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+经过这节课让我受益颇多，我学会了如何使用盘搜搜，VIP解析等等，也让我知道我们应该如何去使用自己用友的资源！
+
+最重要是，通过了直接课让我明白了，这学期我上课必须努力听讲，不能想以前那样无所谓，课后也要认真复习，学习更多的是靠自己的制止力！
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+```mysql
+CREATE DATABASE school charset utf8;
+use school;
+
+create TABLE college (
+college_id int PRIMARY KEY,
+college_name VARCHAR(20)
+);
+
+insert into college values 
+(1,"智能制造学院"),
+(2,"软件工程学院"),
+(3,"财经商贸学院");
+
+CREATE TABLE major(
+major_id int PRIMARY KEY,
+major_name VARCHAR(20),
+college_id int,
+foreign key (college_id) REFERENCES college(college_id)
+);
+
+insert into major VALUES
+(1,"前端",2),
+(2,"后端",2);
+
+create table class(
+class_id int PRIMARY KEY,
+class_name VARCHAR(20),
+major_id int,
+foreign key (major_id) REFERENCES major(major_id)
+);
+
+insert into class VALUES
+(1,"软件工程技术1班",2),
+(2,"软件工程技术2班",2),
+(3,"软件工程技术3班",2);
+
+create table student(
+student_id int PRIMARY KEY,
+student_name VARCHAR(20),
+student_sex varchar(1),
+student_age int,
+class_id int,
+course_id int,
+foreign key (course_id) REFERENCES course(course_id),
+foreign key (class_id) REFERENCES class(class_id)
+);
+
+insert into student VALUES
+(1,"张三","男",19,1,12),
+(2,"李四","男",19,2,23),
+(3,"王五","男",19,3,123);
+
+CREATE TABLE course(
+course_id int PRIMARY KEY,
+course_name VARCHAR(20)
+);
+
+insert into course VALUES
+(1,"java"),
+(2,"mysql"),
+(3,"c++");
+
+CREATE TABLE teache(
+teacher_id int PRIMARY KEY,
+teacher_name VARCHAR(20),
+teacher_age int,
+teacher_sex VARCHAR(1),
+course_id int,
+FOREIGN KEY (course_id) REFERENCES course(course_id)
+);
+
+insert into teacher VALUES
+(1,"苏拉",36,"男",1),
+(2,"安娜",36,"女",2),
+(3,"雪白",36,"男",3);
+
+
+```
+
+笔记
+
+一对一：将其中任意一个表放在另一个表中
+
+一对多：将一个表放多个表中
+
+多对多：第三个表前两个表主键充当外键
+
+数据库使用E-R图表示各表之间的关系
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