几道数据库原理题

1 b

2 a

3 a

4 b

5 c

6 c

7 c

多选题

8 ab

9 acd

10 ad

11 abcd

12 ab

13 abd

多选

判断题

14 错

15 对

16 错

17 对

18 错

19 错

20 错

create table borrower(

借书证号 char[5] primary key,

姓名 char[20] not null,

系名 char[10],

班级 char[10])

create table loans(

借书证号 char[5],

图书登记号 char[6],

结束日期 DATE,

primary key(借书证号，图书登记号),

foreign key(借书证号) reference borrower(借书证号),

foreign key(图书登记号 reference books(图书登记号))

create table books(

索书号 char[10],

书名 char[20],

图书登记号 char[6] primary key,

出版社 char[20],

价格 smallint))

(1)

select borrower.借书证号，姓名，系名，temp.total as 借书数量

from borrower,(select 借书证号,count(图书登记号) as total

from loans group by 借书证号

where tatal>5 as temp(借书证号，total))

(2)

select borrower.姓名，系名，书名，结束日期

from borrower,loans,books

where borrower.借书证号=loans.借书证号

and books.图书登记号=loans.图书登记号

and 书名 in(selcet 书名

from borrower,loans,books

where borrower.借书证号=loans.借书证号

and books.图书登记号=loans.图书登记号

and 姓名='赵垒')

(3)

create view SB

as

select borrower.借书证号，姓名，班级，books.图书登记号，书名，出版社

，借书日期

from borrower,book,loans

where borrower.借书证号=loans.借书证号

and books.图书登记号=loans.图书登记号

and 系名='信息系'

1

create table student(

sno char[10] primary key,

sname char[20] not null,

ssex char[2],

sage smallint check( sage between 16 and 30),

sdept char[4])

create table course(

cno char[10] primary key,

cname char[20] not null,

cteacher char[20])

create table sc(

sno char[10],

cno char[10],

grade smallint check(grade is null or grade between 0 and

100),

primary key(sno,cno)

foreign key sno reference student(sno),

foreign key cno reference course(cno))

2

insert into student values('102','李四','男',16,'数学')

下同

insert into course values('203',' *** 作系统','程羽')

下同

insert into sc values('101','203',82)

下同

3

(1) select cname,grade

from sc,student,course

where student.sno=sc.sno and course.cno=sc.cno

and sname='张三'

(2) select sname from student

where sno in(select sno from sc x

where not exists(

select * from sc y

where x.sno=y.sno

and y.grade<60))

(3) select cname,sname,grade

from student,course sc,(select cno,max(grade) from sc group by cno

as temp(cno,max))

where student.sno=sc.sno and course.cno=sc.cno

and grade=max and course.cno=temp.cno

4

delete * from sc where grade<60

5

update sc

set grade=(select avg(grade) from sc where cno='203')

where sno=105

仅供参考