Answer Posted / 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...

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