select a.id, a.name, a.pid, a.status, a.create_by, a.update_by, b.name fname from act_classification a left join act_classification b on a.pid = b.id
select a.id, a.name,a.type,a.ssk_id, a.pid, a.status, a.create_by, a.update_by, b.name fname from act_classification a left join act_classification b on a.pid = b.id