簡述

之前都是在宿舍的一個臺式電腦上寫數據庫的作業，但是最近需要出去外面比賽，路上可能就需要寫作業。所以就打算重新寫一遍這個作業。順便就寫一下答案。

jxgl這個庫之后會需要用到。

環境介紹

• windows 10
• mysql 8.0 +
• Command Line Client 操作

代碼以及對應的解釋

創建student表
在性別上，設置了只能選 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)

創建course表
要注意：課程表上，cpno其實是course表本身的cno的外鍵。

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>

創建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', '錢橫', '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', '趙欣然', '女', 16, 'Ma'); Query OK, 1 row affected (0.17 sec)

插入課程表course

mysql> insert into course value('6', '數據處理基礎', NULL, 4); Query OK, 1 row affected (0.09 sec)mysql> insert into course value('7', 'C語言', 6, 3); Query OK, 1 row affected (0.08 sec)mysql> insert into course value('4', '操作系統原理', 6, 3); Query OK, 1 row affected (0.06 sec)mysql> insert into course value('5', '數據結構', 7, 4); Query OK, 1 row affected (0.04 sec)mysql> insert into course value(1, '數據庫基礎', 5, 4); Query OK, 1 row affected (0.09 sec)mysql> insert into course value(3, '信息系統導論', 1, 3); Query OK, 1 row affected (0.10 sec)mysql> insert into course value(2, '數學分析', NULL, 2); Query OK, 1 row affected (0.10 sec)mysql>

由于之前設置了cpno到cno的一個外鍵，所以，需要按特定的順序完成。

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數據

mysql> insert into student values ('2005007', '李濤', '男', 19, 'Is'); Query OK, 1 row affected (0.18 sec) mysql> insert into student values ('2005008', '陳高', '女', 21, 'At'),-> ('2005009', '張杰', '男', 17, 'At'); Query OK, 2 rows affected (0.03 sec) Records: 2 Duplicates: 0 Warnings: 0

再插入一些數據，下面是添加一些人

mysql> insert into student values ('2005010', '趙青江', '男', 18, 'Cs'); Query OK, 1 row affected (0.04 sec)mysql> insert into student values ('2005011', '張麗萍', '女', 19, 'Ch'); Query OK, 1 row affected (0.01 sec)mysql> insert into student values ('2005012', '陳景歡', '男', 20, 'Is'); Query OK, 1 row affected (0.04 sec)mysql> insert into student values ('2005013', '陳婷婷', '女', 16, 'Ph'); Query OK, 1 row affected (0.09 sec)mysql> insert into student values ('2005014', '李軍', '女', 16, 'Ph'); Query OK, 1 row affected (0.05 sec)

再添加一些選課的記錄

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)

總結

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