题目地址:here pat 2-05 求集合数据的均方差 没什么可说的,大水题 #include<cstdio> #include<cmath> int main() { int n; scanf("%d", &n); int data[n]; double average = 0.0; ; i < n; i++) { scanf("%d", &data[i]); average += data[i]; } averag
--1.查询全体学生的学号和姓名select sno,sname from student --2.查询全体学生的详细记录select * from student --3.查询软件学院的学生姓名,年龄,系别select sname,sage,sdept from studentwhere sdept='CS' --4.查询所有选修过课程的学生学号(不重复)select distinct sno from sc --5.查询考试不及格的学生学号(不重复)select distinct sno f