upsert a riga singola in SQL Server

finalmente ho ottenuto la sintassi Upsert usando MERGE in SQL Server 2008. Utilizzando ciò che Jacob voleva da fare (un Upsert):

IF EXISTS(SELECT * FROM member_topic WHERE mt_member = 0 AND mt_topic = 110)
BEGIN
    --update existing row
    UPDATE member_topic SET mt_notes = 'test'
    WHERE mt_member = 0
    AND mt_topic = 110
END
ELSE
BEGIN
    --insert new row
    INSERT INTO member_topic (mt_member, mt_topic, mt_notes)
    VALUES (0, 110, 'test')
END

L'equivalente MERGE la sintassi è:

MERGE member_topic
USING ( 
    VALUES (0, 110, 'test')
) AS foo (mt_member, mt_topic, mt_notes) 
ON member_topic.mt_member = foo.mt_member 
   AND member_topic.mt_topic = foo.mt_topic
WHEN MATCHED THEN
   UPDATE SET mt_notes = foo.mt_notes
WHEN NOT MATCHED THEN
   INSERT (mt_member, mt_topic, mt_notes)
   VALUES (foo.mt_member, foo.mt_topic, foo.mt_notes)
; --A MERGE statement must be terminated by a semi-colon (;).