diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/.keep" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\344\275\234\344\270\232/.keep" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\344\275\234\344\270\232/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\344\275\234\344\270\232/2022.9.15\344\275\234\344\270\232.sql" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\344\275\234\344\270\232/2022.9.15\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..e112875f6bb91ebce91b4dbcfdc5c26227116840
--- /dev/null
+++ "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\344\275\234\344\270\232/2022.9.15\344\275\234\344\270\232.sql"
@@ -0,0 +1,71 @@
+--创建数据库 DBTEST
+if exists (select * from sys.databases where name =  'DBTEST')
+drop database DBTEST
+create database DBTEST;
+
+
+--部门信息表（sectionInfo）
+--	部门编号  sectionID  int 标识列  主键
+--	部门名称  sectionName  varchar(10)  不能为空
+
+create table sectionInfo(
+	sectionID int primary  key identity(1,1),
+	sectionName varchar(10) not null
+)
+
+insert sectionInfo values('研发');
+insert sectionInfo values('生产');
+insert sectionInfo values('财务');
+insert sectionInfo values('人事');
+insert sectionInfo values('计划');
+
+-- select * from sectionInfo;
+
+--员工信息表（userInfo）
+--	员工编号  userNo  int  标识列 主键  不允许为空
+--	员工姓名  userName  varchar(10)  唯一约束 不允许为空 长度必须大于4
+--	员工性别  userSex   varchar(2)  不允许为空  只能是男或女
+--	员工年龄  userAge   int  不能为空  范围在1-100之间
+--	员工地址  userAddress  varchar(50)  默认值为“湖北”
+--	员工部门  userSection  int  外键，引用部门信息表的部门编号
+
+--drop table userInfo;
+
+create table userInfo (
+	userNo int identity(1,1) primary key not null,
+	userName varchar(10) unique not null check(len(userName) > 4),
+	userSex varchar(2) not null check(userSex = '男' or userSex = '女') ,
+	userAge int not null check(userAge between 1 and 100),
+	userAddress varchar(50) default '湖北',
+	userSection int references sectionInfo(sectionId)
+);
+
+insert userInfo (userName,userSex,userAge,userAddress,userSection)
+values ('张三123','男','25','福建','1'),
+		('李四123','女','30','上海','2'),
+		('王五123','女','36','上海','3'),
+		('赵六123','女','40','广州','4'),
+		('11223','女','27','广州','5');
+--select * from userInfo
+
+--员工考勤表（workInfo）
+--	考勤编号  workId int 标识列  主键  不能为空
+--	考勤员工  userId  int 外键 引用员工信息表的员工编号 不能为空
+--	考勤时间  workTime datetime 不能为空
+--	考勤说明  workDescription  varchar(40) 不能为空 内容只能是“迟到”，“早退”，“旷工”，“病假”，“事假”中的一种
+
+create table workInfo(
+	workId int identity(1,1) primary key not null,
+	userId int references userInfo(userNo) not null,
+	workTime datetime not null,
+	workDescription varchar(40) not null check(workDescription = '迟到' or workDescription = '早退' or workDescription = '旷工' or workDescription = '病假' or  workDescription = '事假')
+)
+insert workInfo(userId,workTime,workDescription) 
+values (1,'2022-1-15 15:15:1','迟到'),
+		(2,'2022-1-16 15:15:1','早退'),
+		(3,'2022-1-14 15:15:1','旷工'),
+		(4,'2022-1-16 15:15:1','病假'),
+		(5,'2022-1-12 15:15:1','事假');
+
+
+--select * from workInfo
\ No newline at end of file
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\347\254\224\350\256\260/.keep" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\347\254\224\350\256\260/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\347\254\224\350\256\260/2022.9.15\347\254\224\350\256\260.md" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\347\254\224\350\256\260/2022.9.15\347\254\224\350\256\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..1d4f017fa879ef9163b7d6049805bde06c96c12d
--- /dev/null
+++ "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\270\200\357\274\211/\347\254\224\350\256\260/2022.9.15\347\254\224\350\256\260.md"
@@ -0,0 +1,53 @@
+# 1.绾︽潫
+
+- 涓婚敭绾︽潫  primary key
+
+    ```sql
+    create table a(
+    	id int primary key identity(1,1)
+    )
+    ```
+
+    ```sql
+    alter table 琛ㄥ悕 alter column 涓婚敭鍒楀悕 涓婚敭绫诲瀷 not null;
+    ```
+
+    
+
+- 澶栭敭绾︽潫  foreig key  references
+
+```sql
+ --淇敼琛ㄧ粨鏋� 琛ㄥ悕 add constraint 绾︽潫鍚� foreign key(瑕佸紩鐢ㄧ殑瀛楁) references 涓婚敭琛�(瀛楁)
+ Alter table StuInfo add constraint FK_StuInfo_ClassId foreign key(ClassID) references ClassInfo(ClassID)
+```
+
+```sql
+ClassID int references ClassInfo(ClassID)
+ ClassID int
+```
+
+- 榛樿   default
+
+    ```sql
+    userAddress varchar(50) default '婀栧寳'
+    ```
+
+- 鍞竴  unique
+
+    ```sql
+    userName varchar(10) unique
+    ```
+
+- check
+
+- 濡傛灉瀵瑰崟涓垪瀹氫箟 CHECK 绾︽潫锛岄偅涔堣鍒楀彧鍏佽鐗瑰畾鐨勫�笺��
+
+    濡傛灉瀵逛竴涓〃瀹氫箟 CHECK 绾︽潫锛岄偅涔堟绾︽潫浼氬熀浜庤涓叾浠栧垪鐨勫�煎湪鐗瑰畾鐨勫垪涓鍊艰繘琛岄檺鍒躲��
+
+    ```sql
+    userAge int not null check(userAge between 1 and 100)
+    ```
+
+    
+
+- 闈炵┖  not null
\ No newline at end of file
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/.keep" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/2022.9.16\344\275\234\344\270\232.sql" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/2022.9.16\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..ebf1aee7770fc08980360baa000a4dc69ad64bbc
--- /dev/null
+++ "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/2022.9.16\344\275\234\344\270\232.sql"
@@ -0,0 +1,81 @@
+--查询出巨蟹 6.22--7.22 的员工信息
+select * from People
+where datename(month,PeopleBirth) = 6 and day(PeopleBirth) between 22 and 30
+or datename(month,PeopleBirth) = 7 and day(PeopleBirth) between 1 and 22;
+
+
+--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 '猴'
+when year(PeopleBirth)%12 = 1
+then '鸡'
+when year(PeopleBirth)%12 = 2
+then '狗'
+when year(PeopleBirth)%12 = 3
+then '猪'
+when year(PeopleBirth)%12 = 4
+then '鼠'
+when year(PeopleBirth)%12 = 5
+then '牛'
+when year(PeopleBirth)%12 = 6
+then '虎'
+when year(PeopleBirth)%12 = 7
+then '兔'
+when year(PeopleBirth)%12 = 8
+then '龙'
+when year(PeopleBirth)%12 = 9
+then '蛇'
+when year(PeopleBirth)%12 = 10
+then '马'
+when year(PeopleBirth)%12 = 11
+then '羊'
+end '生肖'
+from People 
+
+
+--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 p.*,d.DepartmentName from People p
+inner join Department d 
+on p.DepartmentId = d.DepartmentId
+where p.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 p.*,d.DepartmentName,r.RankName from People p
+inner join Department d 
+on p.DepartmentId = d.DepartmentId
+inner join Rank r on r.RankId = p.RankId
+where p.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 count(D.DepartmentName)部门员工人数,sum(p.PeopleSalary)员工工资总和,convert(decimal(10,2),
+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 count(D.DepartmentName)部门员工人数,sum(p.PeopleSalary)员工工资总和,convert(decimal(10,2),
+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 平均工资 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(*)员工人数,
+sum(p.PeopleSalary)员工工资总和,convert(decimal(10,2),
+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
+inner join Rank r on r.RankId = p.RankId
+group by d.DepartmentName,r.RankName
\ No newline at end of file
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/\344\275\234\344\270\232/.keep" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/\344\275\234\344\270\232/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/\347\254\224\350\256\260/.keep" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/\347\254\224\350\256\260/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/\347\254\224\350\256\260/2022.9.16\347\254\224\350\256\260.md" "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/\347\254\224\350\256\260/2022.9.16\347\254\224\350\256\260.md"
new file mode 100644
index 0000000000000000000000000000000000000000..1e7e72891899843b8ed78de6eb7eb342d5f947a7
--- /dev/null
+++ "b/\346\210\264\344\277\212\351\224\213\357\274\210\344\272\214\357\274\211/\347\254\224\350\256\260/2022.9.16\347\254\224\350\256\260.md"
@@ -0,0 +1,45 @@
+# 1.妯＄硦鏌ヨ
+
+```sql
+[]锛氫唬琛ㄥ尮閰嶈寖鍥村唴
+[^]锛氫唬琛ㄥ尮閰嶄笉鍦ㄨ寖鍥村唴
+```
+
+```sql
+select * from Department where DepartmentId like   '[1-3]'
+
+// [1-3] == 1,2,3
+
+select * from Department where DepartmentId like   '[^1-3]'
+
+//[^1-3] == 4
+```
+
+# 2.CONVERT()涓嶤AST()鍑芥暟:
+
+```sql
+
+convert(decimal(13,2),12.45454)
+cast(12.45454 as decimal(13,2))
+```
+
+# 3.鏃堕棿鍑芥暟
+
+```sql
+select DATEDIFF(day, '2019-08-20', getDate());    --鑾峰彇鎸囧畾鏃堕棿鍗曚綅鐨勫樊鍊�
+SELECT DATEADD(MINUTE,-5,GETDATE())               --鍔犲噺鏃堕棿,姝ゅ涓鸿幏鍙栦簲鍒嗛挓鍓嶇殑鏃堕棿,MINUTE 琛ㄧず鍒嗛挓锛屽彲涓� YEAR,MONTH,DAY,HOUR
+select DATENAME(month, getDate());                --褰撳墠鏈堜唤
+select DATENAME(WEEKDAY, getDate());              --褰撳墠鏄熸湡鍑�
+select DATEPART(month, getDate());                --褰撳墠鏈堜唤
+select DAY(getDate());                            --杩斿洖褰撳墠鏃ユ湡澶╂暟
+select MONTH(getDate());                          --杩斿洖褰撳墠鏃ユ湡鏈堟暟
+select YEAR(getDate());                           --杩斿洖褰撳墠鏃ユ湡骞存暟
+
+SELECT CONVERT(VARCHAR(22),GETDATE(),20)          --2020-01-09 14:46:46
+SELECT CONVERT(VARCHAR(24),GETDATE(),21)          --2020-01-09 14:46:55.91
+SELECT CONVERT(VARCHAR(22),GETDATE(),23)		  --2020-01-09
+SELECT CONVERT(VARCHAR(22),GETDATE(),24)          --15:04:07
+Select CONVERT(varchar(20),GETDATE(),14)          --15:05:49:330
+```
+
+# 
\ No newline at end of file