数据库机试题

❶ SQL数据库试题~~~~~~~~~~

updateStudentsetsex='女'wherename='张三'returningageinto:var

❷ 跪解以下2道数据库系统原理上机试题

borrower:
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','操作系统','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

❸ 数据库试题

1 、B
2、B
3、c
4、 delete

题3，注

real
近似数值型
real 数据类型像浮点数一样，是近似数值类型。它可以表示数值在-3.40E+38到3.40E+38之间的浮点数

http://..com/link?url=WEQbFYg813wlu4_lFSWL-XSJZFrGSRzUzm-FuG1Zisrcou_9ZvwyemkIqICVK-AVTvydFrf5fd4FGhiDidz5UK
(里面有的答错，参考评论3)

❹ 计算机等级考试三级数据库机试题难吗

三级数据库的上机是C语言，如果你没有学过C，最好把C看一下，不过C++你都会的话这个不会很难。三级上机C还不如二级的上机难，都是些比较简单的题目。笔试看书就好，我考的时候数据库数据结构都没学，自学就可以应付