diff --git "a/08 \350\256\270\350\215\243\346\263\225/20230904 \347\254\254\344\270\200\350\257\276.md" "b/08 \350\256\270\350\215\243\346\263\225/20230904 \347\254\254\344\270\200\350\257\276.md"
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@@ -0,0 +1,7 @@
+vip解析（粘贴付费视频网址免费浏览）
+
+盘搜搜（搜寻网盘资料）
+
+数据库高级
+
+js
\ No newline at end of file
diff --git "a/08 \350\256\270\350\215\243\346\263\225/20230905 ER.md" "b/08 \350\256\270\350\215\243\346\263\225/20230905 ER.md"
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+++ "b/08 \350\256\270\350\215\243\346\263\225/20230905 ER.md"	
@@ -0,0 +1,78 @@
+```mysql
+create database school charset utf8;
+use school;
+create table faculty(
+num int primary key,
+name varchar(10)
+);
+
+
+create table profession(
+num int primary key,
+name varchar(10),
+fid int,
+foreign key (fid) references faculty(num)
+);
+
+
+create table class(
+cid int primary key,
+num int,
+pid int,
+foreign key (pid) references profession(num)
+);
+
+
+create table student(
+sid int primary key,
+name varchar(10),
+cid int,
+foreign key (cid) references class(cid)
+);
+
+
+create table teacher(
+tid int primary key,
+tname varchar(10)
+);
+
+
+create table classroom(
+crid int primary key,
+crname varchar(10)
+);
+
+
+create table course(
+courseid int primary key,
+coursename varchar(10),
+tid int,
+crid int,
+foreign key (tid) references teacher(tid),
+foreign key (crid) references classroom(crid)
+);
+
+
+create table score(
+score int,
+courseid int,
+sid int,
+foreign key (courseid) references course(courseid),
+foreign key (sid) references student(sid)
+);
+insert into faculty values(1,'软工'),(2,'土木');
+insert into profession values (1,'软件技术','1'),(2,'打灰抹墙',2);
+insert into class values (1,114,1),(2,514,2);
+insert into student values (33,'张三',1),(44,'李四',1),(55,'王五',2);
+insert into teacher values (1,'秃头眼镜男'),(2,'包工头');
+insert into classroom values (208,'机房'),(408,'露天工地');
+insert into course values (1,'编程',1,208),(2,'打灰',2,408);
+insert into score values (93,1,33),(94,1,44),(100,2,55);
+```
+
+
+
+笔记
+多对多时把两个主键放入第三方表写外键
+一对多时将一的主键放入多的表当外键
+一对一时任意