ROLLUP和CUBE都是“小计”功能。

配合上GROUP BY，可以进行分组小计。

配合例子进行说明：

SELECT * FROM GROUP_TEST G;

SELECT G.GROUP_ID,SUM(G.SALARY) FROM GROUP_TEST G GROUP BY G.GROUP_ID;

SELECT G.GROUP_ID,SUM(G.SALARY) FROM GROUP_TEST G GROUP BY ROLLUP(G.GROUP_ID);

SELECT G.GROUP_ID,G.JOB,SUM(G.SALARY) FROM GROUP_TEST G GROUP BY ROLLUP(G.GROUP_ID,G.JOB);

SELECT G.GROUP_ID,SUM(G.SALARY) FROM GROUP_TEST G GROUP BY CUBE(G.GROUP_ID,G.JOB);