CODEWITHSUNDEEP
sqloracle-database
kolboc
kolboc

Reputation: 825

Oracle SQL full path hierarchy

I am looking for solution how to select with use of sys_connect_by_path only full hierarchy 'branches'. I found such example on the Internet, but as result is presented it lacks second query which interests me. Example below. Does anyone know how can i achieve second form of output - full hierarchy skipping shorter ones ?

  SQL>
    SQL> column  full_path format a40
    SQL>
    SQL> select  ename
      2  ,       connect_by_root ename            as Designer
      3  ,       sys_connect_by_path(ename,' > ') as full_path
      4  from    emp
      5  start   with job = 'Designer'
      6  connect by prior empno = mgr;

    ENAME    DESIGNER FULL_PATH
    -------- -------- ----------------------------------------
    Jane     Jane      > Jane
    Smart    Jane      > Jane > Smart
    Ana      Jane      > Jane > Smart > Ana
    Fake     Jane      > Jane > Fake
    Tom      Jane      > Jane > Fake > Tom
    Black    Black     > Black
    Jack     Black     > Black > Jack
    Wil      Black     > Black > Wil
    Mary     Black     > Black > Mary
    Take     Black     > Black > Take
    Jane     Black     > Black > Jane
    Chris    Chris     > Chris
    Mike     Chris     > Chris > Mike
    Peter    Peter     > Peter
    Jane     Peter     > Peter > Jane
    Smart    Peter     > Peter > Jane > Smart
    Ana      Peter     > Peter > Jane > Smart > Ana
    Fake     Peter     > Peter > Jane > Fake
    Tom      Peter     > Peter > Jane > Fake > Tom

    ENAME    DESIGNER FULL_PATH
    -------- -------- ----------------------------------------
    Black    Peter     > Peter > Black
    Jack     Peter     > Peter > Black > Jack
    Wil      Peter     > Peter > Black > Wil
    Mary     Peter     > Peter > Black > Mary
    Take     Peter     > Peter > Black > Take
    Jane     Peter     > Peter > Black > Jane
    Chris    Peter     > Peter > Chris
    Mike     Peter     > Peter > Chris > Mike

Upvotes: 2

Views: 7314

Answers (1)

MT0
MT0

Reputation: 168051

Use the CONNECT_BY_ISLEAF pseudocolumn to filter to only those rows that are at the leaf of the hierarchy tree:

select  ename
,       connect_by_root ename            as Designer
,       sys_connect_by_path(ename,' > ') as full_path
from    emp
WHERE   CONNECT_BY_ISLEAF = 1
start   with job = 'Designer'
connect by prior empno = mgr;

Upvotes: 3

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