Link Person Based on address or company name

Question

Version : Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
I have the Following Scenario where i am trying to link Person based on Addr_id / Addr_id_comp/ Org_id.
I want to create a flag as 1 which tells me that they are linked. Right now with the below Example The flag Returns as 0.
WITH Link_address_t AS (SELECT   6439 Person_id,
                                77131101 we_Addr_id,
                                183818078 we_addr_id_comp,
                                9287841 we_org_id
                         FROM   DUAL
                       UNION ALL
                       SELECT   6439 Person_id,
                                393426140 we_Addr_id,
                                394052621 we_addr_id_comp,
                                918388 we_org_id
                         FROM   DUAL
                       UNION ALL
                       SELECT   6439 Person_id,
                                77131101 we_Addr_id,
                                394052621 we_addr_id_comp,
                                918388 we_org_id
                         FROM   DUAL)
    SELECT   Person_id,
             we_addr_id,
             we_addr_id_comp,
             we_org_id,
             CASE
                WHEN (   we_addr_id = PRIOR we_addr_id
                      OR we_addr_id_comp = PRIOR we_addr_id_comp
                      OR we_org_id = PRIOR we_org_id)
                THEN
                   1
                ELSE
                   0
             END
                FLag
      FROM   Link_address_t
START WITH   Person_id = 6439
CONNECT BY   NOCYCLE Person_id = PRIOR Person_id
Output Required
PERSON_ID    WE_ADDR_ID    WE_ADDR_ID_COMP    WE_ORG_ID    FLAG
6439    77131101    183818078    9287841    1
6439    393426140    394052621    918388    1
6439    77131101    394052621    918388      1

Answer 1

I don't see why you're using a hierarchical query here. This seems to do what you want (note, I've added a primary key column to your original table):
WITH Link_address_t AS (SELECT  1 pk,
                                6439 Person_id,
                                77131101 we_Addr_id,
                                183818078 we_addr_id_comp,
                                9287841 we_org_id
                         FROM   DUAL
                       UNION ALL
                       SELECT   2 pk,
                                6439 Person_id,
                                393426140 we_Addr_id,
                                394052621 we_addr_id_comp,
                                918388 we_org_id
                         FROM   DUAL
                       UNION ALL
                       SELECT   3 pk,
                                6439 Person_id,
                                77131101 we_Addr_id,
                                394052621 we_addr_id_comp,
                                918388 we_org_id
                         FROM   DUAL)
    SELECT   Person_id,
             we_addr_id,
             we_addr_id_comp,
             we_org_id,
             CASE
                WHEN EXISTS (SELECT 99
                             FROM   link_address_t la2
                             WHERE  la2.person_id = la.person_id
                             AND    la2.pk != la.pk
                             AND   (la2.we_Addr_id = la.we_addr_id
                                 OR la2.we_Addr_id_comp = la.we_addr_id_comp
                                 OR la2.we_org_id = la.we_org_id)) THEN 1
                ELSE 0
             END Flag
      FROM   Link_address_t la
     WHERE   Person_id = 6439