Oracle tree queries

SELECT parent_COST_CENTER_ID,COST_CENTER_ID,sum(parent_price) parent_price,lVL
FROM(
        SELECT parent_COST_CENTER_ID,COST_CENTER_ID,
            (TOTAL_ACTUAL_DEBIT) parent_price,lVL
        FROM COST_JOURNALTREES
        WHERE BRANCH_ID = 216
    ) t
GROUP BY parent_COST_CENTER_ID,COST_CENTER_ID,LVL
/

select DISTINCT

   connect_by_root parent_COST_CENTER_ID rootParent,  

   PARENT_SUM,

   COST_CENTER_ID,

   TOTAL_ACTUAL_DEBIT,

   prior TOTAL_ACTUAL_DEBIT prior_TOTAL_ACTUAL_DEBIT,

   level lvl

 FROM

   COST_JOURNALTREES

   WHERE BRANCH_ID = 216 --AND cost_center_id = 407--IN (427,409,407)

   START WITH PARENT_COST_CENTER_ID IS NOT NULL

   connect by prior COST_CENTER_ID = parent_COST_CENTER_ID

/