diff --git "a/31\345\220\264\346\254\243\347\207\225/\344\275\234\344\270\232/2022-09-16\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223.md.md" "b/31\345\220\264\346\254\243\347\207\225/\344\275\234\344\270\232/2022-09-16\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223.md.md"
new file mode 100644
index 0000000000000000000000000000000000000000..8df7d0710db9413685df3f0661bf1412323558f7
--- /dev/null
+++ "b/31\345\220\264\346\254\243\347\207\225/\344\275\234\344\270\232/2022-09-16\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223.md.md"
@@ -0,0 +1,82 @@
+if exists (select * from sys.databases where name='DBTEST')
+drop database DBTEST
+
+--创建数据库
+create database DBTEST
+--使用数据库
+use DBTEST
+--创建部门信息表
+create table sectionInfo(
+	--部门编号
+	sectionID int identity(1,1) primary key,
+	--部门名称
+	sectionName varchar(10) not null
+);
+--插入数据
+insert into sectionInfo(sectionName) values ('财政部')
+insert into sectionInfo(sectionName) values ('法务部')
+insert into sectionInfo(sectionName) values ('炫饭部')
+insert into sectionInfo(sectionName) values ('睡觉部')
+insert into sectionInfo(sectionName) values ('娱乐部')
+--查询表
+select * from sectionInfo
+--员工信息表
+create table userInfo(
+	--员工编号
+	userNo int identity(1,1) primary key not null,
+	--员工姓名
+	userName varchar(10) unique not null check(len(userName)>4),
+	--员工性别
+	userSex varchar(2) not null check(userSex='男' or userSex='女'), 
+	--员工年龄
+	 userAge int not null check(userAge>1 and userAge<100),
+	 --员工地址
+	 userAddress varchar(50) default('湖北'),
+	 --员工部门
+	 userSection int references sectionInfo(sectionID) 
+);
+--插入数据
+INSERT INTO userInfo
+ (
+     userName,
+     userSex,
+     userAge,
+     userAddress,
+     userSection
+ )
+ VALUES
+ ('吴哒里个哒','女',88,  '广东省', 2),
+ ('吴跌里个跌','男',99,'山东省',5),
+  ('吴得里个得','男',99,'山东省',4),
+   ('吴哈里个哈','男',99,'山东省',2),
+    ('吴麻里个麻','男',99,'山东省',3)
+
+--查询表
+select * from userInfo
+--考勤表
+create table workInfo(
+	--考勤编号
+	workId int identity(1,1) primary key not null,
+	--考勤员工
+	userId int references userInfo(userNo) not null,
+	--考勤时间
+	workTime datetime not null,
+	--考勤说明
+	workDescription varchar(40) not null check(workDescription='迟到' or workDescription='早退' or workDescription='旷工') 
+);
+--插入数据
+INSERT INTO workInfo
+ (
+     userId,
+     workTime,
+     workDescription
+ )
+ VALUES
+ (1,GETDATE(), '迟到'),
+ (2,GETDATE(), '迟到'),
+ (3,GETDATE(), '迟到'),
+ (4,GETDATE(), '迟到'),
+ (4,GETDATE(), '迟到')
+
+--查询表
+select * from workInfo
\ No newline at end of file
diff --git "a/31\345\220\264\346\254\243\347\207\225/\344\275\234\344\270\232/2022-09-18\346\237\245\350\257\242.md.md" "b/31\345\220\264\346\254\243\347\207\225/\344\275\234\344\270\232/2022-09-18\346\237\245\350\257\242.md.md"
new file mode 100644
index 0000000000000000000000000000000000000000..1bc4a923069e64afb8b166f3e0e16f94f4a7fcc8
--- /dev/null
+++ "b/31\345\220\264\346\254\243\347\207\225/\344\275\234\344\270\232/2022-09-18\346\237\245\350\257\242.md.md"
@@ -0,0 +1,46 @@
+--1. 查询出武汉地区所有的员工信息，要求显示部门名称以及员工的详细资料
+select * from People P
+inner join Department D on P.DepartmentId=D.DepartmentId
+where PeopleAddress='武汉' 
+--2. 查询出武汉地区所有的员工信息，要求显示部门名称，职级名称以及员工的详细资料
+select * from People P
+inner join Department D on P.DepartmentId=D.DepartmentId
+inner join Rank R on P.RankId=R.RankId
+where PeopleAddress='武汉'
+--3. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资。
+select D.DepartmentName,count(D.DepartmentId)员工人数,SUM(P.PeopleSalary)员工工资总和,AVG(P.PeopleSalary)平均工资,MAX(P.PeopleSalary)最高工资,MIN(P.PeopleSalary)最低工资 from People P
+inner join Department D on P.DepartmentId=D.DepartmentId 
+group by D.DepartmentName
+--4. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，平均工资在10000 以下的不参与统计，并且根据平均工资降序排列。
+select D.DepartmentName,COUNT(D.DepartmentId)员工人数,SUM(P.PeopleSalary)员工工资总和,AVG(P.PeopleSalary)平均工资,MAX(P.PeopleSalary)最高工资,MIN(P.PeopleSalary)最低工资 from People P
+inner join Department D on P.DepartmentId=D.DepartmentId
+group by D.DepartmentName
+having AVG(P.PeopleSalary)>=10000
+order by AVG(P.PeopleSalary) desc
+--5. 根据部门名称，然后根据职位名称，分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资
+select D.DepartmentName,R.RankName,count(D.DepartmentId)员工人数,SUM(P.PeopleSalary)员工工资总和,AVG(P.PeopleSalary)员工平均工资,max(P.PeopleSalary)最高工资,min(P.PeopleSalary)最低工资 from People P
+inner join Department D on P.DepartmentId=D.DepartmentId
+inner join Rank R on P.RankId=R.RankId
+group by D.DepartmentName, R.RankName
+--6.查询出巨蟹 6.22--7.22 的员工信息
+select * from People
+where (MONTH(PeopleBirth)=6 and DAY(PeopleBirth)>=22) or (MONTH(PeopleBirth)=7 and DAY(PeopleBirth)<=22)
+--7.查询所有员工信息，添加一列显示属相(鼠,牛,虎,兔,龙,蛇,马,羊,猴,鸡,狗,猪)
+select *,
+(
+	case
+		when YEAR(PeopleBirth)%12 =0 then '鼠'
+		when YEAR(PeopleBirth)%12 =1 then '牛'
+		when YEAR(PeopleBirth)%12 =2 then '虎'
+		when YEAR(PeopleBirth)%12 =3 then '兔'
+		when YEAR(PeopleBirth)%12 =4 then '龙'
+		when YEAR(PeopleBirth)%12 =5 then '蛇'
+		when YEAR(PeopleBirth)%12 =6 then '马'
+		when YEAR(PeopleBirth)%12 =7 then '羊'
+		when YEAR(PeopleBirth)%12 =8 then '猴'
+		when YEAR(PeopleBirth)%12 =9 then '鸡'
+		when YEAR(PeopleBirth)%12 =10 then '狗'
+		else '猪'
+		end
+)属相
+ from People
\ No newline at end of file
diff --git "a/31\345\220\264\346\254\243\347\207\225/\347\254\224\350\256\260/\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223.md.md" "b/31\345\220\264\346\254\243\347\207\225/\347\254\224\350\256\260/\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223.md.md"
new file mode 100644
index 0000000000000000000000000000000000000000..04010e7a49a3fcd0bd384634d9562c5fd3b5c27b
--- /dev/null
+++ "b/31\345\220\264\346\254\243\347\207\225/\347\254\224\350\256\260/\345\210\233\345\273\272\346\225\260\346\215\256\345\272\223.md.md"
@@ -0,0 +1,60 @@
+```
+关系型数据库:SQL server, Mysql, Oracle 
+创建数据库：create database 数据库名
+database:数据库
+
+if exists (select * from sys.databases where name='DBTEST')
+ drop database DBTEST
+
+ create database DBTEST
+
+ 使用数据库
+ use dbtest
+
+ 创建班级表
+ create table ClassInfo(
+	ClassId int primary key identity(1,1),
+	ClassName varchar(20)
+ );
+
+ 插入数据： insert [into] 表名(字段名) values(值)
+ insert into ClassInfo( ClassName) values('软件1班');
+ 
+ insert ClassInfo values('软件2班')
+
+ select * from ClassInfo
+
+ 创建数据表
+ create table StuInfo(
+	stuId int primary key identity(1001,1),  --学生ID
+	添加一个检查约束，判断用户插入/新增的数据，性别字段是不是男或者女
+	default:默认约束
+	check
+	stugender varchar(2) not null default('男') check(stugender='男' or stugender='女'),   --学生性别
+	stuphone char(11) check(len(stuphone)=11) unique,
+	--创建班级外键
+	--ClassID int references ClassInfo(ClassID)
+	ClassID int
+	
+ );
+
+
+ 增加外键
+ 修改表结构 表名 add constraint 约束名 foreign key(要引用的字段) references 主键表(字段)
+ Alter table StuInfo add constraint FK_StuInfo_ClassId foreign key(ClassID) references ClassInfo(ClassID)
+
+
+ 新增姓名列
+ alter table StuInfo add stuName varchar(20)
+
+
+
+ 如果没给出列名，默认是按照顺序一个个添加
+ insert StuInfo values('女',13888888888)
+
+ insert StuInfo(stuphone) values(15888888888)
+
+
+
+ select * from StuInfo;
+```
\ No newline at end of file
diff --git "a/31\345\220\264\346\254\243\347\207\225/\347\254\224\350\256\260/\346\237\245\350\257\2421.md" "b/31\345\220\264\346\254\243\347\207\225/\347\254\224\350\256\260/\346\237\245\350\257\2421.md"
new file mode 100644
index 0000000000000000000000000000000000000000..d54ca67cafef4a421deb630aa7bef4e7abf07aca
--- /dev/null
+++ "b/31\345\220\264\346\254\243\347\207\225/\347\254\224\350\256\260/\346\237\245\350\257\2421.md"
@@ -0,0 +1,86 @@
+--查询公司员工所在城市（不需要重复数据）
+--distinct
+select distinct PeopleAddress from People 
+
+--查询所有员工信息(根据工资排序(order by)，降序排列)
+select * from People order by PeopleSalary desc
+
+
+--查询1980年以后出生的员工信息
+select * from People where year(PeopleBirth)>=1980
+
+
+--查询出巨蟹 6.22--7.22 的员工信息
+
+--查询出和赵云在同一个城市的人
+
+
+select * from People where PeopleAddress=(select peopleAddress from People where PeopleName='赵云')
+
+--查询出电话号码开头138的员工信息,第4位可能是7，可能8 ，最后一个号码是5
+select * from people
+where PeoplePhone like '138[7-9]%5'  --789
+
+--查询出电话号码开头133的员工信息,第4位是2-5之间的数字 ，最后一个号码不是2和3
+select * from people
+where PeoplePhone like '138[2-5]%[^23]'
+
+
+--求出年龄比平均年龄高的人员信息
+--平均年龄：今年-出生年份
+select avg(year(getdate())-year(peoplebirth)) 平均年龄 from People
+
+select * from people where (year(getdate())-year(peoplebirth))>(select avg(year(getdate())-year(peoplebirth)) 平均年龄 from People)
+
+--平均工资
+select avg(PeopleSalary) 平均工资 from People
+
+--保留小数点后2位
+--round(小数,保留位数)
+select round(avg(PeopleSalary),2) 平均工资 from People
+
+--convert 02154.13200 decimal(5,2):保留小数后2位，有效数字总共是5
+
+--convert和cast 可以强制转换数据类型
+select convert(decimal(13,2),avg(PeopleSalary)) 平均工资 from People
+
+--cast
+select cast(avg(PeopleSalary) as decimal(13,2)) 平均工资 from People
+
+
+--根据员工所在地区分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，
+--要求筛选出员工人数至少在2人及以上的记录，并且1985年及以后出身的员工不参与统计。
+--count(*):空值也统计 count(字段)：当前字段的空值不统计
+select count(*) 员工人数,sum(PeopleSalary) 工资总和, max(PeopleSalary) 最高工资,min(PeopleSalary) 最低工资 from People 
+where year(PeopleBirth)<1985
+group by PeopleAddress
+having count(*)>=2
+
+
+--删除数据
+delete from People where PeopleName='蜗牛' 
+
+--删除
+--drop 删除整张表
+--truncate删除整张表，表还在
+
+--根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，平均工资在10000 以下的不参与统计，并且根据平均工资降序排列。
+select count(*) 员工人数, sum(PeopleSalary) 员工工资总和,convert(decimal(15,2),avg(PeopleSalary)) 平均工资 from Department de
+join People po on de.DepartmentId = po.DepartmentId
+group by po.DepartmentId having avg(PeopleSalary)>=10000
+order by 平均工资 desc
+
+create table B(
+	cid int primary key,
+	cname varchar(20)
+)
+
+
+create table A(
+	sid int,
+	sname varchar(10),
+	cid int references B(cid)
+)
+
+select * from A 
+left join B on A.cid=B.cid
\ No newline at end of file
diff --git "a/50\350\234\227\347\211\233/\347\254\224\350\256\260/2022-09-15-\347\240\201\344\272\221\346\217\220\344\272\244\347\254\224\350\256\260.md" "b/50\350\234\227\347\211\233/\347\254\224\350\256\260/2022-09-15-\347\240\201\344\272\221\346\217\220\344\272\244\347\254\224\350\256\260.md"
deleted file mode 100644
index 35bdd145c85027a308e726da741a87dc05795a97..0000000000000000000000000000000000000000
--- "a/50\350\234\227\347\211\233/\347\254\224\350\256\260/2022-09-15-\347\240\201\344\272\221\346\217\220\344\272\244\347\254\224\350\256\260.md"
+++ /dev/null
@@ -1,29 +0,0 @@
-1.SQLServer 2014下载:
-
-https://blog.csdn.net/lililove2000/article/details/115673285
-
-2.创建数据库
-
-```sql
-create database 数据库名
-```
-
-3.创建数据表
-
-```sql
-create table 表名(
-)
-```
-
-
-
-4.数据约束
-
-5.插入数据
-
-6.修改数据
-
-7.删除数据
-
-8.查询数据
-
diff --git a/README.en.md b/README.en.md
deleted file mode 100644
index ac31e94d7051efb27325dd6be9b67641b85572e6..0000000000000000000000000000000000000000
--- a/README.en.md
+++ /dev/null
@@ -1,36 +0,0 @@
-# SQL进阶
-
-#### Description
-11
-
-#### Software Architecture
-Software architecture description
-
-#### Installation
-
-1.  xxxx
-2.  xxxx
-3.  xxxx
-
-#### Instructions
-
-1.  xxxx
-2.  xxxx
-3.  xxxx
-
-#### Contribution
-
-1.  Fork the repository
-2.  Create Feat_xxx branch
-3.  Commit your code
-4.  Create Pull Request
-
-
-#### Gitee Feature
-
-1.  You can use Readme\_XXX.md to support different languages, such as Readme\_en.md, Readme\_zh.md
-2.  Gitee blog [blog.gitee.com](https://blog.gitee.com)
-3.  Explore open source project [https://gitee.com/explore](https://gitee.com/explore)
-4.  The most valuable open source project [GVP](https://gitee.com/gvp)
-5.  The manual of Gitee [https://gitee.com/help](https://gitee.com/help)
-6.  The most popular members  [https://gitee.com/gitee-stars/](https://gitee.com/gitee-stars/)
diff --git a/README.md b/README.md
deleted file mode 100644
index 1c4b0e7c62868161068647925213862187205184..0000000000000000000000000000000000000000
--- a/README.md
+++ /dev/null
@@ -1,37 +0,0 @@
-# SQL进阶
-
-#### 介绍
-11
-
-#### 软件架构
-软件架构说明
-
-
-#### 安装教程
-
-1.  xxxx
-2.  xxxx
-3.  xxxx
-
-#### 使用说明
-
-1.  xxxx
-2.  xxxx
-3.  xxxx
-
-#### 参与贡献
-
-1.  Fork 本仓库
-2.  新建 Feat_xxx 分支
-3.  提交代码
-4.  新建 Pull Request
-
-
-#### 特技
-
-1.  使用 Readme\_XXX.md 来支持不同的语言，例如 Readme\_en.md, Readme\_zh.md
-2.  Gitee 官方博客 [blog.gitee.com](https://blog.gitee.com)
-3.  你可以 [https://gitee.com/explore](https://gitee.com/explore) 这个地址来了解 Gitee 上的优秀开源项目
-4.  [GVP](https://gitee.com/gvp) 全称是 Gitee 最有价值开源项目，是综合评定出的优秀开源项目
-5.  Gitee 官方提供的使用手册 [https://gitee.com/help](https://gitee.com/help)
-6.  Gitee 封面人物是一档用来展示 Gitee 会员风采的栏目 [https://gitee.com/gitee-stars/](https://gitee.com/gitee-stars/)
diff --git a/advanced-sql b/advanced-sql
new file mode 160000
index 0000000000000000000000000000000000000000..30887ad6cf06bbd5aaf0c641f256f68fd2ac9b2d
--- /dev/null
+++ b/advanced-sql
@@ -0,0 +1 @@
+Subproject commit 30887ad6cf06bbd5aaf0c641f256f68fd2ac9b2d