GROUPING SETS and DENSE_RANK

The following query uses GROUPING SETS and DENSE_RANK() to get just the salary amount subtotal rankings:


CREATE TABLE EMP (EMPNO NUMBER(4) NOT NULL,
                  ENAME VARCHAR2(10),
                  JOB VARCHAR2(9),
                  SAL NUMBER(7, 2),
                  DEPTNO NUMBER(2));

INSERT INTO EMP VALUES (1, 'SMITH', 'CLERK',     800,    20);
INSERT INTO EMP VALUES (2, 'ALLEN', 'SALESMAN', 1600,    30);
INSERT INTO EMP VALUES (3, 'WARD',  'SALESMAN', 1250,    30);
INSERT INTO EMP VALUES (4, 'JONES', 'MANAGER',  2975,    20);
INSERT INTO EMP VALUES (5, 'MARTIN','SALESMAN', 1250,    30);
INSERT INTO EMP VALUES (6, 'BLAKE', 'MANAGER',  2850,    30);
INSERT INTO EMP VALUES (7, 'CLARK', 'MANAGER',  2850,    10);
INSERT INTO EMP VALUES (8, 'SCOTT', 'ANALYST',  3000,    20);
INSERT INTO EMP VALUES (9, 'KING',  'PRESIDENT',3000,    10);
INSERT INTO EMP VALUES (10,'TURNER','SALESMAN', 1500,    30);
INSERT INTO EMP VALUES (11,'ADAMS', 'CLERK',    1500,    20);


SQL> SELECT deptno, job, SUM(sal),
  2  DENSE_RANK() OVER (ORDER BY SUM(sal) DESC) AS rank
  3  FROM emp
  4  GROUP BY GROUPING SETS(deptno, job)
  5  ORDER BY deptno, job;

    DEPTNO JOB         SUM(SAL)       RANK
---------- --------- ---------- ----------
        10                 5850          4
        20                 8275          3
        30                 8450          2
           ANALYST         3000          6
           CLERK           2300          7
           MANAGER         8675          1
           PRESIDENT       3000          6
           SALESMAN        5600          5

8 rows selected.

SQL>

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DENSE_RANK: