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+## 笔记
+
+### 数据库的范式：
+
+1．第一范式：要求字段的内容不可再分割，为的是保证数据的原子性
+
+2、第二范式：要求在满足第一范式的基础上，要求非主键字段要完全依赖主键（非主键，要依赖整个联合主键），而不能只依赖部分例：小明的存在依赖于小明爸爸的存在，还得依赖小明妈妈的存在
+
+3．第三范式：满足第二范式的前提下，要求，非主键属性要直接依赖于主键
+
+注意：传递依赖现实中可以写，但不符合范式
+
+### 另
+
+picgo 上传图片
+
+亿图图示 （绘制流程图）
+
+## 头脑风暴完整版
+
+```mysql
+CREATE DATABASE yangyang charset utf8;
+use yangyang;
+##学院表
+CREATE table college(   
+collegeName VARCHAR(12),
+collegeId int PRIMARY key
+);
+
+##专业表
+CREATE TABLE major(
+majorId int PRIMARY key,
+majorName VARCHAR(12),
+collegeId int,
+foreign KEY (collegeId) references college(collegeId)
+);
+
+##班级表
+CREATE TABLE class(
+classId int PRIMARY key,
+className VARCHAR(12),
+majorId int,
+foreign KEY (majorId) references major(majorId)
+);
+
+##学生表
+CREATE TABLE student(
+studentId int PRIMARY  key,
+studentName VARCHAR(12),
+sex CHAR,
+courseId int,
+classId int,
+foreign KEY (classId) references class(classId)
+);
+
+
+##教师表
+CREATE TABLE teacher(
+teacherId int PRIMARY  key,
+teacherName VARCHAR(12),
+courseld int
+);
+
+#3教室表
+CREATE TABLE classroom(
+classroomId int PRIMARY key ,
+classroomAddress VARCHAR(12),
+classroomName VARCHAR(12)
+);
+
+
+## 课程
+CREATE TABLE course(
+courseId int PRIMARY key,
+courseName VARCHAR(12),
+teacherId int,
+foreign KEY (teacherId) references teacher(teacherId)
+);
+
+## 选修表
+
+CREATE TABLE elective (
+score int PRIMARY key,
+studentId int,
+courseId int,
+foreign KEY (studentId) references student(studentId),
+foreign KEY (courseId) references course(courseId)
+);
+
+## 课程表
+CREATE TABLE timetable(
+section int PRIMARY key ,
+tim time,
+classId int,
+classroomId int,
+courseId int,
+teacherId int,
+ foreign KEY (classId) references class(classId),
+ foreign KEY (classroomId) references classroom(classroomId),
+ foreign KEY (courseId) references course(courseId),
+ foreign KEY (teacherId) references teacher(teacherId)
+);
+
+```
+
-- 
Gitee