diff --git "a/\346\235\250\345\207\214\347\277\224 22/.keep" "b/\346\235\250\345\207\214\347\277\224 22/.keep"
new file mode 100644
index 0000000000000000000000000000000000000000..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391
diff --git "a/\346\235\250\345\207\214\347\277\224 22/\346\235\250\345\207\214\347\277\224 22/\344\275\234\344\270\232/student.sql" "b/\346\235\250\345\207\214\347\277\224 22/\346\235\250\345\207\214\347\277\224 22/\344\275\234\344\270\232/student.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..a8b86a88024d8e3bc04f645a0e5428eadac34e05
--- /dev/null
+++ "b/\346\235\250\345\207\214\347\277\224 22/\346\235\250\345\207\214\347\277\224 22/\344\275\234\344\270\232/student.sql"	
@@ -0,0 +1,54 @@
+CREATE DATABASE DBTEST
+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) NOT NULL UNIQUE,
+	userSex varchar(2) not null default('男') check(userSex='男' or userSex='女'),
+	userAge INT NOT NULL CHECK(userAge>=1 AND userAge<=100),
+	userAddress VARCHAR(50) DEFAULT('江西') NOT NULL,
+	userSection INT 
+ );
+ Alter table userInfo add constraint FK_StuInfo_ClassId foreign key(userSection) references sectionInfo(sectionID)
+ CREATE TABLE workInfo(
+	workId INT primary key identity(1,1),
+	userId  INT,
+	workTime DATETIME NOT NULL,
+	workDescription  varchar(40) CHECK(workDescription='迟到' OR workDescription='早退' OR workDescription='旷工'OR workDescription='病假'OR workDescription='事假')
+ );
+ Alter table workInfo add constraint FK_workInfo_ClassId foreign key(userId) references userInfo(userNo);
+ insert into sectionInfo VALUES('运行部');
+ INSERT INTO userInfo
+ (
+     userName,
+     userSex,
+     userAge,
+     userAddress,
+     userSection
+ )
+ VALUES
+ (   '张三', -- userName - varchar(10)
+     '男', -- userSex - varchar(2)
+     18,  -- userAge - int
+     '零零', -- userAddress - varchar(50)
+     2   -- userSection - int
+     );
+ INSERT INTO workInfo
+ (
+     userId,
+     workTime,
+     workDescription
+ )
+ VALUES
+ (   1,         -- userId - int
+     GETDATE(), -- workTime - datetime
+     '迟到'         -- workDescription - varchar(40)
+     )
+
+  SELECT * FROM sectionInfo;
+  SELECT * FROM userInfo;
+  SELECT * FROM workInfo;
+\ No newline at end of file
\ No newline at end of file
diff --git "a/\346\235\250\345\207\214\347\277\224 22/\346\235\250\345\207\214\347\277\224 22/\347\254\224\350\256\260/2020-9-16-\345\273\272\345\272\223\345\273\272\350\241\250.md" "b/\346\235\250\345\207\214\347\277\224 22/\346\235\250\345\207\214\347\277\224 22/\347\254\224\350\256\260/2020-9-16-\345\273\272\345\272\223\345\273\272\350\241\250.md"
new file mode 100644
index 0000000000000000000000000000000000000000..6afe816a8b450557cba194b44f72afb09848fae9
--- /dev/null
+++ "b/\346\235\250\345\207\214\347\277\224 22/\346\235\250\345\207\214\347\277\224 22/\347\254\224\350\256\260/2020-9-16-\345\273\272\345\272\223\345\273\272\350\241\250.md"	
@@ -0,0 +1,54 @@
+--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)