UPDATE category c

INNER JOIN

(

SELECT b.category_id FROM category a,

(SELECT * FROM category WHERE del_flag != 'D')b

WHERE a.del_flag = 'D' AND b.parent_id = a.category_id

) d

ON c.category_id = d.category_id SET c.del_flag = 'D'

update tableA a inner join tableB b on a.id = b.id set a.name = b.name