diff --git "a/\345\210\230\346\260\270\346\275\230/.keep" "b/\345\210\230\346\260\270\346\275\230/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\345\210\230\346\260\270\346\275\230/\344\275\234\344\270\232/.keep" "b/\345\210\230\346\260\270\346\275\230/\344\275\234\344\270\232/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\345\210\230\346\260\270\346\275\230/\344\275\234\344\270\232/2022-9-15\344\275\234\344\270\232.sql" "b/\345\210\230\346\260\270\346\275\230/\344\275\234\344\270\232/2022-9-15\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..fc08cd2629f36378e44ba6d569681b874774c8c4
--- /dev/null
+++ "b/\345\210\230\346\260\270\346\275\230/\344\275\234\344\270\232/2022-9-15\344\275\234\344\270\232.sql"
@@ -0,0 +1,43 @@
+CREATE DATABASE DBTEST;
+USE dbtest
+if exists (select * from sys.databases  where name='sectionInfo')
+drop table sectionInfo
+
+create table sectionInfo(
+	sectionID int primary key identity(1,1),
+	sectionName varchar(10) not null
+);
+
+create table userInfo(
+	userNo  int primary key identity(1,1) 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(0<userAge and userAge<100),
+	userAddress  varchar(50) default('湖北'),
+	userSection  int references sectionInfo(sectionID)
+);
+
+create table workInfo(
+	workId int primary key identity(1,1) 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 into sectionInfo values('行政部');
+insert into sectionInfo values('财务部');
+insert into sectionInfo values('人事部');
+insert into sectionInfo values('主管部');
+insert into sectionInfo values('技术部');
+
+insert into userInfo values('张三','男','30','湖南','1');
+insert into userInfo values('张四','女','90','福建','2');
+insert into userInfo values('张五','男','30','广西','3');
+insert into userInfo values('张六','女','20','广东','4');
+insert into userInfo values('张七','男','50','福建','5');
+
+insert into workInfo values(1,GETDATE(),'迟到');
+insert into workInfo values(2,GETDATE(),'早退');
+insert into workInfo values(3,GETDATE(),'旷工');
+insert into workInfo values(4,GETDATE(),'病假');
+insert into workInfo values(5,GETDATE(),'事假');
\ No newline at end of file
diff --git "a/\345\210\230\346\260\270\346\275\230/\347\254\224\350\256\260/.keep" "b/\345\210\230\346\260\270\346\275\230/\347\254\224\350\256\260/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\345\210\230\346\260\270\346\275\230/\347\254\224\350\256\260/2022-9-15\347\254\224\350\256\260.txt" "b/\345\210\230\346\260\270\346\275\230/\347\254\224\350\256\260/2022-9-15\347\254\224\350\256\260.txt"
new file mode 100644
index 0000000000000000000000000000000000000000..0bf2cf1ef519b2d20d5a3df3d9da3d455d2677e5
--- /dev/null
+++ "b/\345\210\230\346\260\270\346\275\230/\347\254\224\350\256\260/2022-9-15\347\254\224\350\256\260.txt"
@@ -0,0 +1,79 @@
+--关系型数据库:SQL server, Mysql, Oracle 
+
+--database:数据库
+
+if exists (select * from sys.databases where name='DBTEST')
+--创建数据库：create database 数据库drop（删除数据库）create（创建）
+ 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;
+
+ --字符串：char(5),varchar(5),nvarchar(5)之间区别是什么
+
+
+
+ --删除表:drop table 表名
+ drop table StuInfo
+
+
+ --非空
+
+ --约束，自增(标识列)
+
+ --外键
+ --主键：默认唯一列
+ --默认
+ --唯一：
+ --check检查:
+
+ --插入数据：insert into
\ No newline at end of file