Selecting /distributing column values

Question

PQR A B C D E
AA 1 2 3 4
BB 1
CC 1 2 3
DD 1 2 3 4 5
EE 1 2
six columns PQR, A B C D E
Here in this table AA is a combination of 1 2 3 4 , similarly BB is 1 , CC is a combination 1 2 3 , DD is a combination of 1 2 3 4 5 , EE is a combination of 1 2
My new table will have a two columns PQR and ZZ with these values .
My final table will look like this , with all the combination values under a single column ZZ .
PQR ZZ
AA 1,2,3,4
BB 1
CC 1,2,3
DD 1,2,3,4,5
EE 1,2
How should the query be if I have to list each of these combination values under a single column and get rid of columns B C D E .
The resulting table should be in this order with 2 columns PQR and A
PQR A
AA 1
AA 2
AA 3
AA 4
BB 1
CC 1
CC 2
CC 3
DD 1
DD 2
DD 3
DD 4
DD 5
EE 1
EE 2
Any takers please.

Answer 1

Hi,
Type {code} (all small letters, between curly brackets) before and after tabular data when posting on this site, to preserve spacing.
I think what you want is:
SELECT     SUBSTR     (      CASE WHEN a IS NOT NULL THEN ',' || a END
              ||     CASE WHEN b IS NOT NULL THEN ',' || b END
              ||     CASE WHEN c IS NOT NULL THEN ',' || c END
              ||     CASE WHEN d IS NOT NULL THEN ',' || d END
              ||     CASE WHEN e IS NOT NULL THEN ',' || e END
          , 2
FROM     table_x;The CASE staements add only the items that are in the table, each preceeded by a comma. That keeps you from getting multiple commas when multiple columns are NULL.
SUBSTR removes the comma before the first item.
Edited by: Frank Kulash on Feb 4, 2009 5:13 PM