Using output to set a variable in a merge statement

Question

I have a merge statement that should update or insert a single record always. I want to remember the ID of that statement in a variable. It looks like this:

DECL         


        

Answer 1

No, you have to use a table variable with OUTPUT

However, you can do this...

...
WHEN MATCHED THEN 
    UPDATE
    SET
       @int = ID,
       somecolumn = 'something'
WHEN NOT MATCHED THEN
    INSERT 
    VALUES ('stringtomatch',
        'something');

SET @int = ISNULL(@int, SCOPE_IDENTITY());

The "assign in UPDATE" has been a valid syntax for SQL Server for a long time. See MERGE on MSDN too. Both say this:

...
::=

SET
...
@variable=expression