Thursday, 19 February 2015

Loop within Recursive Query

create table t
( id        number
, parent_id number
);
insert into t values (1, 2);
insert into t values (2, 1);
commit;
with tr (id,parent_id) as
( select id
       , parent_id
    from t
   where id = 1
   union all
  select t.id
       , t.parent_id
    from t
         join tr on t.parent_id = tr.id
) cycle id set is_cycle to '1' default '0'
select id
     , parent_id
     , is_cycle
  from tr;

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