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+# 数据库高级
+
+## 表之间的关系:
+
+### 1.一对一的关系：
+
+ 一个学生（学号，编号，身份证寒外键），只有一个身份证（身份证号)将其中任一表中的主键，放到另一个表当外健
+
+### 2.一对多的关系（多对一的关系）：
+
+一个班级 （班级编号），有多个学生（学生编号）班级编号将一所在的表的主键，放到多的表当外键
+
+### 3.多对多的关系：
+
+ 一个学生可以选修多门课程，一门课程可以被多个学生选修必须第三张表，将前面两个表的主键放进来当外健
+
+
+
+## 作业
+
+以我们学院的组织框架，及学习的课程来做系统，院系，专业，班级，学生，教师，课程，课程表，教室
+
+```java
+
+create database student charset utf8;
+use student;
+
+create table college(
+    co_id int primary key,
+    co_name varchar(50) not null
+);
+insert into college values
+(1,"软件工程"),
+(2,"医疗护理"),
+(3,"信息工程"),
+(4,"智能制造");
+
+create table major(
+    m_id int primary key,
+    m_name varchar(20) not null,
+    co_id int,
+    foreign key(co_id) references college(co_id)
+);
+
+insert into major values
+(1,"前端",1),
+(2,"后端",1),
+(3,"财务管理",2),
+(4,"大数据技术",3),
+(5,"电气自动化技术",4);
+
+
+create table class(
+    c_id int primary key,
+    c_name varchar(20) not null,
+    m_id int,
+    foreign key(m_id) references major(m_id)
+);
+
+insert intoclass values
+(1,"软件技术2班",2),
+(2,"软件技术7班",1),
+(3,"人力财务管理1班",3),
+(4,"大数据技术4班",4),
+(5,"电气自动化技术3班",5);
+
+
+create table student(
+    s_id int primary key,
+    s_name varchar(10) not null,
+    sex varchar(2) not null,
+    c_id int,
+    foreign key(c_id) references class(c_id)
+);
+
+insert into student values
+(1,"张三","男",1),
+(2,"李四","男",2),
+(3,"王","女",3),
+(4,"锅","男",4),
+(5,"刘","女",5);
+
+
+create table course_inf(
+    c_id int primary key,
+    c_name varchar(10) not null
+);
+
+insert into course_inf values
+(1,"MySQL"),
+(2,"java"),
+(3,"财务管理"),
+(4,"大数据"),
+(5,"电气自动化");
+
+
+create table classroom(
+    cr_id int primary key,
+    address varchar(20) not null
+);
+# 插入数据
+insert into classroom values
+(1,"望云楼实训室8"),
+(2,"望云楼阶"),
+(3,"岩声楼"),
+(4,"辛耕楼"),
+(5,"辛耕楼二楼");
+
+
+create table teacher(
+    t_id int primary key,
+    t_name varchar(5) not null,
+    sex varchar(2) not null,
+    co_id int,
+    foreign key(co_id) references college(co_id)
+);
+
+insert into teacher values
+(001,"丘老师","男",1),
+(002,"丘老师","男",1),
+(003,"刘老师","女",2),
+(004,"王老师","男",3),
+(005,"李老师","女",4);
+
+
+create table course(
+    c_id int,
+    cr_id int,
+    t_id int,
+    s_id int,
+    foreign key(c_id) references course_inf(c_id),
+    foreign key(cr_id) references classroom(cr_id),
+    foreign key(t_id) references teacher(t_id),
+    foreign key(s_id) references student(s_id)
+);
+insert into course values
+(1,1,1,1),
+(2,2,2,2),
+(3,3,3,3),
+(4,4,4,4),
+(5,5,5,5);
+
+
+```