DataBase physical design

//Table:
/*student*/
create table student(id int not null primary key,    /*学号*/name varchar(20) not null,      /*姓名*/college varchar(20) not null,   /*学院*/grade int not null,             /*年级*/gender varchar(6) not null,     /*性别*/age int not null                /*年龄*/
);

Table student(学生信息)

可按上述表格形式插入

/*study*/
create table curriculum(s_id int not null,  /*学号*/c_id int not null   /*课程号*/constraint c_id_fk foreign key (c_id) references course(c_id)
);

Table curriculum(课表)

/*study*/
create table course(c_id int not null constraint primary key,   /*课程号*/teacher varchar(20) not null,   /*老师*/credit int not null,            /*学分*/signed int not null,            /*签到率*/c_difficulty int not null       /*课程难度*/
);

Table course

/*do*/
create table task(t_id varchar(7) not null constraint primary key,/*作业号(任务创立日期+编号)*//* 格式: Year+M + D  + numbere.g  7 + 12 + 16 + 02 */t_course int constraint t_c_fk foreign key references course(c_id),    /*作业所属课程*/t_deadline datetime,                /*20161210 最后期限*/t_detail varchar(20),               /*详情*/t_amount int not null,              /*1.2.3.4.5 作业数量*/t_difficulty int not null           /*1.2.3.4.5 作业难度*/
);

Table task

create table message(m_id int not null constraint primary key,/*信息号(任务创立日期+编号)格式: Year+M + D  + numbere.g  7 + 12 + 16 + 02   */type varchar(10) not null,      /*信息类型:娱乐(entertainment)兴趣(interest)工作(job)学习(study)信仰(faith)*/details varchar(30),            /*详情*/m_deadline datetime,            /*最后期限*/duration datetime,              /*持续时间*/Emergency_index int not null    /*1.2.3.4.5 紧急程度*/
);

Table message

/*live*/
create table birthday(f_name varchar(20) not null constraint primary key, /*姓名*/relation varchar(10) not null,  /*关系*/current_age int not null,       /*当前年龄*/f_gender varchar(6) not null,   /*性别*/f_birthdat datetime not null,   /*生日*/gift varchar(1) not null        /*是否需要礼物*/
);

以学号建立索引
生日表以姓名建立索引