1，使用实例：
SELECT t1, t2, aggregate_function(t3)
FROM table
GROUP BY ROLLUP (t1, t2);
2，ROLLUP的列名称修改，使用实例：
SELECT
COALESCE(t1, '自定义列名')t1, aggregate_function(t3)
FROM table
GROUP BY ROLLUP t1;
3，ROLLUP的分组使用，使用实例：
SELECT t1, t2, aggregate_function(t3)
FROM table
GROUP BY t1, ROLLUP (t1, t2);
标签：function,GROUP,t2,ROLLUP,t1,SQL,行求,SELECT From： https://www.cnblogs.com/youngnote/p/16845159.html