数据库课程设计——学生信息管理系统（Sqlserver，C#，Winform）

目录

需求分析

一.登录功能

二.注册功能

三.管理员登录后跳转到功能页面：

四.学生信息管理（主界面，删除功能在主界面代码中）

五.学生信息添加和修改（设计在一个页面上，修改需要选中行）

六.课程信息管理（删除功能在主界面中）

 七.课程信息添加和修改

 八.成绩信息管理（删除功能在主界面代码中）

九.成绩信息添加和修改

十.数据库设计

https://github.com/2736933896/StudentSystem，报告，项目源码，数据库设计，窗体设计源码上传到github，需要的同学自行下载哦

需求分析

1.1设计可视化界面，具有身份验证功能，需要登录时输入账号及密码。

1.2学生用户能够注册自己的账号，添加自己的基本注册信息：学号、密码、姓名、性别，对于学生除了基本注册信息外，还包括学生个人信息、课程信息、学生成绩信息。

1.3学生信息、课程信息、学生成绩都能实现增删改查并且符合符合数据库完整性。

（其他图文内容省略了，需要课程报告的私聊我）

一.登录功能

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using static System.Windows.Forms.VisualStyles.VisualStyleElement.StartPanel;

namespace StudentSY

{

public partial class Form1 : Form

{

public Form1()

{

InitializeComponent();

}

private void timer3_Tick(object sender, EventArgs e)

{

if(pictureBox2.Location.X<200)

{

pictureBox2.Location = new Point(pictureBox2.Location.X + 2, pictureBox2.Location.Y);

}

else

{

if(comboBox1.Text=="学生")

{

Form4 form4 = new Form4();

form4.Show();

}

timer3.Stop();

}

}

private void button3_Click(object sender, EventArgs e)

{

if(login())

{

timer3.Start();

textBox3.Visible = false;

textBox4.Visible = false;

comboBox1.Visible = false;

button3.Visible = false;

button4.Visible = false;

button5.Visible = false;

label4.Visible = false;

label5.Visible = false;

label6.Visible = false;

}

}

private bool login()

{

if(textBox3.Text==null|| textBox4.Text==null)

{

MessageBox.Show("登录失败，账号或者密码为空","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);

return false;

}

else if (comboBox1.Text == "学生")

{

string sql = "select * from StudentUser where ID='" + textBox3.Text + "'and PassWord='" + textBox4.Text + "'";

Dao dao = new Dao();

IDataReader dr = dao.read(sql);

if(dr.Read())

{

return true;

}

else

{

MessageBox.Show("登录失败！账号或者密码错误，请重试");

return false;

}

}

return false;

}

private void button4_Click(object sender, EventArgs e)

{

textBox3.Text = null;

textBox4.Text = null;

comboBox1.Text = null;

}

private void button5_Click(object sender, EventArgs e)

{

Form11 form11 = new Form11();

form11.ShowDialog();

}

private void Form1_Load(object sender, EventArgs e)

{

}

private void label7_Click(object sender, EventArgs e)

{

}

}

}

二.注册功能

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace StudentSY

{

public partial class Form11 : Form

{

public Form11()

{

InitializeComponent();

}

private void button1_Click(object sender, EventArgs e)

{

if(textBox1.Text==""|| textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "" )

{

MessageBox.Show("输入不完整，有空项，请检查！","提示",MessageBoxButtons.OK,MessageBoxIcon.Warning);

}

else

{

string sql= "insert into StudentUser values('" + textBox1.Text + "', '" + textBox2.Text + "', '" + textBox3.Text + "', '" + textBox4.Text + "')";

Dao dao = new Dao();

int i = dao.Excute(sql);

if(i>0)

{

MessageBox.Show("添加成功");

this.Close();

}

}

}

private void button2_Click(object sender, EventArgs e)

{

textBox1.Text = null;

textBox2.Text = null;

textBox3.Text = null;

textBox4.Text = null;

}

}

}

三.管理员登录后跳转到功能页面：

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace StudentSY

{

public partial class Form4 : Form

{

public Form4()

{

InitializeComponent();

toolStripStatusLabel3.Text = DateTime.Now.ToString("G");

timer1.Start();

}

private void timer1_Tick(object sender, EventArgs e)

{

toolStripStatusLabel3.Text = DateTime.Now.ToString("G");

}

private void button1_Click(object sender, EventArgs e)

{

Form2 form2 = new Form2();

form2.ShowDialog();

}

private void button2_Click(object sender, EventArgs e)

{

Form3 form3 = new Form3();

form3.ShowDialog();

}

private void button3_Click(object sender, EventArgs e)

{

Form31 form31 = new Form31();

form31.ShowDialog();

}

private void button4_Click(object sender, EventArgs e)

{

Application.Exit();

}

}

}

四.学生信息管理（主界面，删除功能在主界面代码中）

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace StudentSY

{

public partial class Form2 : Form

{

public Form2()

{

InitializeComponent();

toolStripStatusLabel3.Text = DateTime.Now.ToString("G");

timer1.Start();

Table();

}

private void timer1_Tick(object sender, EventArgs e)

{

toolStripStatusLabel3.Text = DateTime.Now.ToString("G");

}

public void Table() //读取数据

{

string sql = "select * from Student";

Dao dao = new Dao();

IDataReader dr = dao.read(sql);

while(dr.Read())

{

string Sno;

string Sname;

string Ssex, Sage, Sdept;

Sno = dr["Sno"].ToString();

Sname = dr["Sname"].ToString();

Ssex = dr["Ssex"].ToString();

Sage = dr["Sage"].ToString();

Sdept = dr["Sdept"].ToString();

string[] str = { Sno, Sname, Ssex, Sage, Sdept };

dataGridView1.Rows.Add(str);

}

dr.Close();

}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

dataGridView1.Rows[e.RowIndex].DefaultCellStyle.ForeColor = Color.Black;

}

private void dataGridView1_RowDefaultCellStyleChanged(object sender, DataGridViewRowEventArgs e)

{

ForeColor = Color.Black;

}

private void 添加学生ToolStripMenuItem_Click(object sender, EventArgs e)

{

Form21 form21 = new Form21();

form21.ShowDialog(); //开一个新窗口;

dataGridView1.Rows.Clear();

Table();

}

private void 修改学生信息ToolStripMenuItem_Click(object sender, EventArgs e)

{

try

{

string[] str = { dataGridView1.SelectedCells[0].Value.ToString(), dataGridView1.SelectedCells[1].Value.ToString(),

dataGridView1.SelectedCells[2].Value.ToString(),dataGridView1.SelectedCells[3].Value.ToString(),

dataGridView1.SelectedCells[4].Value.ToString()};

// MessageBox.Show(str[0]+str[1]+str[2]+str[3]+str[4]);

Form21 form21 = new Form21(str);

form21.ShowDialog();

dataGridView1.Rows.Clear();

Table();

}

catch

{

MessageBox.Show("未正确选中行，请重试");

}

}

private void 删除学生信息ToolStripMenuItem_Click(object sender, EventArgs e)

{

DialogResult r = MessageBox.Show("确定要删除吗？", "提示", MessageBoxButtons.OKCancel);

if(r==DialogResult.OK)

{

try

{

string id, name;

id = dataGridView1.SelectedCells[0].Value.ToString(); //选中当前行第一列的值

name = dataGridView1.SelectedCells[0].Value.ToString();

string sql = "delete from Student where Sno=" + id;

Dao dao = new Dao();

int i = dao.Excute(sql); //执行SQL语句

if(i>0)

{

dataGridView1.Rows.Clear();

Table();

}

}

catch

{

MessageBox.Show("请正确选择行");

}

}

}

private void toolStripButton4_Click(object sender, EventArgs e)

{

dataGridView1.Rows.Clear();

Table();

}

private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)

{

Application.Exit();

}

private void toolStripButton1_Click(object sender, EventArgs e)

{

添加学生ToolStripMenuItem_Click(sender, e);

}

private void toolStripButton3_Click(object sender, EventArgs e)

{

删除学生信息ToolStripMenuItem_Click(sender, e);

}

private void toolStripButton2_Click(object sender, EventArgs e)

{

修改学生信息ToolStripMenuItem_Click(sender, e);

; }

}

}

五.学生信息添加和修改（设计在一个页面上，修改需要选中行）

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace StudentSY

{

public partial class Form21 : Form

{

string []str = new string[5];

public Form21()

{

InitializeComponent();

button1.Text = "添加信息"; //更改button的值，用于增加和修改信息

}

public Form21(string[] a)

{

InitializeComponent();

button1.Text = "修改信息";

for(int i =0;i<5;i++)

{

str[i] = a[i];

}

textBox1.Text = str[0];

textBox2.Text = str[1];

textBox3.Text = str[2];

textBox4.Text = str[3];

textBox5.Text = str[4];

// this.Close();

}

private void Form21_Load(object sender, EventArgs e)

{

}

private void button1_Click(object sender, EventArgs e)

{

if (button1.Text == "添加信息")

{

if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "" || textBox5.Text == "")

{

MessageBox.Show("输入不完整，不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);

}

else

{

string sql = "insert into Student Values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "','" + textBox5.Text + "')";

MessageBox.Show(sql);

Dao dao = new Dao();

int i = dao.Excute(sql);

if (i > 0)

{

MessageBox.Show("添加成功");

this.Close();

}

}

}

else if (button1.Text == "修改信息")

{

if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "" || textBox4.Text == "" || textBox5.Text == "")

{

MessageBox.Show("修改后有空项,请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);

}

else

{

string sql = "update Student set Sno='"+textBox1.Text+"' ,Sname ='"+textBox2.Text+"',Ssex='"+textBox3.Text+"',Sage='"+textBox4.Text+"',Sdept='"+textBox5.Text+"' where Sno = '" + str[0] +"';";

Dao dao = new Dao();

int i = dao.Excute(sql);

if (i > 0)

{

MessageBox.Show("修改成功");

this.Close();

}

}

}

}

private void button2_Click(object sender, EventArgs e)

{

this.Close();

}

}

}

六.课程信息管理（删除功能在主界面中）

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace StudentSY

{

public partial class Form3 : Form

{

public Form3()

{

InitializeComponent();

toolStripStatusLabel3.Text = DateTime.Now.ToString("G");

timer1.Start();

Table();

}

public void Table()

{

string sql = "select * from Course";

Dao dao = new Dao();

IDataReader dr = dao.read(sql);

while (dr.Read())

{

string Cno, Cname, Cpno, Credit;

Cno = dr["Cno"].ToString();

Cname = dr["Cname"].ToString();

Cpno = dr["Cpno"].ToString();

Credit = dr["Credit"].ToString();

string[] str = { Cno, Cname, Cpno, Credit };

dataGridView1.Rows.Add(str);

}

dr.Close();

}

private void timer1_Tick(object sender, EventArgs e)

{

toolStripStatusLabel3.Text = DateTime.Now.ToString("G");

}

private void 添加课程ToolStripMenuItem_Click(object sender, EventArgs e)

{

addcourse addcourse = new addcourse();

addcourse.ShowDialog();

dataGridView1.Rows.Clear();

Table();

}

private void 修改课程ToolStripMenuItem_Click(object sender, EventArgs e)

{

try

{

string[] str = { dataGridView1.SelectedCells[0].Value.ToString(), dataGridView1.SelectedCells[1].Value.ToString(),

dataGridView1.SelectedCells[2].Value.ToString(),dataGridView1.SelectedCells[3].Value.ToString()};

addcourse addcourse = new addcourse(str);

addcourse.ShowDialog();

dataGridView1.Rows.Clear();

Table();

}

catch

{

MessageBox.Show("未正确选择行，请重试");

}

}

private void toolStripButton4_Click(object sender, EventArgs e)

{

dataGridView1.Rows.Clear();

Table();

}

private void 删除课程ToolStripMenuItem_Click(object sender, EventArgs e)

{

DialogResult r = MessageBox.Show("确定要删除吗？", "提示", MessageBoxButtons.OKCancel);

if (r == DialogResult.OK)

{

try

{

string id;

id = dataGridView1.SelectedCells[0].Value.ToString(); //选中当前行第一列的值

// name = dataGridView1.SelectedCells[0].Value.ToString();

string sql = "delete from Course where Cno=" + id;

Dao dao = new Dao();

int i = dao.Excute(sql); //执行SQL语句

if (i > 0)

{

dataGridView1.Rows.Clear();

Table();

}

}

catch

{

MessageBox.Show("请正确选择行");

}

}

}

private void toolStripButton1_Click(object sender, EventArgs e)

{

添加课程ToolStripMenuItem_Click(sender, e);

}

private void toolStripButton2_Click(object sender, EventArgs e)

{

修改课程ToolStripMenuItem_Click(sender, e);

}

private void toolStripButton3_Click(object sender, EventArgs e)

{

删除课程ToolStripMenuItem_Click(sender, e);

}

private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)

{

Application.Exit();

}

private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)

{

}

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

}

}

}

 七.课程信息添加和修改

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace StudentSY

{

public partial class addcourse : Form

{

string[] str=new string[4];

public addcourse()

{

InitializeComponent();

button1.Text = "添加信息";

}

public addcourse(string[] a)

{

InitializeComponent();

button1.Text = "修改信息";

for (int i = 0; i < 4; i++)

{

str[i] = a[i];

}

textBox1.Text = str[0];

textBox2.Text = str[1];

textBox3.Text = str[2];

textBox4.Text = str[3];

// this.Close();

}

private void button1_Click(object sender, EventArgs e)

{

if (button1.Text == "添加信息")

{

if (textBox1.Text == "" || textBox2.Text == "" || textBox4.Text == "")

{

MessageBox.Show("除先修课外输入不完整，不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);

}

else

{

string sql = "insert into Course Values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "','" + textBox4.Text + "')";

MessageBox.Show(sql);

Dao dao = new Dao();

int i = dao.Excute(sql);

if (i > 0)

{

MessageBox.Show("添加成功");

this.Close();

}

}

}

else if (button1.Text == "修改信息")

{

if (textBox1.Text == "" || textBox2.Text == "" || textBox4.Text == "" )

{

MessageBox.Show("除先修课外修改后有空项,请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);

}

else

{

string sql = "update Course set Cno='" + textBox1.Text + "' ,Cname ='" + textBox2.Text + "',Cpno='" + textBox3.Text + "',Credit='" + textBox4.Text + "' where Cno = '" + str[0] + "';";

Dao dao = new Dao();

int i = dao.Excute(sql);

if (i > 0)

{

MessageBox.Show("修改成功");

this.Close();

}

}

}

}

private void button2_Click(object sender, EventArgs e)

{

this.Close();

}

}

}

 八.成绩信息管理（删除功能在主界面代码中）

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

namespace StudentSY

{

public partial class Form31 : Form

{

public Form31()

{

InitializeComponent();

Table();

}

public void Table()

{

string sql = "select * from SC";

Dao dao = new Dao();

IDataReader dr = dao.read(sql);

while (dr.Read())

{

string Sno,Cno,Grade;

Sno = dr["Sno"].ToString();

Cno = dr["Cno"].ToString();

Grade = dr["Grade"].ToString();

string[] str = { Sno,Cno, Grade};

dataGridView2.Rows.Add(str);

}

dr.Close();

}

private void 添加成绩ToolStripMenuItem_Click(object sender, EventArgs e)

{

addgrade addgrade = new addgrade();

addgrade.ShowDialog();

dataGridView2.Rows.Clear();

Table();

}

private void 删除成绩ToolStripMenuItem_Click(object sender, EventArgs e)

{

DialogResult r = MessageBox.Show("确定要删除吗？", "提示", MessageBoxButtons.OKCancel);

if (r == DialogResult.OK)

{

try

{

string sno,cno;

sno = dataGridView2.SelectedCells[0].Value.ToString(); //选中当前行第一列的值

cno= dataGridView2.SelectedCells[1].Value.ToString(); // name = dataGridView1.SelectedCells[0].Value.ToString();

string sql = "delete from SC where Sno= '"+sno+"' and Cno='"+cno+"'";

Dao dao = new Dao();

int i = dao.Excute(sql); //执行SQL语句

if (i > 0)

{

dataGridView2.Rows.Clear();

Table();

}

}

catch

{

MessageBox.Show("请正确选择行");

}

}

}

private void 修改成绩ToolStripMenuItem_Click(object sender, EventArgs e)

{

try

{

string[] str = { dataGridView2.SelectedCells[0].Value.ToString(), dataGridView2.SelectedCells[1].Value.ToString(),

dataGridView2.SelectedCells[2].Value.ToString()};

addgrade addgrade = new addgrade(str);

addgrade.ShowDialog();

dataGridView2.Rows.Clear();

Table();

}

catch

{

MessageBox.Show("未正确选择行，请重试");

}

}

private void toolStripButton1_Click(object sender, EventArgs e)

{

添加成绩ToolStripMenuItem_Click(sender, e);

}

private void toolStripButton2_Click(object sender, EventArgs e)

{

修改成绩ToolStripMenuItem_Click(sender, e);

}

private void toolStripButton3_Click(object sender, EventArgs e)

{

删除成绩ToolStripMenuItem_Click(sender, e);

}

private void toolStripButton4_Click(object sender, EventArgs e)

{

dataGridView2.Rows.Clear();

Table();

}

private void dataGridView2_CellContentClick(object sender, DataGridViewCellEventArgs e)

{

}

private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)

{

Application.Exit();

}

}

}

九.成绩信息添加和修改

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Data;

using System.Drawing;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using System.Windows.Forms;

using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace StudentSY

{

public partial class addgrade : Form

{

string []str = new string[3];

public addgrade()

{

InitializeComponent();

button1.Text = "添加信息";

}

public addgrade(string[] a)

{

InitializeComponent();

button1.Text = "修改信息";

for (int i = 0; i < 3; i++)

{

str[i] = a[i];

}

textBox1.Text = str[0];

textBox2.Text = str[1];

textBox3.Text = str[2];

}

private void textBox2_TextChanged(object sender, EventArgs e)

{

}

private void button1_Click(object sender, EventArgs e)

{

if (button1.Text == "添加信息")

{

if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "")

{

MessageBox.Show("输入不完整，不能为空", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);

}

else

{

string sql = "insert into SC Values('" + textBox1.Text + "','" + textBox2.Text + "','" + textBox3.Text + "')";

MessageBox.Show(sql);

Dao dao = new Dao();

int i = dao.Excute(sql);

if (i > 0)

{

MessageBox.Show("添加成功");

this.Close();

}

}

}

else if (button1.Text == "修改信息")

{

if (textBox1.Text == "" || textBox2.Text == "" || textBox3.Text == "")

{

MessageBox.Show("修改后有空项,请检查", "提示", MessageBoxButtons.OK, MessageBoxIcon.Warning);

}

else

{

string sql = "update SC set Grade='" + textBox3.Text + "' where Sno = '" + str[0] + "' and Cno ='" + str[1] +"';";

Dao dao = new Dao();

int i = dao.Excute(sql);

if (i > 0)

{

MessageBox.Show("修改成功");

this.Close();

}

}

}

}

private void button2_Click(object sender, EventArgs e)

{

this.Close();

}

}

}

十.数据库设计

USE MySchool;

DROP TABLE IF EXISTS SC /*成绩*/

DROP TABLE IF EXISTS Student /*学生信息*/

DROP TABLE IF EXISTS Course /*课程*/

DROP TABLE IF EXISTS StudentUser /*学生用户信息*/

DROP TABLE IF EXISTS Administrator /*管理员用户信息*/

DROP TABLE IF EXISTS SysLog /*注册日志*/

DROP TABLE IF EXISTS SysLog1 /*登陆日志*/

DROP TABLE IF EXISTS AVG1 /*平均成绩*/

Create table StudentUser --学生注册信息表格

(ID nchar(20) primary key,

PassWord nchar(32),

Name nchar(20),

Sex nchar(2),

);

Create table Administrator --管理员注册信息表格

(

ID char(20) primary key,

PassWord nchar(32),

Name nchar(20),

Sex char(2),

-- Birthday datetime ,

--UserMobile nchar(11),

);

Create table Student --学生信息表格

(

Sno char(9) primary key, --列级完整性约束条件,Sno是主码

Sname char(20) Unique, --名字唯一

Ssex char(2),

Sage int,

Sdept char(20),

);

Create table Course

(

Cno char(9) primary key, --列级完整性约束条件,Cno是主码

Cname char(40),

cpno char(4),

Credit int,

);

create table SC

(

Sno char(9),

Cno char(9),

Grade int,

primary key (Sno,Cno), --主码由两个属性构成，必须作为表级完整性进行定义

foreign key (Sno) references Student(Sno), --表级完整性约束条件，Sno是外码，被参照表是Student

foreign key (Cno) references Course(Cno) --表级完整性约束条件， Cno是外码，被参照表是Course

);

INSERT INTO StudentUser VALUES ('2023123','123456','张三','男');

INSERT INTO Administrator VALUES ('2023124','123456','张三','男');

INSERT INTO Administrator VALUES ('2023125','123456','张三','男');

INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215121','李勇','男','CS',20);

INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215122','刘晨','女','CS',19);

INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215123','王敏','女','MA',18);

INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215125','张立','男','IS',19);

INSERT INTO Student (Sno,Sname,Ssex,Sdept,Sage) VALUES ('201215128','陈冬','男','IS',20);

SELECT * FROM Student

INSERT INTO Course(Cno,Cname,Cpno,Credit) VALUES ('1','数据库',NULL,4);

INSERT INTO Course(Cno,Cname,Cpno,Credit) VALUES ('2','数学',NULL,4);

INSERT INTO Course(Cno,Cname,Cpno,Credit) VALUES ('3','信息系统',NULL,4);

INSERT INTO Course(Cno,Cname,Cpno,Credit) VALUES ('4','操作系统',NULL,4);

INSERT INTO Course(Cno,Cname,Cpno,Credit) VALUES ('5','数据结构',NULL,4);

INSERT INTO Course(Cno,Cname,Cpno,Credit) VALUES ('6','数据处理',NULL,4);

INSERT INTO Course(Cno,Cname,Cpno,Credit) VALUES ('7','Pascal语言',NULL,4);

UPDATE Course SET Cpno = '5' WHERE Cno = '1'

UPDATE Course SET Cpno = '1' WHERE Cno = '3'

UPDATE Course SET Cpno = '6' WHERE Cno = '4'

UPDATE Course SET Cpno = '7' WHERE Cno = '5'

UPDATE Course SET Cpno = '6' WHERE Cno = '7'

SELECT * FROM Course

INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','1',92);

INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','2',85);

INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215121 ','3',88);

INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215122 ','2',90);

INSERT INTO SC(Sno,Cno,Grade) VALUES ('201215122 ','3',80);

SELECT * FROM SC

CREATE TABLE AVG1

(

Cname CHAR(10), /* 科目*/

avg1 INT

);

INSERT INTO AVG1(Cname,avg1) VALUES ('数据库',NULL);

INSERT INTO AVG1(Cname,avg1) VALUES ('数学',NULL);

INSERT INTO AVG1(Cname,avg1) VALUES ('信息系统',NULL);

INSERT INTO AVG1(Cname,avg1) VALUES ('操作系统',NULL);

INSERT INTO AVG1(Cname,avg1) VALUES ('数据结构',NULL);

INSERT INTO AVG1(Cname,avg1) VALUES ('数据处理',NULL);

INSERT INTO AVG1(Cname,avg1) VALUES ('Pascal语言',NULL);

学生信息表（Student）:

课程表（Course）：

成绩表（SC）：

学生用户表（StudentUser）：

 有需要完整代码和实验报告的同学私聊我，有什么问题评论

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