Encountered an error "PLS-00103: Encountered the symbol "CREATE" when expec

Question

HI All,
I am creating a procedure and trying to use temp table...
Here is the code":
PROCEDURE P_PARENT_TREE
topic_id_in           IN NUMBER,
topic_hierarchy_details_out     OUT SYS_REFCURSOR
) IS
temp_children_level topic_children.children_level%TYPE;
temp_children_id topic_children.children_id%TYPE;
temp_topic_id topic.topic_id%TYPE;
CURSOR c_child_level IS
SELECT children_level, children_id
FROM topic_children
WHERE children_id = topic_id_in;
BEGIN
OPEN c_child_level;
FETCH c_child_level INTO temp_children_level,temp_topic_id ;
CLOSE c_child_level;
CREATE TEMPORARY TABLE IF NOT EXISTS topic_child
(t_topic_id NUMBER, t_children_id NUMBER, children_seq NUMBER);
WHILE temp_children_level > 0
LOOP
INSERT INTO topic_child(t_topic_id,t_children_id,children_seq)
values (
SELECT topic_id , children_id ,children_level
FROM topic_children
WHERE children_id = temp_topic_id);
temp_children_level := temp_children_level - 1;
END LOOP;
OPEN topic_hierarchy_details_out FOR
select * from topic_child;
END P_PARENT_TREE;
END TOPIC_PKG;
getting the error "PLS-00103: Encountered the symbol "CREATE" when expec"...
any idea why? or may be is there any other way to write this query

Answer 1

something like
select connect_by_root child_topic ||sys_connect_by_path (topic, '>') path
  from test
where connect_by_isleaf = 1
start with child_topic = 'aa4'
connect by child_topic = prior topicas in
SQL> with test as
  2  (
  3  select 0 sq, 'aa ' topic, 'aa1' child_topic from dual union all
  4  select 1 sq, 'aa1' topic, 'aa2' child_topic from dual union all
  5  select 3 sq, 'aa2' topic, 'aa3' child_topic from dual union all
  6  select 4 sq, 'aa3' topic, 'aa4' child_topic from dual
  7  )
  8  select connect_by_root child_topic ||sys_connect_by_path (topic, '>') path
  9    from test
10   where connect_by_isleaf = 1
11   start with child_topic = 'aa4'
12  connect by child_topic = prior topic
13  /
PATH
aa4>aa3>aa2>aa1>aa