2.
进入考试安排进入首页后,点击左侧菜单栏中“考试安排”。如下图所示:
3.
进入考试课程进入考试安排界面后,将会显示出自己期末考试将要考试的课程,在规定的考试时间内,将会出现一个绿色的按钮“进入机考”,点击“进入考试”将进入考试课程的界面,如下图所示:
4.
上传答卷点击“进入机考”按钮,进入到考试课程下,就可以开始查看试卷和上传答卷了,如下图:如上图所示,进入机考课程后,将会显示出三个部分:第一个部分:当前考试的课程信息第二个部分:学生可以在线预览试卷或者也可以点击“试卷下载”将试卷下载后再开始答题点击“答题纸下
borrower:create table borrower(
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
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