Day 7(11.14):(9)练习-1

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-- 准备工作：
create table stu_info
(
t_number char(8),
t_name varchar(10),
t_gender char(2),
t_birthday datetime
)

create table course
(
c_number char(6),
c_name varchar(20),
c_credit int,
c_hour int,
c_teacher varchar(10)
)

create table exam
(
t_number char(8),
c_number char(6),
t_grade decimal(5,2)
)

drop table exam
drop table course
drop table stu_info
--向stu_info表插入数据
insert into stu_info values('20040301','张华','女','19840113')
insert into stu_info values('20040302','王立','男','19830624')
insert into stu_info values('20040303','蒋超','男','19841115')
insert into stu_info values('20040304','王浩雨','男','19851020')
insert into stu_info values('20040305','张静','女','19840418')
insert into stu_info values('20050301','李华','女','19830113')
insert into stu_info values('20050302','张立','男','19840624')
insert into stu_info values('20050303','黄超','男','19851125')
insert into stu_info values('20050304','汪雨','男','19861020')
insert into stu_info values('20050305','王静','女','19850418')

--向course表插入数据
insert into course values('100101','高等数学',2,60,'赵金')
insert into course values('100102','大学英语',3,80,'王维')
insert into course values('100103','大学物理',2,60,'李华')
insert into course values('100104','大学英语',4,80,'刘杰')
insert into course values('100105','大学英语',NULL,80,'刘杰')

--向exam表插入数据
insert into exam values('20040301','100101',79)
insert into exam values('20040301','100102',88)
insert into exam values('20040302','100101',90)
insert into exam values('20040302','100103',75)
insert into exam values('20040303','100101',79)
insert into exam values('20040303','100102',75)
insert into exam values('20040303','100103',95)
insert into exam values('20040304','100102',43)
insert into exam values('20040304','100103',68)
insert into exam values('20040305','100101',64)
insert into exam values('20040305','100102',87)
insert into exam values('20040305','100103',92)

-- 练习：

-- 1. 编写用户定义函数,要求根据学生学号、课程号查找出考试成绩。并调用函数查看学号为20040301、课程号为100101的成绩。

-- 2. 编写用户定义函数,要求根据姓名得到该学生的学生姓名和各科考试成绩。并调用函数查看学号为20040301的考试成绩

-- 3. 编写用户定义函数。要求得到每个学生的学生编号、学生姓名以及该学生的平均分。并调用函数查看查找每个

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