Hierarchy SQL

Question

All,
My input data looks like this:
Parent_Column          Child_Column          Levels_from_Parent
100000               100000                    0
100000               110000                    1
100000               111000                    2
100000               111100                    3
100000               111110                    4
100000               210000                    1
100000               211100                    2
100000               211110                    3Output I want is:
level1          level2          level3          level4          level5          level6
100000     110000     111000     111100     111110     111110
100000     210000     211100     211110     211110     211110In the above example for the parent value 100000 there are 2 child hierarchies one with beginning ‘11’ and another with ‘21’ and they both have different levels. ‘11’ end with 4 levels and ‘21’ ends with 3 levels in it. The output I want is upto 6 levels with filling the levels that are not available with the immediate lower account     .
Thanks in advance!

Answer 1

Hi,
Whenever you have a problem, post CREATE TABLE and INSERT statements for your sample data. Without that, don't expect any solutions you may get to be tested.
You can do something like this:
SELECT    MAX (parent_column)                              AS level1
,       MAX (CASE WHEN levels_from_parent <= 1 THEN child_column END)     AS level2
,       MAX (CASE WHEN levels_from_parent <= 2 THEN child_column END)     AS level3
,       MAX (CASE WHEN levels_from_parent <= 3 THEN child_column END)     AS level4
,       MAX (CASE WHEN levels_from_parent <= 4 THEN child_column END)     AS level5
,       MAX (CASE WHEN levels_from_parent <= 5 THEN child_column END)     AS level6
FROM       table_x
WHERE       levels_from_parent     >= 1
GROUP BY  SUBSTR (child_column, 1, 2)
;I'm guessing that parent_column and child_column are strings.