mysql08 表结构搭建--练习

Posted 2020-12-10 清醒吧！兄弟

搭建的表结构	要求说明：

挑战参考代码

 1 $ sudo service mysql start
 2 
 3 $ mysql -u root
 4 
 5 mysql> CREATE DATABASE gradesystem;
 6 
 7 mysql> use gradesystem
 8 
 9 mysql> CREATE TABLE student(
10     -> sid int NOT NULL AUTO_INCREMENT,
11     -> sname varchar(20) NOT NULL,
12     -> gender varchar(10) NOT NULL,
13     -> PRIMARY KEY(sid)
14     -> );
15 
16 mysql> CREATE TABLE course(
17     -> cid int NOT NULL AUTO_INCREMENT,
18     -> cname varchar(20) NOT NULL,
19     -> PRIMARY KEY(cid)
20     -> );
21 
22 mysql> CREATE TABLE mark(
23     -> mid int NOT NULL AUTO_INCREMENT,
24     -> sid int NOT NULL,
25     -> cid int NOT NULL,
26     -> score int NOT NULL,
27     -> PRIMARY KEY(mid),
28     -> FOREIGN KEY(sid) REFERENCES student(sid),
29     -> FOREIGN KEY(cid) REFERENCES course(cid)
30     -> );
31 
32 mysql> INSERT INTO student VALUES(1,\'Tom\',\'male\'),(2,\'Jack\',\'male\'),(3,\'Rose\',\'female\');
33 
34 mysql> INSERT INTO course VALUES(1,\'math\'),(2,\'physics\'),(3,\'chemistry\');
35 
36 mysql> INSERT INTO mark VALUES(1,1,1,80),(2,2,1,85),(3,3,1,90),(4,1,2,60),(5,2,2,90),(6,3,2,75),(7,1,3,95),(8,2,3,75),(9,3,3,85);

  

 

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