Connect by prior problem

Question

hi friends i have table like tree which have have two different type of leaf
my tables
deparment did,name
person perid,name
treetable id, pid,did,perid--tree table one row have only did or pid if did =2 , peridhave to be nullso i generate hierarchial structure between person and deparments
   id      pid       did     perid
    1     null       1        null
    2    1          null        1     
    3     2         null        2
    4     2          null       3   
    5     3          2          null
   6     5          null       4  
    7     5          null       5for example i select first deparment's person querry result must be (id=)2,3,4 not 6,7 because 6,7 below 5
can we write with connect by prior it?

Answer 1

Hi,
JAVAMAN2 wrote:
hi friends i have table like tree which have have two different type of leaf
my tables
deparment did,name
person perid,name
treetable id, pid,did,perid--tree table one row have only did or pid if did =2 , peridhave to be nullso i generate hierarchial structure between person and deparments
id      pid       did     perid
1     null       1        null
2    1          null        1     
3     2         null        2
4     2          null       3   
5     3          2          null
6     5          null       4  
7     5          null       5for example i select first deparment's person querry result must be (id=)2,3,4 not 6,7 because 6,7 below 5I'm not sure why you want to exclude 5, 6 and 7. Is it that you don't want any nodes (except the root) with NULL perid?
can we write with connect by prior it?Yes.
If my guess about excluding 5 and it's descendants is correct:
SELECT     *     -- or whatever you want
FROM     treetable
START WITH     pid     IS NULL
CONNECT BY     pid     = PRIOR id
     AND     depid     IS NULL
;If you need the names from the other tables, then outer-join both other tables, and use NVL to get the one name that is not NULL.