数据库表中一对多关系怎么设计？

Posted 2021-01-25 mark-to-win

Database Design（数据库设计）（视频下载） （全部书籍）

马克-to-win：

(一对多：one-to-many)

1) teacher and student.

(teacher表:两列id（主键）,name。
pupil表: 三列：id（主键）,name,tid(外键))

 

举例： Teacher "qixy" has two students: liyaohua,fuwenlong. Teacher "huanglaosh" has two students: mashuai,jiaxiaohu.

create table pupil(id int not null,name char(10),tid int);

create table teacher(id int not null,name char(10));

INSERT INTO pupil (id,name,tid) VALUES(1,‘liyaohua‘,1);
INSERT INTO pupil (id,name,tid) VALUES(2,‘fuwenlong‘,1);
INSERT INTO pupil (id,name,tid) VALUES(3,‘mashuai‘,2);
INSERT INTO pupil (id,name,tid) VALUES(4,‘jiaxiaohu‘,2);

详情请看：http://www.mark-to-win.com/index.html?content=Mydb/DBUrl.html&chapter=Mydb/DBIntroduction_web.html#DesignOneMany