diff --git "a/20\347\216\213\344\270\226\350\264\242/\344\275\234\344\270\232/2022.9.15\344\275\234\344\270\232.sql" "b/20\347\216\213\344\270\226\350\264\242/\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/20\347\216\213\344\270\226\350\264\242/\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/20\347\216\213\344\270\226\350\264\242/\347\254\224\350\256\260/2022.9.15\347\254\224\350\256\260.md" "b/20\347\216\213\344\270\226\350\264\242/\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/20\347\216\213\344\270\226\350\264\242/\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/\351\223\276\346\216\245" "b/\351\223\276\346\216\245"
new file mode 100644
index 0000000000000000000000000000000000000000..9531489de623cde3db375e5693d4473418d5b8c2
--- /dev/null
+++ "b/\351\223\276\346\216\245"
@@ -0,0 +1 @@
+https://gitee.com/organizations/level-21-software-class-4/invite?invite=886e51af49d4c8e870217e863b9617a4db8ea8872269409fe67a7010cd42d36e1326d508fe5ad93be766b0d826817bc9
\ No newline at end of file