簡(jiǎn)述

之前都是在宿舍的一個(gè)臺(tái)式電腦上寫(xiě)數(shù)據(jù)庫(kù)的作業(yè)，但是最近需要出去外面比賽，路上可能就需要寫(xiě)作業(yè)。所以就打算重新寫(xiě)一遍這個(gè)作業(yè)。順便就寫(xiě)一下答案。

jxgl這個(gè)庫(kù)之后會(huì)需要用到。

環(huán)境介紹

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

代碼以及對(duì)應(yīng)的解釋

創(chuàng)建student表
在性別上，設(shè)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(chuàng)建course表
要注意：課程表上，cpno其實(shí)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(chuàng)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(qián)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(shù)據(jù)處理基礎(chǔ)', NULL, 4); Query OK, 1 row affected (0.09 sec)mysql> insert into course value('7', 'C語(yǔ)言', 6, 3); Query OK, 1 row affected (0.08 sec)mysql> insert into course value('4', '操作系統(tǒng)原理', 6, 3); Query OK, 1 row affected (0.06 sec)mysql> insert into course value('5', '數(shù)據(jù)結(jié)構(gòu)', 7, 4); Query OK, 1 row affected (0.04 sec)mysql> insert into course value(1, '數(shù)據(jù)庫(kù)基礎(chǔ)', 5, 4); Query OK, 1 row affected (0.09 sec)mysql> insert into course value(3, '信息系統(tǒng)導(dǎo)論', 1, 3); Query OK, 1 row affected (0.10 sec)mysql> insert into course value(2, '數(shù)學(xué)分析', NULL, 2); Query OK, 1 row affected (0.10 sec)mysql>

由于之前設(shè)置了cpno到cno的一個(gè)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(shù)據(jù)

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(shù)據(jù)，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(jié)

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