COMPUTE function: How to get subtotals and GRAND total together?

Question

I am wrtiting a report using SQL and SQL*Plus to get subtotals and a grand total. The COMPUTE function allows me to COMPUTE SUM on a group, but it only gives me subtotals. I'm interested in getting a report with the SUBTOTALS and a final GRAND TOTAL. Can this be done using SQL*Plus?
Here is my current code that gives me subtotals:
COMPUTE SUM LABEL subtotal OF sal ON deptno
SELECT ename, sal, deptno
FROM emp
ORDER BY deptno;
ENAME             SAL     DEPTNO
CLARK            2450         10
VOLLMAN          5000
MILLER           1300
                 8750 subtotal
SMITH             800         20
ADAMS            1100
FORD             3000
SCOTT            3000
JONES            2975
                10875 subtotal
ALLEN            1600         30
BLAKE            2850
MARTIN           1250
JAMES             950
TURNER           1500
WARD             1250
                 9400 subtotalHere is the code to give one grand total:
Column DUMMY NOPRINT
COMPUTE SUM OF sal ON DUMMY
BREAK ON DUMMY
SELECT NULL DUMMY, ename, sal, deptno
FROM emp
ORDER BY deptno;
ENAME             SAL     DEPTNO
CLARK            2450              10
VOLLMAN          5000          10
MILLER           1300          10
SMITH             800              20
ADAMS            1100          20
FORD             3000          20
SCOTT            3000          20
JONES            2975          20
ALLEN            1600              30
BLAKE            2850          30
MARTIN           1250          30
JAMES             950          30
TURNER           1500          30
WARD             1250          30
                29025
How can I combine both on one report?

Answer 1

Massimo Ruocchio wrote:
Do you like this?I believe OP is looking for both department totals and grand total. Frank already showed how to do it in SQL*Plus. To do it in SQL:
SELECT  CASE GROUPING_ID(real_deptno,real_ename)
          WHEN 0 then real_ename
          WHEN 1 then 'Department ' || real_deptno || ' total'
          ELSE 'All department total'
        END ename,
        SUM(sal),
        deptno
  FROM  (
         SELECT  deptno real_deptno,
                 ename real_ename,
                 sal,
                 CASE ROW_NUMBER() OVER(PARTITION BY deptno order by ename) WHEN 1 THEN deptno end deptno
           FROM  emp
  GROUP BY GROUPING SETS((),real_deptno,(real_deptno,deptno,real_ename))
  ORDER BY real_deptno nulls last,
           real_ename nulls last
ENAME                  SUM(SAL)     DEPTNO
CLARK                      2450         10
KING                       5000
MILLER                     1300
Department 10 total        8750
ADAMS                      1100         20
FORD                       3000
JONES                      2975
SCOTT                      3000
SMITH                       800
Department 20 total       10875
ALLEN                      1600         30
ENAME                  SUM(SAL)     DEPTNO
BLAKE                      2850
JAMES                       950
MARTIN                     1250
TURNER                     1500
WARD                       1250
Department 30 total        9400
All department total      29025
18 rows selected.
SQL> SY.