Wm_concat function

Question

Hi
I am using Oracle 11g, and I have a question regarding the following.
I have a table with the following data
Name Category Value
AA 01 012
AA 02 63-123
BB 01 012
BB 02 63-114
BB 03 55
CC 01 088
DD 01 088
DD 02 63-145
DD 03 65
I need to extract the data in the following format
Name 01 02 03
AA 012 63-123
BB 012 63-114 55
CC 088
DD 088 63-145 65
How should I go about doing this?
I tried using the wm_concat function, then using substr to extract each item, but the wm_concat function will extract some rows in the sequence (01,02,03), and other rows in the sequence (01,03,02). What can I do?
Thanks.

Answer 1

Hi,
You can use LISTAGG function.
SQL> WITH t AS (
  2  SELECT 'AA' name, 01 category, '012' value FROM dual UNION ALL
  3  SELECT 'AA' name, 02 category, '63-123' value FROM dual UNION ALL
  4  SELECT 'BB' name, 01 category, '012' value FROM dual UNION ALL
  5  SELECT 'BB' name, 02 category, '63-114' value FROM dual UNION ALL
  6  SELECT 'BB' name, 03 category, '55' value FROM dual UNION ALL
  7  SELECT 'CC' name, 01 category, '088' value FROM dual UNION ALL
  8  SELECT 'DD' name, 01 category, '088' value FROM dual UNION ALL
  9  SELECT 'DD' name, 02 category, '63-145' value FROM dual UNION ALL
10  SELECT 'DD' name, 03 category, '65' value FROM dual)
11  SELECT name, LISTAGG(VALUE, '  ') WITHIN GROUP (ORDER BY value)
12    FROM t
13   GROUP BY name
14  /
NAME LISTAGG(VALUE,'')WITHINGROUP(O
AA   012  63-123
BB   012  55  63-114
CC   088
DD   088  63-145  65
SQL> Solution by Dbb is perfect as per your requirement as you want rows in different columns.
Regards
Ameya
Edited by: Ameya on Apr 20, 2011 1:02 AM