From f2b42763c5922b6daf8a5e2446807d187eb8249b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=94=A1=E5=98=89=E4=B9=90?= <3196825236@qq.com>
Date: Thu, 7 Sep 2023 02:38:37 +0000
Subject: [PATCH] =?UTF-8?q?13=20=E8=94=A1=E5=98=89=E4=B9=90?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Signed-off-by: 蔡嘉乐 <3196825236@qq.com>
---
 ...30\347\272\247\344\275\234\344\270\232.md" | 95 +++++++++++++++++++
 ...\344\270\200\350\212\202\350\257\276md.md" |  6 ++
 ...54\344\272\214\350\212\202\350\257\276.md" | 14 +++
 3 files changed, 115 insertions(+)
 create mode 100644 "0906\346\225\260\346\215\256\345\272\223\351\253\230\347\272\247\344\275\234\344\270\232.md"
 create mode 100644 "9.5\347\254\254\344\270\200\350\212\202\350\257\276md.md"
 create mode 100644 "9.6\347\254\254\344\272\214\350\212\202\350\257\276.md"

diff --git "a/0906\346\225\260\346\215\256\345\272\223\351\253\230\347\272\247\344\275\234\344\270\232.md" "b/0906\346\225\260\346\215\256\345\272\223\351\253\230\347\272\247\344\275\234\344\270\232.md"
new file mode 100644
index 0000000..7de2bdd
--- /dev/null
+++ "b/0906\346\225\260\346\215\256\345\272\223\351\253\230\347\272\247\344\275\234\344\270\232.md"
@@ -0,0 +1,95 @@
+create database school charset utf8;
+
+use school;
+
+-- 院系
+create table department(
+	d_id int primary key,
+	d_name varchar(10),
+	d_address varchar(10)
+);
+insert into department values
+(1,'软件工程学院','望云楼');
+
+-- 专业
+create table speciality(
+	s_id int primary key,
+	s_name varchar(10),
+	d_id int,
+	foreign key (d_id) references department(d_id)
+);
+insert into speciality values
+(100,'软件技术',1);
+
+-- 教室
+create table classroom(
+r_id int PRIMARY KEY,
+r_name varchar(10)
+);
+insert into classroom values
+(1,'实训四'),
+(2,'实训八');
+
+-- 班级
+create table class(
+	c_id int primary key,
+	c_name varchar(10),
+	s_id int,
+	foreign key (s_id) references speciality(s_id)
+);
+insert into class values
+(1,'软件技术1班',100),
+(2,'软件技术2班',100);
+
+-- 课程
+CREATE TABLE course(
+	couseId int PRIMARY key,
+	courseName varchar(10),
+	c_id int,
+	r_id int,
+	foreign key (c_id) references class(c_id),
+	foreign key (r_id) references classroom(r_id)
+);
+insert into course VALUES
+(1,'Java',1,1),
+(2,'MySQL',2,2);
+
+-- 教师
+create table teacher(
+	t_id int primary key,
+	t_name varchar(10),
+	couseId int,
+	foreign key (couseId) references course(couseId)
+);
+insert into teacher values
+(1,'一一',1),
+(2,'阿九',2);
+
+-- 课程表
+create table `select` (
+	selectId int primary key,
+	couseId int,
+	time varchar(20),
+	t_id int,
+	r_id int,
+	foreign key (couseId) references course(couseId),
+	foreign key (t_id) references teacher(t_id),
+	foreign key (r_id) references classroom(r_id)
+);
+insert into `select` values
+(1,1,'周一8:00-11:40',2,1),
+(2,2,'周一14:00-17:40',1,2);
+
+-- 学生
+create table student (
+	id int primary key,
+	name varchar(10),
+	c_id int,
+	selectId int,
+	foreign key (c_id) references class(c_id),
+	foreign key (selectId) references `select`(selectId)
+);
+insert into student values
+(2201,'张三',1,1),
+(2202,'李四',2,2),
+(2203,'王五',1,1);
\ No newline at end of file
diff --git "a/9.5\347\254\254\344\270\200\350\212\202\350\257\276md.md" "b/9.5\347\254\254\344\270\200\350\212\202\350\257\276md.md"
new file mode 100644
index 0000000..89ef007
--- /dev/null
+++ "b/9.5\347\254\254\344\270\200\350\212\202\350\257\276md.md"
@@ -0,0 +1,6 @@
+通过第一节课我发现虽然课程上了但不敢马虎 以为明年就要出去找工作了 在发现自己的技术根本在外面找不到工作。
+
+在上课时间有时候应为走神导致上半那学期成绩飘忽不定，
+
+上完第一节课侯已经知道自己的不足 现在已经在及时补救
+
diff --git "a/9.6\347\254\254\344\272\214\350\212\202\350\257\276.md" "b/9.6\347\254\254\344\272\214\350\212\202\350\257\276.md"
new file mode 100644
index 0000000..7dfa19e
--- /dev/null
+++ "b/9.6\347\254\254\344\272\214\350\212\202\350\257\276.md"
@@ -0,0 +1,14 @@
+### 数据库高级
+
+1 表与表之间的关系有 1对多  多对多 1对1 （三个）
+
+一对一：就是将其所在表的主键，放到另一个表但外键
+
+多对多：必须有第三张表，将前面两个表的主键放进来当外键
+
+1对多：将所在表的主键，放到另一个表当外键
+
+#### E-R图
+
+要素分为 实体（表），属性（字段），关系（外键约束）
+
-- 
Gitee