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@@ -0,0 +1,38 @@
+create database chr;
+use chr;
+--1使用sql语句创建班级信息表Class，字段如下
+create table Class (
+  ClassId int primary key identity(1,1),
+  ClassNmae nvarchar(50) 
+)
+--2使用sql语句创建学生信息表Student，字段如下：
+create table Student(
+  StudentId int primary key identity(1,1),
+  StudentName nvarchar(50) not null, 
+  StudentSex tinyint not null default 3 ,
+  StudentBirth date ,
+  StudentAddress nvarchar(255) not null,
+  ClassId int not null
+)
+--3使用sql语句创建课程信息表Course，字段如下：
+create table Course(
+  Courseld int primary key identity(1,1),
+  CourseName nvarchar(50) not null,
+  CourseCredit tinyint not null default 0 ,
+)
+--4使用sql语句创建班级课程表ClassCourse，字段如下：
+create table ClassCourse(
+  ClassCourseID int primary key identity(1,1),
+  ClassID int not null,
+  CourseID int not null
+)
+--5使用sql语句创建分数信息表Score，字段如下：
+create table Score(
+  ScoreId int primary key identity(1,1),
+  StudentId int not null,
+  Courseld int not null,
+  Score int not null
+)
+drop table Student;
+drop table ;
+