用Transact-SQL代码实现创建数据库、数据库表、以及设置数据库表的约束

/*
用Transact-SQL代码实现创建数据库、数据库表、以及设置数据库表的约束
1、下面是一个学校要实现对学生、教师、课程以及学生选课、学生课程成绩、教师上课、教师上课报酬等信息进行统一管理，并开发一个教学信息系统
*/

CREATE DATABASE TeachingManageSYS
ON         PRIMARY
(         NAME = TeachingManageSys,
FILENAME = 'E:\TeachingManageSYS\TeachingManageSYS.mdf',
SIZE = 3072KB,MAXSIZE = UNLIMITED, FILEGROWTH = 1024KB        )

LOG ON
(         NAME = 'TeachingManageSYS_log',
FILENAME = 'E:\TeachingManageSYS\TeachingManageSYS_log.ldf',
SIZE = 1024KB,MAXSIZE = 2048GB, FILEGROWTH = 10%        )
GO

USE TeachingManageSYS
GO
CREATE TABLE CourseInfo                 /*课程信息表*/
(        
Cno                         char(4) PRIMARY KEY                 NOT NULL,
Cname                 char(10)         NOT NULL,
Credit                 real         NOT NULL,
CouresHour         int                 NOT NULL
        )
GO

CREATE TABLE RankPayMent         /*职别课酬*/
(
Trank                 char(6) PRIMARY KEY                 NOT NULL,
Payment                 real         NOT NULL
        )
GO

CREATE TABLE StuAchievement         /*成绩表*/
(
Sno                 char(6) PRIMARY KEY                 NOT NULL,
Sfundamental         real         NULL,
Sminor                 real         NULL
        )
GO

CREATE TABLE StudentCourse                 /*学生选课表*/
(
Sno                 char(6)         NOT NULL,
Cno                 char(4)                 NOT NULL,
Score         real         NULL
        )
GO

CREATE TABLE StudentInfo         /*学生信息表*/
(
Sno                 char(6) PRIMARY KEY                 NOT NULL,
Sname         char(10)         NOT NULL,
Ssex         char(2)                 NOT NULL,
Sage         int NOT                 NULL,
Saddress         varchar(30)         NULL,
Sphoto         image                 NULL,
Smemory         varbinary(100)                 NULL
        )
GO

CREATE TABLE Teach         /*教学表*/
(
Tno                 char(6)                 PRIMARY KEY                 NOT NULL,
Cno                 char(4)                 NOT NULL,
Ssatisfact         real                 NULL
        )
GO

CREATE TABLE TeacherInfo         /*教师信息表*/
(        
Tno                 char(6)                 PRIMARY KEY NOT NULL,
Tname         char(10)         NOT NULL,
Tsex         char(2)                 NOT NULL,
Tage         int                         NOT NULL,
Trank         char(6)                 NOT NULL,
Taddress         varchar(30)         NOT NULL,
Tphoto         image                 NULL,
Tmemory         varchar(100)         NULL
        )
GO

/**
设置约束
1、需要对TeacherInfo(教师信息表)的Tname字段进行约束，
     即根据学校实际情况规定教师姓名不能重复
*/
CREATE UNIQUE NONCLUSTERED INDEX UN_TeacherInfo
ON        dbo.TeachInfo
(
Tname
)
GO

/**设置外键*/
--USE TeachingManageSYS
--GO

/* StudentCourse(外键 Sno)--StudentInfo(主键 Sno);*/
ALTER TABLE StudentCourse WITH CHECK ADD
CONSTRAINT FK_StudentCourse_StudentInfo
FOREIGN KEY        (Sno)
REFERENCES StudentInfo (Sno)
GO

/* StudentCourse(外键 Cno)--CourseInfo(主键 Cno).*/
ALTER TABLE StudentCourse WITH CHECK ADD
CONSTRAINT FK_StudentCourse_CourseInfo
FOREIGN KEY        (Cno)
REFERENCES        CourseInfo        (Sno)
GO

/*TeacherInfo(外键 Trank)--RankPayment(主键 Trank)*/
--USE TeachingManageSYS
--GO
ALTER TABLE TeacherInfo        WITH CHECK ADD
CONSTRAINT FK_TeacherInfo_RankPayMent
FOREIGN        KEY (Trank)
REFERENCES        RankPayment        (Trank)
GO

/*设计CHECK值
规定StudentInfo表的Sage(年龄)必须在18岁到20岁之间。
*/
ALTER TABLE StudentInfo
ADD CONSTRAINT Sage_check
CHECK (Sage>=18 AND Sage<=20)
GO

/*设计默认值
教师大部分家庭住址都是在“四川成都”，
可以在TeacherInfo(教师信息表)的Taddress字段处定义默认值为“四川成都”
*/
ALTER TABLE dbo.TeacherInfo
ADD CONSTRAINT DF_TeacherInfo_Taddress
DEFAULT '四川成都' FOR Taddress
GO

/*输入数据
以StudentInfo表为例，采用INSERT命令输入三条记录数据，由于记录手机比较多，
我们不在列出全部的命令。
*/
INSERT INTO StudentInfo
                (Sno,Sname,Ssex,Sage,Saddress)
        VALUES
                ('010101','蔡依林','女','25','台湾台北')
INSERT INTO StudentInfo
                (Sno,Sname,Ssex,Sage,Saddress)
        VALUES
                ('010102','刘欢','男','45','北京海淀')
INSERT INTO StudentInfo
        VALUES
                ('010103','马化腾','男','39','深圳南山')
GO