Du behöver helt enkelt ange på vilka tabeller du ska använda DELETE .
Ta bara bort deadline rader:
DELETE `deadline` FROM `deadline` LEFT JOIN `job` ....
Ta bort deadline och job rader:
DELETE `deadline`, `job` FROM `deadline` LEFT JOIN `job` ....
Ta bara bort job rader:
DELETE `job` FROM `deadline` LEFT JOIN `job` ....