SELECT TABLE BASED ON CONDITION

Question

hi every one , i need your help in resolving this issue . if you look at the last column service_id in the select the value of the service_id is derived from by the source_system.
each source system can have 1 to multiple service_ids . the below query returns same data set with different service_ids. my question is
for example when source_system is 'COMS' the i have included table ref_coms_circuit to get multiple service ids. so if i have to include another source_system 'ESP' then how will i do that.
WITH t AS
     (SELECT   so.tin, so.o_seq, so.order_type,
               so.customer_req_due_date customer_due_date,
               MAX (soplm1.milestone_date) order_date,
               MAX (soplm2.milestone_date) hold_begin_date,
               MAX (soplm3.milestone_date) hold_end_date
          FROM s_order so,
               s_order_product_leg_milestone soplm,
               s_order_product_leg_milestone soplm1,
               s_order_product_leg_milestone soplm2,
               s_order_product_leg_milestone soplm3
         WHERE                                    -- so.order_status = 'A' AND
               so.contract_id IN ('157798', '157800')
           --  AND soplm.milestone_id = 4350
           AND soplm.source_system_name = 'OPRO'
           AND soplm.o_seq = so.o_seq
           AND soplm.last_modified_date >=
                  TO_DATE ('07/01/2007 00 :00:00', ' MM/DD/YYYY HH24: MI: SS')
           AND soplm.last_modified_date < SYSDATE
           AND soplm.tin = 'OPRO.670148'
           AND soplm1.tin(+) = so.tin
           AND soplm1.o_seq(+) = so.o_seq
           AND so.tin = soplm2.tin(+)
           AND so.tin = soplm3.tin(+)
           AND so.o_seq = soplm2.o_seq(+)
           AND so.o_seq = soplm3.o_seq(+)
           AND soplm1.milestone_id(+) = 100
           AND soplm1.source_system_name(+) = 'OPRO'
           AND soplm2.milestone_id(+) = 1650
           AND soplm2.source_system_name(+) = 'NPRO'
           AND soplm3.milestone_id(+) = 1690
           AND soplm3.source_system_name(+) = 'NPRO'
      GROUP BY so.tin, so.o_seq, so.order_type, so.customer_req_due_date)
SELECT DISTINCT soplm4.tin, soplm4.VERSION, soplm4.product_serial_number,
                soplm4.node_id, t.order_type, sopl.product_id,
                rp.product_id_desc product_desc, NULL AS product_catalog_id,
                soplm4.source_system_name, t.order_date, t.customer_due_date,
                NULL AS asrn, NULL AS service_typ_seq, t.hold_begin_date,
                t.hold_end_date,
                DECODE (soplm4.source_system_name,
                        'COMS', 'COMS CIRCUIT ID',
                        'FE', 'FE CIRCUIT ID',
                        'VDDS', 'PVC ID',
                        'ESP', 'ESP Product Billing Key',
                        'OTS', 'OTS SITE ID',
                        'UCLP', 'K - Number',
                        'NCAP', 'NETCAP 800# ',
                        'IASA', 'IASA ANI ',
                        'COMP', 'COMMONPLACE AUTH CODE',
                        soplm4.source_system_name
                       ) neid_type,
                CASE soplm4.source_system_name
                   WHEN 'COMS'
                      THEN rcc.circuit_number
                   WHEN 'VDDS'
                      THEN sopl.pvc_id
                   WHEN 'OTS'
                      THEN sopl.site
                   WHEN 'IASA'
                      THEN sopl.iasa_account_id
                   WHEN 'COMP'
                      THEN sopl.pin
                   WHEN 'UCLP'
                      THEN sopl.billing_identifier
                   WHEN 'NCAP'
                      THEN sopl.toll_free_num
--          WHEN 'ESP' THEN soed.product_billing_key
--             WHEN 'FE' THEN
                ELSE NULL
                END service_id
           FROM t,
                s_order_product sop,
                s_order_product_leg sopl,
                s_order_product_leg_milestone soplm4,
                ref_product rp,
                ref_coms_circuit rcc
          WHERE soplm4.tin = t.tin
            AND soplm4.o_seq = t.o_seq
            AND soplm4.source_system_name IN (SELECT source_system_name
                                                FROM com_calnet_systems)
            AND sop.tin = t.tin
            AND sop.o_seq = t.o_seq
            AND sopl.tin = t.tin
            AND sop.op_seq = soplm4.op_seq
            AND sopl.o_seq = t.o_seq
            AND sopl.opl_seq = soplm4.opl_seq
            AND rp.product_id = sopl.product_id
            AND rcc.coms_service_number = sop.coms_service_number;

Answer 1

Either union all of them before or after the join, i.e.,
Solution 1:
SELECT DISTINCT soplm4.tin, soplm4.VERSION, soplm4.product_serial_number,
           FROM t,
                ref_coms_circuit rcc
          WHERE soplm4.tin = t.tin
            AND rcc.coms_service_number = sop.coms_service_number
union all
SELECT DISTINCT soplm4.tin, soplm4.VERSION, soplm4.product_serial_number,
           FROM t,
                ref_vdds_circuit rvc
          WHERE soplm4.tin = t.tin
            AND rvc.coms_service_number = sop.coms_service_number
union all
SELECT DISTINCT soplm4.tin, soplm4.VERSION, soplm4.product_serial_number,
...Solution 2:
SELECT DISTINCT soplm4.tin, soplm4.VERSION, soplm4.product_serial_number,
           FROM t,
           (select 'COMS' source, circuit_number data, coms_service_number
            -- any column you need in your output
            from ref_coms_circuit
            union all
            select 'VDDS', pvc_id, coms_service_number
            -- any column you need in your output
            from ref_vdds_circuit
            union all...) bigunion
          WHERE soplm4.tin = t.tin
            AND soplm4.source_system_name = bigunion.source
            AND rcc.coms_service_number = sop.coms_service_number;Edited by: thtsang on Oct 20, 2009 10:28 PM
Edited by: thtsang on Oct 20, 2009 10:44 PM