Database Design(資料庫設計)(視頻下載) (全部書籍) 馬克-to-win: (一對多:one-to-many) 1) teacher and student. (teacher表:兩列id(主鍵),name。pupil表: 三列:id(主鍵),name,tid(外鍵)) 舉例: T ...
Database Design(資料庫設計)(視頻下載) (全部書籍)
馬克-to-win:
(一對多:one-to-many)
1) teacher and student.
(teacher表:兩列id(主鍵),name。
pupil表: 三列:id(主鍵),name,tid(外鍵))
舉例: 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);