orderbysalrowsbetweenunboundedprecedingandcurrentrow)salsumfr
sum(id)over(orderbyid rangebetweenunboundedprecedingandcurrent
name,month,num2,示例比如说 rows between unbounded preceding and
起点到当前行的聚合between unbounded preceding and current row2.
orderbysalrowsbetweenunboundedprecedingandcurrentrow)salsumfr