How to avoid duplication

I am facing a problem, put out the query must be such that it should return an a.claim_no (he is core_business.cb_pensioner a PK), where as it is returned from the claim_no in duplicate.
This is data of old age pensioners, it takes account of every retiree with respective information.
I'll be v thank full for your advice.

SELECT a.claim_no,  a.NAME,  a.old_nic_no,  a.new_nic_no,
             LPAD (ip_region_fo_code, 4, 0) || ip_check_digit || LPAD (ip_serial_no, 6, 0)   AS eobi_no,
          rate_change_date,    pension_amount,   a.bank_code ,c.name bank_name ,  a.branch_code, B.ADDRESS,  b.name branch_name, d.name branch_city,date_of_birth,  a. region_fo_code
     FROM core_business.cb_pensioner a, 
     general_information.cb_branch b,
     general_information.cb_bank c,
     general_information.cb_city d
    WHERE    a. status = 'A' 
          AND SUBSTR (claim_no, 3, 1) <> 'S'
          AND (old_nic_no IS NOT NULL OR new_nic_no IS NOT NULL)
          AND SUBSTR (old_nic_no, 1, 3) <> '000'
          AND SUBSTR (old_nic_no, 8, 6) <> '000000'
          AND SUBSTR (old_nic_no, 8, 6) <> '101010'
         /* AND a.bank_code = 3
          AND EXISTS
                 (SELECT NULL
                    FROM general_information.cb_branch b
                   WHERE a.bank_code = b.bank_code
                         AND a.branch_code = b.branch_code)*/ 
                         and a.bank_code = c.bank_code 
                         and a.branch_code = b.branch_code
                         and b.city_code = d.city_code;

Hello

then the general table of duplicates. What I sometimes do, is to include the ROWID from all of the tables (a.rowid, b.rowid, c.rowid, d.rowid). If you find records where the main table has the same ROWID, but one of the other tables so you know what are the tables gives you the duplicate lines. With the row ID (or PK), you can find out why you have duplicates. Maybe in the paintings of general_information data have a time factor, so there may be duplicate codes.

Herald tiomela
http://htendam.WordPress.com

Tags: Database

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