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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>
SQL> --Using a Column Multiple Times in a GROUP BY Clause
SQL>
SQL> --You can use a column multiple times in a GROUP BY clause, which can enable you to reorganize your data or report on different groupings of data. For example, the following query contains a GROUP BY clause that uses division_id twice, once to group by division_id and the second in a ROLLUP:
SQL>
SQL> SELECT division_id, job_id, SUM(salary)
2 FROM employee
3 GROUP BY division_id, ROLLUP(division_id, job_id);
DIV JOB SUM(SALARY)
--- --- -----------
BUS PRE 800000
SAL MGR 350000
SAL WOR 490000
SUP MGR 200000
BUS 800000
SAL 840000
SUP 200000
BUS 800000
SAL 840000
SUP 200000
10 rows selected.
SQL>
SQL>
SQL>
SQL> drop table employee;
Table dropped.
SQL>
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