Rows to comma delimited string

Question

Oracle version Release 10.2.0.4.0
i have the issue with the QuerySQL
SQL returning comma delimited rate_codes for each (outlet, id_service)
QuerySQL:
        select
            (select ltrim(MAX(SYS_CONNECT_BY_PATH(v.service,',')) KEEP (DENSE_RANK LAST ORDER BY curr),',') ratecodes
              from (
                     select os.outlet, rsm.id_service, os.service,
                            row_number() OVER (PARTITION BY os.outlet, rsm.id_service ORDER BY os.service) AS curr,
                            row_number() OVER (PARTITION BY os.outlet, rsm.id_service ORDER BY os.service) -1 AS prev
                       from prcsd_outletsvcs_test os,
                            ratecode_service_mapping_test rsm
                       where os.corp                = to_number(substr(:account_number,1,5))
                       and os.house                 = ltrim(substr(:account_number,6,6),'0')
                       and os.cust                  = ltrim(substr(:account_number,12,2),'0')
                       and os.outlet                = :no_outlet
                       and rsm.corp                 = os.corp
                       and rsm.rate_code            = os.service
                       and rsm.id_service           = :id_service
                    ) v
             group by outlet, id_service
            CONNECT BY prev = PRIOR curr
            START WITH curr = 1
            ) ratecodes
        from dual;parameter account_number 0787074919903, no_outlet=2, id_service=3 returns V1,XF
parameter account_number 0787074919903, no_outlet=2, id_service=1 returns X1
This sql works fine, but if i enclose it with another select ... dual and the QuerySQL in cursor like
( the parameters account_number, no_outlet and id_service is returned from some other tables in outer loop, here i am using outer dual to simulate my situation )
select
    :no_outlet, :id_service,
    cursor (
                QuerySQL above
            ) ratecodes
        from dual
    ) ratecodes
from dual;cursor output:
parameter account_number 0787074919903, no_outlet=2, id_service=3 returns V1,XF
parameter account_number 0787074919903, no_outlet=2, id_service=1 returns nothing
the (outlet,id_service) with only one rate_code is not returning anything
data creation:
CREATE TABLE PRCSD_OUTLETSVCS_TEST
  CORP     NUMBER                               NOT NULL,
  HOUSE    VARCHAR2(6 BYTE)                     NOT NULL,
  CUST     VARCHAR2(2 BYTE)                     NOT NULL,
  OUTLET   NUMBER                               NOT NULL,
  SERVICE  VARCHAR2(2 BYTE)                     NOT NULL
CREATE TABLE RATECODE_SERVICE_MAPPING_TEST
  CORP        NUMBER(5),
  ID_SERVICE  NUMBER(10),
  RATE_CODE   VARCHAR2(10 BYTE)
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 1, 'X1');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 1, 'X2');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 1, 'XC');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 2, 'V1');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 2, 'X1');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 2, 'X2');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 2, 'XF');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 3, '94');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 3, 'X1');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 3, 'X2');
Insert into PRCSD_OUTLETSVCS_TEST(corp, house, cust, outlet, service)
Values(7870, '749199', '3', 3, 'XR');
Insert into RATECODE_SERVICE_MAPPING_TEST(corp, id_service, rate_code)
Values(7870, 1, 'X1');
Insert into RATECODE_SERVICE_MAPPING_TEST(corp, id_service, rate_code)
Values(7870, 2, 'XC');
Insert into RATECODE_SERVICE_MAPPING_TEST(corp, id_service, rate_code)
Values(7870, 3, 'V1');
Insert into RATECODE_SERVICE_MAPPING_TEST(corp, id_service, rate_code)
Values(7870, 3, 'XF');
Insert into RATECODE_SERVICE_MAPPING_TEST(corp, id_service, rate_code)
Values(7870, 4, '94');
Insert into RATECODE_SERVICE_MAPPING_TEST(corp, id_service, rate_code)
Values(7870, 4, 'X1');
Insert into RATECODE_SERVICE_MAPPING_TEST(corp, id_service, rate_code)
Values(7870, 4, 'XR');thanks for any help

Answer 1

pkchan wrote:
i added
where
v.outlet        = svc_rc.outlet
and v.id_service    = svc_rc.id_serviceand comment out the assignment lines with :no_outlet and :id_service
You misunderstand how hierarchical query works. Look at:
                     select  max(ltrim(SYS_CONNECT_BY_PATH(v.service,','),',')) ratecodes
                        from (
                              select  os.outlet,
                                      rsm.id_service,
                                      os.service,
                                      row_number() OVER (PARTITION BY os.outlet, rsm.id_service ORDER BY os.service) AS rn
                                from  prcsd_outletsvcs_test os,
                                      ratecode_service_mapping_test rsm
                                where os.corp        = to_number(substr(:account_number,1,5))
                                  and os.house       = ltrim(substr(:account_number,6,6),'0')
                                  and os.cust        = ltrim(substr(:account_number,12,2),'0')
                                  --and os.outlet      = :no_outlet
                                  and rsm.corp       = os.corp
                                  and rsm.rate_code  = os.service
                                  --and rsm.id_service = :id_service
                             ) v
                        where
                            v.outlet        = svc_rc.outlet
                        and v.id_service    = svc_rc.id_service
                            CONNECT BY rn = PRIOR rn + 1
                            START WITH rn = 1WHERE clause in hierarchical query is applied AFTER hierarchy is build. Therefore rn=1 from EACH combination is joined to rn=2 in ALL combinations and then joined to rn=3 in ALL combinations, etc. and only then WHERE clause is applied. To create proper hierarchies you need:
                        where
                            v.outlet        = svc_rc.outlet
                        and v.id_service    = svc_rc.id_service
                           CONNECT BY outlet = PRIOR outlet
                                  AND id_service = PRIOR id_service
                                 AND rn = PRIOR rn + 1
                            START WITH rn = 1Now:
with svc_rc as
    select distinct os.outlet, rsm.id_service
      from prcsd_outletsvcs_test os,
           ratecode_service_mapping_test rsm
     where rsm.corp       = os.corp
       and rsm.rate_code  = os.service
     order by outlet, id_service
select
    svc_rc.outlet, svc_rc.id_service,
    cursor (
            select  (
                     select  max(ltrim(SYS_CONNECT_BY_PATH(v.service,','),',')) ratecodes
                        from (
                              select  os.outlet,
                                      rsm.id_service,
                                      os.service,
                                      row_number() OVER (PARTITION BY os.outlet, rsm.id_service ORDER BY os.service) AS rn
                                from  prcsd_outletsvcs_test os,
                                      ratecode_service_mapping_test rsm
                                where os.corp        = to_number(substr(:account_number,1,5))
                                  and os.house       = ltrim(substr(:account_number,6,6),'0')
                                  and os.cust        = ltrim(substr(:account_number,12,2),'0')
                                  --and os.outlet      = :no_outlet
                                  and rsm.corp       = os.corp
                                  and rsm.rate_code  = os.service
                                  --and rsm.id_service = :id_service
                             ) v
                        where
                            v.outlet        = svc_rc.outlet
                        and v.id_service    = svc_rc.id_service
                           CONNECT BY outlet = PRIOR outlet
                                  AND id_service = PRIOR id_service
                                 AND rn = PRIOR rn + 1
                            START WITH rn = 1
                    ) ratecodes
              from  dual
           ) ratecodes
  from  svc_rc
    OUTLET ID_SERVICE RATECODES
         1          1 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
         1          2 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
         1          4 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
         2          1 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
         2          3 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
V1,XF
         2          4 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
         3          1 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
         3          4 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
94,X1,XR
8 rows selected.
SQL> You get 94,X1,XR, but still wrong results for other rows. So get rid of that extra level of select (we already established it is the source of the bug you are experiencing):
with svc_rc as
    select distinct os.outlet, rsm.id_service
      from prcsd_outletsvcs_test os,
           ratecode_service_mapping_test rsm
     where rsm.corp       = os.corp
       and rsm.rate_code  = os.service
     order by outlet, id_service
select
    svc_rc.outlet,
    svc_rc.id_service,
    cursor (
            select  ltrim(SYS_CONNECT_BY_PATH(v.service,','),',') ratecodes
              from (
                    select  os.outlet,
                            rsm.id_service,
                            os.service,
                            row_number() OVER (PARTITION BY os.outlet, rsm.id_service ORDER BY os.service) AS rn
                      from  prcsd_outletsvcs_test os,
                            ratecode_service_mapping_test rsm
                      where os.corp        = to_number(substr(:account_number,1,5))
                        and os.house       = ltrim(substr(:account_number,6,6),'0')
                        and os.cust        = ltrim(substr(:account_number,12,2),'0')
                        and rsm.corp       = os.corp
                        and rsm.rate_code  = os.service
                   ) v
              WHERE connect_by_isleaf = 1
                AND outlet = svc_rc.outlet
                AND id_service = svc_rc.id_service
              START WITH rn = 1
              CONNECT BY outlet = PRIOR outlet
                     AND id_service = PRIOR id_service
                     AND rn = PRIOR rn + 1
           ) ratecodes
  from  svc_rc
    OUTLET ID_SERVICE RATECODES
         1          1 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
X1
         1          2 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
XC
         1          4 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
X1
         2          1 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
X1
         2          3 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
V1,XF
         2          4 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
X1
         3          1 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
X1
         3          4 CURSOR STATEMENT : 3
CURSOR STATEMENT : 3
RATECODES
94,X1,XR
8 rows selected.
SQL> SY.