**题目均来自社区同学遇到面试题**有一个录取学生人数表,记录的是每年录取学生人数和入学学生的学制,然后计算每年在校生人数 with data as ( -- 主键 入学年份 人数 学制 select 1 as id , 2001 as year , 1200 as stu_num , '3' as stu_len union all select 2 as id , 2000 as year , 1300 as stu_num , '5' as stu_len union all sel...