sql sum,group by 分组求和后在求总和,with rollup,with cube的区别
有表数据如下:createtablett(namevarchar(10),numdecimal(18,2),phint)insertintott(name,num,ph)values('test1',10,1)insertintott(name,num,ph)values('test1',30,1)insertintott(name,num,ph)values('test1',50.5,3)ins