#1.
create database stusys;
use stusys;
create table StudentInfo
(
sno char(6) not null primary key comment '学号',
sname char(8) not null comment '姓名',
ssex char(2) not null default '男' comment '性别',
sbirthday date not null comment '出生日期',
speciality char(12) null comment '专业',
tc tinyint null comment '专业分'
)comment '学生表1';
use stusys;
insert into studentinfo
values
('191001','刘清泉','男','1998-06-21','计算机',52),
('191002','张慧玲','女','1999-11-07','计算机',50),
('191003','冯涛','男','1999-08-12','计算机',52),
('196001','董明霞','女','1999-05-02','通信',50),
('196002','李茜','女','1998-07-25','通信',48),
('196003','周俊文','男','1998-03-10','通信',52);
select * from studentinfo;
#2.
use stusys;
create table courseInfo
(
cno char(4) not null primary key comment '课程号',
cname char(8) not null comment '课程名',
credit char(2) null comment '学分'
)comment '课程表';
use stusys;
insert into courseinfo
values
('1004','数据库系统','4'),
('1017','操作系统','3'),
('4002','数字电路','3'),
('8001','高等数学','4'),
('1201','英语','4');
select * from courseinfo;
#3.
use stusys;
create table scoreInfo
(
sno char(6) not null comment '学号',
cno char(4) not null comment '课程号',
grade tinyint null comment '成绩',
primary key(sno,cno)
)comment '成绩表';
use stusys;
insert into scoreinfo
values
('191001','1004','95'),
('191002','1004','87'),
('191003','1004','93'),
('196001','4002','90'),
('196002','4002','79'),
('196004','4002','88'),
('191001','8001','92'),
('191002','8001','88'),
('191003','8003','84'),
('196001','8001','87'),
('196002','8001',NULL),
('196004','8001','94'),
('191001','1201','92'),
('191002','1201','78'),
('191003','1201','93'),
('196001','1201','84'),
('196002','1201','76'),
('196004','1201','92');
select * from scoreinfo;
#4.
use stusys;
create table teacherInfo
(
tno char(6) not null primary key comment '教师编号',
tname char(8) not null comment '姓名',
tsex char(2) not null default '男' comment '性别',
tbirthday date not null comment '出生日期',
title char(12) null comment '职称',
school char(12) null comment '学院'
)comment '教师表';
use stusys;
insert into teacherinfo
values
('100006','何艺杰','男','1970-06-23','教授','计算机学院'),
('100023','孙浩然','男','1979-04-09','教授','计算机学院'),
('400017','李亚兰','女','1988-11-04','讲师','通信学院'),
('800028','袁万明','男','1978-08-15','副教授','数学学院'),
('120046','刘颖','女','1976-12-15','副教授','外国语学院');
select * from teacherinfo; 
#5.
use stusys;
create table lectureInfo
(
sno char(6) not null comment '教师编号',
cno char(4) not null comment '课程号',
location char(10) null comment '上课地点',
primary key(sno,cno)
)comment '讲座表';
use stusys;
insert into lectureinfo
values
('100006','1004','2-311'),
('400017','4002','1-106'),
('800028','8001','6-104'),
('120046','1201','6-215');
select * from lectureinfo; 