How can i select the duplicate values

Question

Hi experts ,
how can i find the duplicate values from the table. i want to display the all duplicate the rows.
1. Table Structure :-
CREATE TABLE CIF_MIGRATE
  LINE_NO        NUMBER(10),
  ACCT_NO        VARCHAR2(20 BYTE),
  BRANCH_ID      VARCHAR2(1 BYTE),
  CUSTOMER_NAME  VARCHAR2(100 BYTE),
  FATHER_NAME    VARCHAR2(100 BYTE),
  GF_NAME        VARCHAR2(100 BYTE),
  TOTAL          VARCHAR2(100 BYTE),
  STATUS         VARCHAR2(100 BYTE),
  CUSTOMER_TYPE  VARCHAR2(10 BYTE),
  GENDER         VARCHAR2(10 BYTE)
) 2. Sample Data:-
SET DEFINE OFF;
Insert into CIF_MIGRATE
   (LINE_NO, BRANCH_ID, CUSTOMER_NAME, CUSTOMER_TYPE)
Values
   (72, '1', 'Addis Belay Construction Material Rental', 'C');
Insert into CIF_MIGRATE
   (LINE_NO, BRANCH_ID, CUSTOMER_NAME, CUSTOMER_TYPE)
Values
   (73, '1', 'Addis Belay Construction Material Rental', 'C');
SET DEFINE OFF;
Insert into CIF_MIGRATE
   (LINE_NO, BRANCH_ID, CUSTOMER_NAME, FATHER_NAME, CUSTOMER_TYPE, GENDER)
Values
   (2869, '1', 'Abraham', 'Fiseha',
    'I', 'Male');
Insert into CIF_MIGRATE
   (LINE_NO, BRANCH_ID, CUSTOMER_NAME, FATHER_NAME, CUSTOMER_TYPE, GENDER)
Values
   (2870, '9', 'Abraham', 'Fiseha',
    'I', 'Male');
Insert into CIF_MIGRATE
   (LINE_NO, BRANCH_ID, CUSTOMER_NAME, FATHER_NAME, GF_NAME, CUSTOMER_TYPE, GENDER)
Values
   (2872, '9', 'Abraham', 'Baraki',
    'Medehniye', 'I', 'Female');
Insert into CIF_MIGRATE
   (LINE_NO, BRANCH_ID, CUSTOMER_NAME, FATHER_NAME, GF_NAME, CUSTOMER_TYPE, GENDER)
Values
   (2873, '1', 'Abraham', 'Geber kirstos',
    'gebre medihin', 'I', 'Female');
Insert into CIF_MIGRATE
   (LINE_NO, BRANCH_ID, CUSTOMER_NAME, FATHER_NAME, GF_NAME, CUSTOMER_TYPE)
Values
   (2874, '1', 'Abraham', 'Gebre egziabher',
    'Negussie', 'I');
COMMIT;4. My requirement is i need display all the duplication customer
CUSTOMER_NAME                                 FATHER_NAME,GF_NAME
Addis Belay Construction Material Rental   
Addis Belay Construction Material Rental
Abraham                                              Fiseha
Abraham                                              Fiseha5. I tried below query but i cant reach what i want exactly
SELECT CUSTOMER_NAME,FATHER_NAME,GF_NAME
                           FROM CIF_MIGRATE
                      GROUP BY CUSTOMER_NAME,FATHER_NAME,GF_NAME
                         HAVING COUNT (*) > 1kindly suggest me the solution
Thanks
Arun

Answer 1

Hi,
You're on the right track using COUNT (*), but, for this job, you want the analytic COUNT, not the aggregate COUNT.
"GROUP BY x, y, z" means that the result set will only contain 1 row for each distinct combination of x, y and z. Most aggregate functions (including COUNT) have analytic counterparts that get the same results without reducing the number of rows.
Here's one way you can use the analytic COUNT function:
WITH     got_cnt          AS
     SELECT    customer_name
     ,       father_name
     ,       gf_name
     ,       COUNT (*) OVER ( PARTITION BY  customer_name
                           ,                 father_name
                     ,           gf_name
                     )     AS cnt
     FROM       cif_migrate
SELECT    customer_name
,       father_name
,       gf_name
FROM       got_cnt
WHERE       cnt     > 1
;PARTITION BY in analytic functions corresponds to GROUP BY in aggregate functions.