merge into 구문 (단일 테이블)
MERGE INTO TBL ca using dual on ( ca.id = :id)
WHEN MATCHED THEN UPDATE SET {$set} WHEN NOT MATCHED THEN INSERT ({$field}) values ({$val})
—=——-
MERGE INTO TBL ca using dual on ( ca.id = :id)
WHEN MATCHED THEN UPDATE SET {$set} WHEN NOT MATCHED THEN INSERT ({$field}) values ({$val})
—=——-