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MERGEでINSERTしたかUPDATEしたかを知る

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OUTPUT句に**$action**を指定する

MERGE INTO table_name
    ...
WHEN MATCHED WHEN
    ...
WHEN NOT MATCHED WHEN
    ...
OUTPUT
    $action AS RESULT_STRING       -- nvarchar(10) 'INSERT' または 'UPDATE' または 'DELETE' が入る

MERGE (Transact-SQL)
OUTPUT 句 (Transact-SQL)

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