建表Table

Sstudent表

 

学  号    Sno	姓  名   Sname	性  别    Ssex	年  龄      Sage	所 在 系    Sdept
200215121   200215122   200215123   200515125	李勇   刘晨   王敏   张立	男   女   女   男	20   19   18   19	CS     CS     MA     IS

 

Course表

 

课程号 Cno	课程名    Cname	先行课   Cpno	学分  Ccredit
1 2 3 4 5 6 7	数据库    数学    信息系统    操作系统    数据结构    数据处理    PASCAL语言	5       1     6     7       6	4 2 4 3 4 2 4

 

 

SC表

 

学 号 Sno	课程号   Cno	成绩     Grade
200215121    200215121    200215121    200215122    200215122	1   2   3   2   3	92  85  88  90  80

 

student 表

create table student
(
sno char(10)     primary key,
sname char(20)    not null,
Ssex char(20)    check( Ssex in('男','女')),
Sage smallint    check(Sage between 12 and 40),
Sdept char(20)
)   


insert into student values('200215121','李勇','男',20,'CS')
insert into student values('200215122','刘晨','女',19,'CS')
insert into student values('200215123','王敏','女',18,'MA')
insert into student values('200215125','张立','男',19,'IS')


 

course表
create table course
(
 cno char(10) ,    --primary key
cname char(20),
Cpno char(10),
Ccredit smallint,
constraint cPK primary key(cno),
 constraint cFK foreign key(Cpno) references course(cno)
)  


insert into course values('1','数据库',null,4)
insert into course values('2','数学',null,2)
insert into course values('3','信息系统',null,4)
insert into course values('4','操作系统',null,3)
insert into course values('5','数据结构',null,4)
insert into course values('6','数据处理',null,2)
insert into course 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

 
sc 表  完整约束命名子 句----约束名称不能 重复
________________________________________
create table sc
(
sno char(10) not null,
cno char(10) not null,
grade smallint check(grade>=0 and grade<=100),
constraint sPK primary key(sno,cno),
constraint sFK foreign key(sno) references student(sno) on delete cascade  
                                                        on update cascade,
constraint sFK foreign key(cno) references course(cno) on delete no action
                                                       on update  cascade
)      


 
sc 表
create table sc
(
sno char(9) not null,
cno char(10) not null,
grade smallint check(grade>=0 and grade<=100),
constraint sPK primary key(sno,cno),
constraint sFK1 foreign key(sno) references student(sno) on delete cascade  
                                                        on update cascade,
constraint sFK2 foreign key(cno) references course(cno) on delete no action
                                                       on update  cascade
)      




 
sc表.note
________________________________________
 


create table sc
(  sno char(9),
   cno char(10),
   grade smallint,
primary key(sno, cno),
foreign key(sno) references student(sno),
foreign key(cno) references course(cno)
)