CREATE TABLE T(A INT, B INT, C VARCHAR2(4));
INSERT INTO T VALUES (1, 10, 'A');
INSERT INTO T VALUES (1, 10, 'B');
INSERT INTO T VALUES (1, 10, 'C');
INSERT INTO T VALUES (2, 5, 'A');
INSERT INTO T VALUES (2, 5, 'B');

SELECT DECODE(GROUPING(A), 1, NULL, B) A,
       DECODE(GROUPING(B), 1, SUM(B), B) B,
       C
  FROM T
 GROUP BY ROLLUP(A, (B, C))
 HAVING GROUPING_id(a,B)<>3 
 ;
返回:

10    10    A
10    10    B
10    10    C
    30    
5    5    A
5    5    B
    10