Answer / mohan

select count(*),column_name from table_name group by
column_name having count(*)>1

Answer / sarath

I don't know the exact intention of the above answers, but I am making mine clear that to find the TOTAL DUPLICATED RECORDS and THEIR COUNT OF REPETITIONS, the Pseudo code is:

Select col1,col2,col3,....,COLn count(*) from <TN>
group by col1,col2,col3,....,COLn having count(*) > 1;

Wish everybody complies with it, its tested.

Answer / a.balakrishna

select * from education where rowid in (select min(rowid)
from ex group by sno having count(*)>1);


100% it is true

Best of luck

9177509010

Answer / bhuvi

use self join and find the intersection

Answer / dev

SELECT * FROM TAB1 A WHERE A.ROWID > ANY
(SELECT B.ROWID FROM TAB2 WHERE A.COL1=B.COL1)

Answer / naresh

select * from emp where sal in(select sal from emp group by
sal having count(sal)>1);

Answer / "d"

select count(*),ss from dd group by
ss having count(*)>1

Answer / selvaraj v

In Oracle 10g :
-----------------

SQL> SELECT * FROM emp;

EMPNO ENAME JOB MGR HIREDATE
SAL COMM DEPTNO
---------- ---------- --------- ---------- ---------
---------- ---------- ----------
7369 SMITH CLERK 7902 17-DEC-80
7500 20
7499 ALLEN SALESMAN 7698 17-DEC-80
1600 300 30
7521 WARD SALESMAN 7698 22-FEB-81
1250 500 30
7566 JONES MANAGER 7839 02-APR-81
2975 20
7654 MARTIN SALESMAN 7698 28-SEP-81
1250 1400 30
7698 BLAKE MANAGER 7839 01-MAY-81
2850 30
7782 CLARK MANAGER 7839 09-JUN-81
2450 10
7788 SCOTT ANALYST 7566 19-APR-87
3000 20
7839 KING PRESIDENT 17-NOV-81
5000 10
7844 TURNER SALESMAN 7698 08-SEP-81
1500 0 30
7876 ADAMS CLERK 7788 23-MAY-87
1100 20

7900 JAMES CLERK 7698 03-DEC-81
950 30
7902 FORD ANALYST 7566 03-DEC-81
3000 20
7934 MILLER CLERK 7782 23-JAN-82
1300 10
1 SELVA S/W ENG 7521 18-DEC-09
15000 1000 10
7521 WARD SALESMAN 7698 22-FEB-81
1250 500 30

16 rows selected.

The emp table contains DUPLICATE empno in this table. that's
2 empno's same. We find that empno's, Using the below query :

SQL> SELECT * FROM EMP
2 WHERE ROWID IN(SELECT MAX(ROWID) FROM EMP
3 GROUP BY EMPNO,ENAME,MGR,SAL,DEPTNO
4 HAVING COUNT(*)>1);

EMPNO ENAME JOB MGR HIREDATE
SAL COMM DEPTNO
---------- ---------- --------- ---------- ---------
---------- ---------- ----------
7521 WARD SALESMAN 7698 22-FEB-81
1250 500 30

In this emp table contains empno 7251 is 2 times.

Anyone Check this query. I'm expecting user comments...

Answer / jay k patel

SQL> select * from emp;

ENO ENAME DOJ DESGN ADDRESS BSAL
---------- ------- --------- ------- ------- ----------
1 jay 04-JAN-80 md vapi 50000
2 vijay 04-FEB-75 manager vapi 7000
1 ajay 12-JAN-77 dba vapi 9000
3 rajay 05-MAR-70 cleark vapi 5000
4 sujay 28-JAN-73 dba vapi 6000
5 jayesh 07-APR-74 cleark vapi 8000
7 jaymin 04-JAN-62 analyst vapi 4000
6 jaynis 10-MAY-69 dba vapi 9000
1 jayur 04-JAN-74 manager vapi 4000
12 jaynil 14-DEC-71 cleark vapi 2000

10 rows selected.

SQL> SELECT desgn , count(*)
2 FROM emp
3 GROUP BY Desgn
4 Having count(*) > 1 ;

DESGN COUNT(*)
------- ----------
cleark 3
dba 3
manager 2

SQL>

Answer / kumargvk

select * from education a where rownum>(select max(rownum)
from education b where b.rno=b.rno)

a. Can you delete data from a View. b. If Yes, can you delete it if there are multiple tables c. If No, can you delete if there is single source table which is joining.

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