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+1. 未来学习计划
+
+2. 辅助/自学的工具
+
+   ​			1.github全球正版
+
+   ​			2.gitee中国式版本
+
+   ​			3.csdn
+
+   ​			4.bilibili
+
+3. 技术栈与技能树的含义
+
+   1.技术栈:指的是实现一个软件的功能所需要的技术
+
+   2.技能数:指的是一个人所掌握的技能
+
+
+
diff --git a/2023-09-06.md b/2023-09-06.md
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+## 笔记：
+
+##### 	一.数据库设计：
+
+​			1.表与表之间的关系
+
+​						多对多：引入第三张表
+
+​						一对多：主键放入多的表当外键
+
+​						一对一：将一个表的主键放入另一个表当外键
+
+​			2.E-R图
+
+​						实体（表）
+
+​						属性（字段）
+
+​						关系（联系）						
+
+```mysql
+create database school character set utf8;
+use school;
+#院系表
+create table department
+(
+    department_id   int auto_increment primary key,		 #学院编号
+    department_name varchar(50) not null				#学院名字
+);
+insert into department
+values (null, '软件工程学院');
+#专业表
+create table major
+(
+    major_id      int auto_increment primary key,		 #专业编号
+    major_name    varchar(20) not null,					#专业名称
+    department_id int,								   #所属学院编号
+    constraint foreign key (department_id) references department (department_id)
+);
+insert into major
+values (null, '软件技术', 1),
+       (null, '新媒体运营', 1);
+#班级表
+create table grade
+(
+    grade_id   int auto_increment primary key,			 #班级编号
+    grade_name varchar(20) not null,					#班级名字
+    major_id   int         not null,					#所属专业编号
+    constraint foreign key (major_id) references major (major_id)
+);
+insert into grade
+values (null, '软件技术1班', 1),
+       (null, '软件技术2班', 1),
+       (null, '新媒体运营1班', 2);
+
+#学生表
+create table student
+(
+    student_id     int,									#学生编号
+    student_name   varchar(20),							 #学生名字
+    student_age    int, 								 #学生年龄
+    student_number int primary key,						  #学生学号
+    grade_id       int,  								 #所属班级编号
+    constraint foreign key (grade_id) references grade (grade_id)
+);
+insert into student
+values (1, 'kaixin', 20, 2044010111, 1),
+       (2, 'tianxin', 20, 2044010112, 1),
+       (3, 'xiaoxin', 21, 2044010123, 2);
+#教师表
+create table teacher
+(
+    teacher_num  int         not null primary key,			 #教师工号
+    teacher_name varchar(20) not null,						#教师姓名
+    teacher_age  int         null							#教师年龄
+);
+insert into teacher
+values (0001, '张老师', 40),
+       (0002, '李老师', 35);
+#课程
+create table course
+(
+    course_id      int auto_increment primary key,			 #课程编号
+    course_name    varchar(20) not null,					#课程名字
+    teacher_number int，  								   #教师工号
+    constraint foreign key (teacher_number) references teacher (teacher_num)
+);
+insert into course
+values (1, 'mysql', 0001),
+       (2, 'java', 0002);
+#成绩表
+create table score
+(
+    course_id      int,										# 课程编号
+    score_number   int,										#成绩
+    student_number int,										#学号
+    constraint foreign key (student_number) references student (student_number),
+    constraint foreign key (course_id) references course (course_id)
+);
+insert into score
+values (1, 89, 2044010111),
+       (2, 78, 2044010111),
+       (1, 61, 2044010112),
+       (2, 77, 2044010112),
+       (1, 93, 2044010123),
+       (2, 88, 2044010123);
+#课程表
+create table course_table
+(
+    course_table_id int,								#课程表编号
+    course_name     varchar(20),						 #课程名字
+    course_date     date,								#课程日期
+    course_time     time,								#课程时间
+    site            varchar(20),						 #地点
+    constraint foreign key (course_table_id) references grade (grade_id)
+);
+insert into course_table
+values (1, 'mysql', 20230901, 14 - 00 - 00, '教学楼xx房间');
+```
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