标签:sig bsp values html http OLE creat save www.
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);
标签:sig bsp values html http OLE creat save www.
原文地址:https://www.cnblogs.com/mark-to-win/p/10078110.html