可以直接从我的GitHub中获取文档：
学生选课系统GitHub
一 题目
学生选课系统
二 需求分析
1.根据学生专业学年学期等信息，录入课程完成课程计划
2.根据课程计划，录入任课教师信息
3.学生可以根据学年学期等信息，选择课程完成选课要求
三 结构概念设计
计划受众表信息
学生表信息
教师表信息
课程表信息
教学计划表信息
任课表信息
学生选课表信息
四 ER图（基于三级范式）
这里我遇到一个问题如何设计ER图 和如何根据ER图设计关系逻辑呢？
数据库设计方法
看了以上这篇 收益很多 可以参考下
五 数据字典
Stdunt表（学生表）
字段名 数据类型 长度 约束 描述
字段名 数据类型 长度 约束 描述
Student_id Nvar char 50 主键 学生学号
Gender Nvarchar 50 无 性别
Name Nvarchar 50 无 学生名字
category Nvarchar 50 无 种类Course表（课程表）
字段名 数据类型 长度 约束 描述
course_id Nvarchar 50 主键 课程号
Name Nvarchar 50 唯一键 课程名
mode Nvarchar 50 无 考核方式
Credit Int 无 学分each表（教师任课表）
字段名 数据类型 长度 约束 描述
Teach_id Nvarchar 50 主键 任课号
Plan_id Nvarchar 50 外键，组合唯一键 教学计划号
Teacher_id Nvarchar 50 外键，组合唯一键 教师编号Teacher表（教师表）
字段名 数据类型 长度 约束 描述
Teacher_id Nvarchar 50 主键 教师编号
Name Nvarchar 50 无 教师名
Gender Nvarchar 50 无 性别
Student_select表（学生选课表）
字段名 数据类型 长度 约束 描述
Select_id Nvarchar 50 主键 选课号
Student_id Nvarchar 50 外键，组合唯一键 学生编号
Teach_id Nvarchar 50 外键，组合唯一键 排课编号Administrator表
字段名 数据类型 长度 约束 描述
administrator Nvarchar 50 管理员号
password Nvarchar 50 密码Plan表（教学计划表）
字段名 数据类型 长度 约束 描述
plan_id nvarchar 50 主键 教学计划号
audience_id nvarchar 50 外键，组合唯一键 计划受众号
course_id nvarchar 50 外键，组合唯一键 课程号audience表（计划受众表）
字段名 数据类型 长度 约束 描述
auience_id nvarchar 50 主键约束 计划受众id
academy nvarchar 50 无 学院
major nvarchar 50 无 专业
grade nvarchar 50 无 年级
semester Int 无 学期六 数据库定义语句
CREATE DATABASE [Student_Select]
GO
USE [Student_Select]
GO
/****** Object: Table [dbo].[Teacher] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Teacher](
[teacher_id] [nvarchar](50) NOT NULL,
[name] [nvarchar](50) NULL,
[gender] [nchar](10) NULL,
CONSTRAINT [PK_Teacher] PRIMARY KEY CLUSTERED
(
[teacher_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[Teacher]([teacher_id], [name], [gender]) VALUES (N'1', N'1', N'1 ')
INSERT [dbo].[Teacher]([teacher_id], [name], [gender]) VALUES (N'2', N'2', N'2 ')
/****** Object: Table [dbo].[Course] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Course](
[course_id] [nvarchar](50) NOT NULL,
[name] [nvarchar](50) NULL,
[mode] [nvarchar](50) NOT NULL,
[credit] [nvarchar](50) NULL,
CONSTRAINT [PK_Course] PRIMARY KEY CLUSTERED
(
[course_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [IX_Course] UNIQUE NONCLUSTERED
(
[name] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'考核方式' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'Course', @level2type=N'COLUMN',@level2name=N'mode'
GO
INSERT [dbo].[Course]([course_id], [name], [mode], [credit]) VALUES (N'1', N'1', N'1', N'1')
INSERT [dbo].[Course]([course_id], [name], [mode], [credit]) VALUES (N'2', N'2', N'2', N'2')
/****** Object: Table [dbo].[audience] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[audience](
[audience_id] [nvarchar](50) NOT NULL,
[academy] [nvarchar](50) NULL,
[major] [nvarchar](50) NULL,
[grade] [nvarchar](50) NULL,
[semester] [int] NULL,
CONSTRAINT [PK_audience] PRIMARY KEY CLUSTERED
(
[audience_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'受众ID' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'audience', @level2type=N'COLUMN',@level2name=N'audience_id'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'学院' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'audience', @level2type=N'COLUMN',@level2name=N'academy'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'年级' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'audience', @level2type=N'COLUMN',@level2name=N'grade'
GO
EXEC sys.sp_addextendedproperty @name=N'MS_Description', @value=N'学期' , @level0type=N'SCHEMA',@level0name=N'dbo', @level1type=N'TABLE',@level1name=N'audience', @level2type=N'COLUMN',@level2name=N'semester'
GO
INSERT [dbo].[audience]([audience_id], [academy], [major], [grade], [semester]) VALUES (N'1', N'1', N'1', N'1', 1)
INSERT [dbo].[audience]([audience_id], [academy], [major], [grade], [semester]) VALUES (N'2', N'2', N'2', N'2', 2)
/****** Object: Table [dbo].[Administrator] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Administrator](
[administrator] [nvarchar](50) NULL,
[password] [nvarchar](50) NULL
) ON [PRIMARY]
GO
/****** Object: Table [dbo].[Student] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Student](
[student_id] [nvarchar](50) NOT NULL,
[gender] [nchar](10) NULL,
[name] [nvarchar](50) NULL,
[category] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_Student] PRIMARY KEY CLUSTERED
(
[student_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[Student]([student_id], [gender], [name], [category]) VALUES (N'1', N'1 ', N'1', N'1')
INSERT [dbo].[Student]([student_id], [gender], [name], [category]) VALUES (N'2', N'2 ', N'2', N'2')
/****** Object: Table [dbo].[Plan] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Plan](
[plan_id] [nvarchar](50) NOT NULL,
[audience_id] [nvarchar](50) NOT NULL,
[course_id] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_Plan] PRIMARY KEY CLUSTERED
(
[plan_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [IX_Plan] UNIQUE NONCLUSTERED
(
[audience_id] ASC,
[course_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[Plan]([plan_id], [audience_id], [course_id]) VALUES (N'1', N'1', N'1')
INSERT [dbo].[Plan]([plan_id], [audience_id], [course_id]) VALUES (N'2', N'2', N'2')
/****** Object: Table [dbo].[Teach] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Teach](
[teach_id] [nvarchar](50) NOT NULL,
[plan_id] [nvarchar](50) NULL,
[teacher_id] [nvarchar](50) NULL,
CONSTRAINT [PK_Teach] PRIMARY KEY CLUSTERED
(
[teach_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [IX_Teach_1] UNIQUE NONCLUSTERED
(
[teach_id] ASC,
[plan_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
INSERT [dbo].[Teach]([teach_id], [plan_id], [teacher_id]) VALUES (N'1', N'1', N'1')
INSERT [dbo].[Teach]([teach_id], [plan_id], [teacher_id]) VALUES (N'2', N'2', N'2')
/****** Object: Table [dbo].[Student_Selete] Script Date: 06/27/2018 10:37:01 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
CREATE TABLE [dbo].[Student_Selete](
[selete_id] [nvarchar](50) NOT NULL,
[student_id] [nvarchar](50) NOT NULL,
[teach_id] [nvarchar](50) NOT NULL,
CONSTRAINT [PK_Student_Selete] PRIMARY KEY CLUSTERED
(
[selete_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY],
CONSTRAINT [IX_Student_Selete_1] UNIQUE NONCLUSTERED
(
[student_id] ASC,
[teach_id] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = OFF, IGNORE_DUP_KEY = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
) ON [PRIMARY]
GO
/****** Object: ForeignKey [audience_id] Script Date: 06/27/2018 10:37:01 ******/
ALTER TABLE [dbo].[Plan] WITH CHECK ADD CONSTRAINT [audience_id] FOREIGN KEY([audience_id])
REFERENCES [dbo].[audience]([audience_id])
GO
ALTER TABLE [dbo].[Plan] CHECK CONSTRAINT [audience_id]
GO
/****** Object: ForeignKey [course_id] Script Date: 06/27/2018 10:37:01 ******/
ALTER TABLE [dbo].[Plan] WITH CHECK ADD CONSTRAINT [course_id] FOREIGN KEY([course_id])
REFERENCES [dbo].[Course]([course_id])
GO
ALTER TABLE [dbo].[Plan] CHECK CONSTRAINT [course_id]
GO
/****** Object: ForeignKey [plan_id] Script Date: 06/27/2018 10:37:01 ******/
ALTER TABLE [dbo].[Teach] WITH CHECK ADD CONSTRAINT [plan_id] FOREIGN KEY([plan_id])
REFERENCES [dbo].[Plan]([plan_id])
GO
ALTER TABLE [dbo].[Teach] CHECK CONSTRAINT [plan_id]
GO
/****** Object: ForeignKey [teacher_id] Script Date: 06/27/2018 10:37:01 ******/
ALTER TABLE [dbo].[Teach] WITH CHECK ADD CONSTRAINT [teacher_id] FOREIGN KEY([teacher_id])
REFERENCES [dbo].[Teacher]([teacher_id])
GO
ALTER TABLE [dbo].[Teach] CHECK CONSTRAINT [teacher_id]
GO
/****** Object: ForeignKey [student_zhujian] Script Date: 06/27/2018 10:37:01 ******/
ALTER TABLE [dbo].[Student_Selete] WITH CHECK ADD CONSTRAINT [student_zhujian] FOREIGN KEY([student_id])
REFERENCES [dbo].[Student]([student_id])
GO
ALTER TABLE [dbo].[Student_Selete] CHECK CONSTRAINT [student_zhujian]
GO
/****** Object: ForeignKey [teach_zhujian] Script Date: 06/27/2018 10:37:01 ******/
ALTER TABLE [dbo].[Student_Selete] WITH CHECK ADD CONSTRAINT [teach_zhujian] FOREIGN KEY([teach_id])
REFERENCES [dbo].[Teach]([teach_id])
GO
ALTER TABLE [dbo].[Student_Selete] CHECK CONSTRAINT [teach_zhujian]
GO