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You can use the GROUP_ID() function to remove duplicate rows returned by a GROUP BY clause

SQL> CREATE TABLE employee(   2    employee_id INTEGER,   3    division_id CHAR(3),   4    job_id CHAR(3),   5    first_name VARCHAR2(10) NOT NULL,   6    last_name VARCHAR2(10) NOT NULL,   7    salary NUMBER(6, 0)   8  ); Table created. SQL> SQL> insert into employee (EMPLOYEE_ID,division_id,JOB_ID,FIRST_NAME,LAST_NAME,SALARY)   2                 values(1, 'BUS','PRE','James','Smith','800000'); 1 row created. SQL> insert into employee (EMPLOYEE_ID,division_id,JOB_ID,FIRST_NAME,LAST_NAME,SALARY)   2                 values(2, 'SAL','MGR','Ron','Johnson','350000'); 1 row created. SQL> insert into employee (EMPLOYEE_ID,division_id,JOB_ID,FIRST_NAME,LAST_NAME,SALARY)   2                 values(3, 'SAL','WOR','Fred','Hobbs','140000'); 1 row created. SQL> insert into employee (EMPLOYEE_ID,division_id,JOB_ID,FIRST_NAME,LAST_NAME,SALARY)   2                 values(4, 'SUP','MGR','Susan','Jones','200000'); 1 row created. SQL> insert into employee (EMPLOYEE_ID,division_id,JOB_ID,FIRST_NAME,LAST_NAME,SALARY)   2                 values(5, 'SAL','WOR','Rob','Green','350000'); 1 row created. SQL> SQL> select * from employee; EMPLOYEE_ID DIV JOB FIRST_NAME LAST_NAME      SALARY ----------- --- --- ---------- ---------- ----------           1 BUS PRE James      Smith          800000           2 SAL MGR Ron        Johnson        350000           3 SAL WOR Fred       Hobbs          140000           4 SUP MGR Susan      Jones          200000           5 SAL WOR Rob        Green          350000 SQL> SQL> --Using the GROUP_ID() Function SQL> SQL> --You can use the GROUP_ID() function to remove duplicate rows returned by a GROUP BY clause.  GROUP_ID() doesn’t accept any parameters.  If n duplicates exist for a particular grouping, GROUP_ID returns numbers in the range 0 to n-1. SQL> SQL> SQL> SELECT division_id, job_id, GROUP_ID(), SUM(salary)   2  FROM employee   3  GROUP BY division_id, ROLLUP(division_id, job_id); DIV JOB GROUP_ID() SUM(SALARY) --- --- ---------- ----------- BUS PRE          0      800000 SAL MGR          0      350000 SAL WOR          0      490000 SUP MGR          0      200000 BUS              0      800000 SAL              0      840000 SUP              0      200000 BUS              1      800000 SAL              1      840000 SUP              1      200000 10 rows selected. SQL> SQL> SQL> SQL> drop table employee; Table dropped. SQL>