Grouping and Concatenating of Data

Question

SQL> DESC TEST
Name                                      Null?    Type
BAND                                               VARCHAR2(2)
BRANCH_CODE                                        VARCHAR2(4)
COUNTRY                                            VARCHAR2(3)
SERVICE_CATEGORY                                   VARCHAR2(2)
RESIDENTIAL                                        VARCHAR2(1)
COMMERCIAL                                         VARCHAR2(1)
ZIP_CODE                                           VARCHAR2(5)
SQL>SELECT BAND, BRANCH_CODE, COUNTRY, SERVICE_CATEGORY, RESIDENTIAL, COMMERCIAL, ZIP_CODE
FROM TEST
GROUP BY BAND, BRANCH_CODE, COUNTRY, SERVICE_CATEGORY, RESIDENTIAL, COMMERCIAL, ZIP_CODE
ORDER BY BAND, BRANCH_CODE, COUNTRY, SERVICE_CATEGORY, RESIDENTIAL, COMMERCIAL;
BA BRAN COU SE R C ZIP_C
TM 2001 US  PC N Y 32011
TM 2001 US  PC N Y 56321
TM 2001 US  PC Y N 01011
TM 2001 US  PC Y N 01206
TM 2001 US  PC Y N 01302
TM 2003 CAN TC Y N 90981
TQ 2005 BAU PC N Y 98180
TQ 2005 BAU PC N Y 98321
TQ 2005 BAU PC N Y 98734
TQ 2005 BAU PC Y N 93672
10 rows selected.I want to pull the data by concatenating the zip_code based on the unique combination of other fields :
And the result should be like :
BA BRAN COU SE R C ZIP_CODE
TM 2001 US  PC N Y 32011|56321
TM 2001 US  PC Y N 01011|01206|01302
TM 2003 CAN TC Y N 90981
TQ 2005 BAU PC N Y 98180|98321|98734
TQ 2005 BAU PC Y N 93672If anyone can provide some inputs that would be great ...

Answer 1

Frank Kulash wrote:
You don't have to use all of the techniques from http://www.oracle-base.com/articles/misc/StringAggregationTechniques.php
Hi Frank,
The link provides sub-optimal technique using analytic ROW_NUMBER. I mentioned this many times on the forum - there is no need to group by:
SELECT  BAND,
        BRANCH_CODE,
        COUNTRY,
        SERVICE_CATEGORY,
        RESIDENTIAL,
        COMMERCIAL,
        LTRIM(SYS_CONNECT_BY_PATH(ZIP_CODE,'|'),'|') ZIP_CODE
  FROM (
        SELECT  t.*,
                ROW_NUMBER() OVER(PARTITION BY BAND,BRANCH_CODE,COUNTRY,SERVICE_CATEGORY,RESIDENTIAL,COMMERCIAL ORDER BY ZIP_CODE) RN
          FROM  TEST t
  WHERE CONNECT_BY_ISLEAF = 1
  START WITH RN = 1
  CONNECT BY RN = PRIOR RN + 1
  ORDER BY BAND,
           BRANCH_CODE,
           COUNTRY,
           SERVICE_CATEGORY,
           RESIDENTIAL,
           COMMERCIAL
/And same for pre-10g versions:
SELECT  BAND,
        BRANCH_CODE,
        COUNTRY,
        SERVICE_CATEGORY,
        RESIDENTIAL,
        COMMERCIAL,
        LTRIM(SYS_CONNECT_BY_PATH(ZIP_CODE,'|'),'|') ZIP_CODE
  FROM (
        SELECT  t.*,
                ROW_NUMBER() OVER(PARTITION BY BAND,BRANCH_CODE,COUNTRY,SERVICE_CATEGORY,RESIDENTIAL,COMMERCIAL ORDER BY ZIP_CODE) RN,
                COUNT(*) OVER(PARTITION BY BAND,BRANCH_CODE,COUNTRY,SERVICE_CATEGORY,RESIDENTIAL,COMMERCIAL) CNT
          FROM  TEST t
  WHERE RN = 1
  START WITH RN = CNT
  CONNECT BY RN = PRIOR RN + 1
  ORDER BY BAND,
           BRANCH_CODE,
           COUNTRY,
           SERVICE_CATEGORY,
           RESIDENTIAL,
           COMMERCIAL
/SY.