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1¡¢ÔÚROLLUPÖжԵ¥ÁÐʹÓÃGROUPING()
SQL> select division_id,sum(salary)
  2  from employees2
  3  group by rollup(division_id)
  4  order by division_id;
DIV SUM(SALARY)
--- -----------
BUS     1610000
OPE     1320000
SAL     4936000
SUP     1015000
        8881000
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SQL> select grouping(division_id),division_id,sum(salary)
  2  from employees2
  3  group by rollup(division_id)
  4  order by division_id;
GROUPING(DIVISION_ID) DIV SUM(SALARY)
--------------------- --- -----------
                    0 BUS     1610000
                    0 OPE     1320000
                    0 SAL     4936000
                    0 SUP     1015000
                    1         8881000
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