Table triggers in PostgreSQL

select trg.tgname,
       CASE trg.tgtype::integer & 66
           WHEN 2 THEN 'BEFORE'
           WHEN 64 THEN 'INSTEAD OF'
           ELSE 'AFTER'
       end as trigger_type,
        case trg.tgtype::integer & cast(28 as int2)
         when 16 then 'UPDATE'
         when 8  then 'DELETE'
         when 4  then 'INSERT'
         when 20 then 'INSERT, UPDATE'
         when 28 then 'INSERT, UPDATE, DELETE'
         when 24 then 'UPDATE, DELETE'
         when 12 then 'INSERT, DELETE'
       end as trigger_event,
      ns.nspname||'.'||tbl.relname as trigger_table,
      ns.nspname,
      obj_description(trg.oid) as remarks,
        case
         when trg.tgenabled='O' then 'ENABLED'
           else 'DISABLED'
       end as status,
       case trg.tgtype::integer & 1
         when 1 then 'ROW'::text
         else 'STATEMENT'::text
       end as trigger_level,
       trg.oid 
FROM pg_trigger trg
JOIN pg_class tbl on trg.tgrelid = tbl.oid
JOIN pg_namespace ns ON ns.oid = tbl.relnamespace
 WHERE  trg.tgrelid = $$TABLEOID