T-SQL MERGE - finding out which action it took

Posted by IanC on Stack Overflow See other posts from Stack Overflow or by IanC
Published on 2010-12-22T08:36:39Z Indexed on 2010/12/22 8:54 UTC
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I need to know if a MERGE statement performed an INSERT. In my scenario, the insert is either 0 or 1 rows.

Test code:

DECLARE @t table (C1 int, C2 int)
DECLARE @C1 INT, @C2 INT

set @c1 = 1
set @c2 = 1

MERGE       @t as tgt
USING       (SELECT @C1, @C2) AS src (C1, C2)
ON          (tgt.C1 = src.C1)
    WHEN MATCHED AND tgt.C2 != src.C2 THEN
        UPDATE SET tgt.C2 = src.C2
    WHEN NOT MATCHED BY TARGET THEN
        INSERT VALUES (src.C1, src. C2)
    OUTPUT deleted.*, $action, inserted.*;

SELECT inserted.*

The last line doesn't compile (no scope, unlike a trigger). I can't get access to @action, or the output. Actually, I don't want any output meta data.

How can I do this?

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