如何创建学生成绩数据库？答案

【问题标题】：how can I create students marks database?如何创建学生成绩数据库？
【发布时间】：2014-11-11 18:28:57
【问题描述】：

我正在尝试为学生的分数建立一个数据库（访问）。每个学生都有许多课程和每门课程的不同分数。例子约翰：

数学 Q1 = 80, Q2= 90, Q3=77

艺术 Q1=75, Q2=85, Q3=80

等等我建立了3个关系如下的表学生（id-name-grade）课程（课程ID-课程名称）分数（id-courseid-Q1-Q2-Q3）

我的工作正确吗？因为我将它升级到SQL，所以我需要知道报表和表单的表和关系是否相同？

【问题讨论】：

标签： sql-server-2008 ms-access-2007

【解决方案1】：

好的，但是您应该重命名一些字段：课程（id，名称），标记（stu_id，course_id，Q1，Q2，Q3）

SQL（我用的是PostgreSQL，但我觉得其他DBMS类似）

CREATE TABLE students
(
id integer NOT NULL,
fname varchar(20),
lname varchar(20),
grade integer,
PRIMARY KEY (id)
);

CREATE TABLE courses
(
id integer NOT NULL,
name varchar(20),
PRIMARY KEY (id)
);

CREATE TABLE marks
(
stu_id integer REFERENCES students(id),
course_id integer REFERENCES courses(id),
Q1 double,
Q2 double,
Q3 double,
PRIMARY KEY (stu_id, course_id)
);

或

CREATE TABLE marks
(
id integer NOT NULL,
stu_id integer REFERENCES students(id),
course_id integer REFERENCES courses(id),
Q1 double,
Q2 double,
Q3 double,
PRIMARY KEY (id)
);

希望你的帮助

【讨论】：

【解决方案2】：

您应该在标记表中使用复合键。这不会限制你只有 3 个问题。

用于创建表的 Ms Sql Query 将如下所示-

/****** Object:  Table [dbo].[students]    Script Date: 11/11/2014 16:20:05 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[students](
    [id] [int] NOT NULL,
    [fname] [varchar](20) NULL,
    [lname] [varchar](20) NULL,
    [grade] [int] NULL,
PRIMARY KEY CLUSTERED 
(
    [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

SET ANSI_PADDING OFF
GO




/****** Object:  Table [dbo].[courses]    Script Date: 11/11/2014 16:19:59 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

SET ANSI_PADDING ON
GO

CREATE TABLE [dbo].[courses](
    [id] [int] NOT NULL,
    [name] [varchar](20) NULL,
PRIMARY KEY CLUSTERED 
(
    [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

SET ANSI_PADDING OFF
GO



/****** Object:  Table [dbo].[marks]    Script Date: 11/11/2014 16:19:37 ******/
SET ANSI_NULLS ON
GO

SET QUOTED_IDENTIFIER ON
GO

CREATE TABLE [dbo].[marks](
    [stu_id] [int] NOT NULL,
    [course_id] [int] NOT NULL,
    [q_id] [int] NOT NULL,
    [mark] [numeric](18, 0) NOT NULL,
 CONSTRAINT [PK_marks] PRIMARY KEY CLUSTERED 
(
    [stu_id] ASC,
    [course_id] ASC,
    [q_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

ALTER TABLE [dbo].[marks]  WITH CHECK ADD  CONSTRAINT [FK_marks_courses] FOREIGN     KEY([course_id])
REFERENCES [dbo].[courses] ([id])
GO

ALTER TABLE [dbo].[marks] CHECK CONSTRAINT [FK_marks_courses]
GO

ALTER TABLE [dbo].[marks]  WITH CHECK ADD  CONSTRAINT [FK_marks_students] FOREIGN     KEY([stu_id])
REFERENCES [dbo].[students] ([id])
GO

ALTER TABLE [dbo].[marks] CHECK CONSTRAINT [FK_marks_students]
GO

【讨论】：