简述

之前都是在宿舍的一个台式电脑上写数据库的作业，但是最近需要出去外面比赛，路上可能就需要写作业。所以就打算重新写一遍这个作业。顺便就写一下答案。

jxgl这个库之后会需要用到。

环境介绍

windows 10

mysql 8.0 +

Command Line Client 操作

代码以及对应的解释

创建student表

在性别上，设置了只能选 男或者是女

mysql> create table student (

-> sno VARCHAR(7) NOT NULL,

-> sname VARCHAR(16),

-> ssex CHAR(2) DEFAULT '男' CHECK (ssex='男' or ssex='女'),

-> sage int,

-> sdept VARCHAR(2),

-> PRIMARY KEY(sno)) ENGINE = InnoDb;

Query OK, 0 rows affected (0.20 sec)

创建course表

要注意：课程表上，cpno其实是course表本身的cno的外键。

mysql> create table course (

-> cno VARCHAR(2) NOT NULL,

-> cname VARCHAR(20),

-> cpno VARCHAR(2) NULL,

-> credit int,

-> PRIMARY KEY(cno),

-> FOREIGN key(cpno) references course(cno)) ENGINE = InnoDB;

Query OK, 0 rows affected (0.17 sec)

mysql>

创建sc表

mysql> create table sc (

-> sno VARCHAR(7) NOT NULL,

-> cno VARCHAR(7) NOT NULL,

-> grade int NULL check (grade is NULL or( grade between 0 and 100)),

-> PRIMARY KEY(sno, cno),

-> Foreign Key(sno) references student(sno),

-> Foreign Key(cno) references course(cno))ENGINE=InnoDB;

Query OK, 0 rows affected (0.18 sec)

插入是student表

mysql> insert into student value('2005001', '钱横', '男', 18, 'Cs');

Query OK, 1 row affected (0.04 sec)

mysql> insert into student value('2005002', '王林', '女', 19, 'Cs');

Query OK, 1 row affected (0.06 sec)

mysql> insert into student value('2005003', '李民', '男', 20, 'Is');

Query OK, 1 row affected (0.06 sec)

mysql> insert into student value('2005004', '赵欣然', '女', 16, 'Ma');

Query OK, 1 row affected (0.17 sec)

插入课程表course

mysql> insert into course value('6', '数据处理基础', NULL, 4);

Query OK, 1 row affected (0.09 sec)

mysql> insert into course value('7', 'C语言', 6, 3);

Query OK, 1 row affected (0.08 sec)

mysql> insert into course value('4', '操作系统原理', 6, 3);

Query OK, 1 row affected (0.06 sec)

mysql> insert into course value('5', '数据结构', 7, 4);

Query OK, 1 row affected (0.04 sec)

mysql> insert into course value(1, '数据库基础', 5, 4);

Query OK, 1 row affected (0.09 sec)

mysql> insert into course value(3, '信息系统导论', 1, 3);

Query OK, 1 row affected (0.10 sec)

mysql> insert into course value(2, '数学分析', NULL, 2);

Query OK, 1 row affected (0.10 sec)

mysql>

由于之前设置了cpno到cno的一个外键，所以，需要按特定的顺序完成。

mysql> insert into sc value('2005001', 1, 87);

Query OK, 1 row affected (0.02 sec)

mysql> insert into sc value('2005001', 2, 67);

Query OK, 1 row affected (0.02 sec)

mysql> insert into sc value('2005001', 3, 90);

Query OK, 1 row affected (0.07 sec)

mysql> insert into sc value('2005002', 2, 95);

Query OK, 1 row affected (0.04 sec)

mysql> insert into sc value('2005003', 3, 88);

Query OK, 1 row affected (0.06 sec)

在第五章里面插入的一些数据

mysql> insert into student values ('2005007', '李涛', '男', 19, 'Is');

Query OK, 1 row affected (0.18 sec)

mysql> insert into student values ('2005008', '陈高', '女', 21, 'At'),

-> ('2005009', '张杰', '男', 17, 'At');

Query OK, 2 rows affected (0.03 sec)

Records: 2 Duplicates: 0 Warnings: 0

再插入一些数据，下面是添加一些人

mysql> insert into student values ('2005010', '赵青江', '男', 18, 'Cs');

Query OK, 1 row affected (0.04 sec)

mysql> insert into student values ('2005011', '张丽萍', '女', 19, 'Ch');

Query OK, 1 row affected (0.01 sec)

mysql> insert into student values ('2005012', '陈景欢', '男', 20, 'Is');

Query OK, 1 row affected (0.04 sec)

mysql> insert into student values ('2005013', '陈婷婷', '女', 16, 'Ph');

Query OK, 1 row affected (0.09 sec)

mysql> insert into student values ('2005014', '李军', '女', 16, 'Ph');

Query OK, 1 row affected (0.05 sec)

再添加一些选课的记录

mysql> insert into sc values ('2005010', 1, 87);

Query OK, 1 row affected (0.06 sec)

mysql> insert into sc values ('2005010', 2, NULL);

Query OK, 1 row affected (0.07 sec)

mysql> insert into sc values ('2005010', 3, 80);

Query OK, 1 row affected (0.04 sec)

mysql> insert into sc values ('2005010', 4, 87);

Query OK, 1 row affected (0.01 sec)

mysql> insert into sc values ('2005010', 6, 85);

Query OK, 1 row affected (0.02 sec)

mysql> insert into sc values ('2005011', 1, 52);

Query OK, 1 row affected (0.10 sec)

mysql> insert into sc values ('2005011', 2, 47);

Query OK, 1 row affected (0.01 sec)

mysql> insert into sc values ('2005011', 3, 53);

Query OK, 1 row affected (0.04 sec)

mysql> insert into sc values ('2005011', 5, 45);

Query OK, 1 row affected (0.06 sec)

mysql> insert into sc values ('2005012', 1, 84);

Query OK, 1 row affected (0.07 sec)

mysql> insert into sc values ('2005012', 3, NULL);

Query OK, 1 row affected (0.05 sec)

mysql> insert into sc values ('2005012', 4, 67);

Query OK, 1 row affected (0.02 sec)

mysql> insert into sc values ('2005012', 5, 81);

Query OK, 1 row affected (0.02 sec)