18、假设使用如下命令建立了一个grade表：
create table grade(low number(3,0),up number(3),rank char(1));
insert into grade values(90,100,’A’);
insert into grade values(80,89,’B’);
insert into grade values(70,79,’C’);
insert into grade values(60,69,’D’);
insert into grade values(0,59,’E’);
现查询所有同学的Sno、Cno和rank列
select sc.sno,sc.cno,g.rank from score sc
join grade g
on/where sc.degree between g.low and g.up;
题目18
19、查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录
select a.* from score a where a.cno='3-105' and a.degree>all(select degree
from score b where b.sno='109' and b.cno='3-105');
题目19
20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录
select * from score sc where degree<(select max(degree) from score)
group by sno having count(sno)>1
order by degree;
题目20
21、查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录
<b>同19题</b>
22、查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列
select sno,sname,sbirthday from student where year(sbirthday)=
(select year(sbirthday) from student where sno='108');
题目22
23、查询“张旭“教师任课的学生成绩
select sc.sno,sc.degree from score sc
join(teacher t,course c)
on sc.cno=c.cno and t.tno=c.tno
where t.tname='张旭';
题目23
24、查询选修某课程的同学人数多于5人的教师姓名
select t.tname from teacher t join (course c,score sc)
on (t.tno=c.tno and c.cno=sc.cno)
group by sc.cno having count(sc.cno) >5;
题目24
25、查询95033班和95031班全体学生的记录
select * from student
where class in ('95033','95031');
题目25
26、查询存在有85分以上成绩的课程Cno
解法一
select distinct cno from score where degree > 85;
解法二
select cno from score group by cno having max(degree)>85;
题目26
27、查询出“计算机系“教师所教课程的成绩表
解法一
select sc.* from score sc
join (teacher t,course c)
on sc.cno = c.cno and t.tno=c.tno
where t.depart = '计算机系';
解法二
select * from score where cno in
(select c.cno from course c join teacher t
on c.tno=t.tno and t.depart='计算机系');
题目27
28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof
select tname,prof from teacher
where depart='计算机系' and prof not in
(select prof from teacher where depart='电子工程系');
题目28
29、查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。
select cno,sno,degree from score
where degree >=(select min(degree) from score where cno='3-245')
<!-- any(select degree)-->
and cno='3-105'
order by degree desc;
题目29
30、查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree.
select cno,sno,degree from score
where degree >=(select max(degree) from score where cno='3-245')
and cno='3-105'
order by degree desc;
题目30
31、查询所有教师和同学的name、sex和birthday.
<!-- as 可以去掉-->
select sname as name,ssex as sex,sbirthday as birthday from student
union
select tname as name,tsex as sex,tbirthday as birthday from teacher;
题目31
32、查询所有“女”教师和“女”同学的name、sex和birthday.
<!-- as 可以去掉-->
select sname as name,ssex as sex,sbirthday as birthday from student
where ssex = '女'
union
select tname as name,tsex as sex,tbirthday as birthday from teacher
where tsex = '女';
题目32
33、查询成绩比该课程平均成绩低的同学的成绩表。
select sc.* from score sc
where degree <(select avg(degree) from score sc2
where sc.cno=sc2.cno);
题目33
34、查询所有任课教师的Tname和Depart.
select t.tname,t.depart from teacher t
join course c on t.tno=c.tno;
题目34
35、查询所有未讲课的教师的Tname和Depart.
关联字段名相同可用using，等同于 a.字段1=b.字段1
select tname,depart from teacher t
left join course c using(tno) where isnull (c.tno);
题目35
36、查询至少有2名男生的班号。
select class from student s where ssex='男'
group by class having count(ssex)>1;
题目36
37、查询Student表中不姓“王”的同学记录
select * from student where sname not like '王%';
题目37
38、查询Student表中每个学生的姓名和年龄
select sname,(year(now())-year(sbirthday)) age from student;
题目38
39、查询Student表中最大和最小的Sbirthday日期值
select sname,sbirthday from student where sbirthday = (select max(sbirthday) from student)
union
select sname,sbirthday from student where sbirthday = (select min(sbirthday)
from student);
题目39
40、以班号和年龄从大到小的顺序查询Student表中的全部记录
select class,(year(now())-year(sbirthday)) age from student
order by class desc,age desc;
题目40
41、查询“男”教师及其所上的课程
select t.tname,c.cname from teacher t
join course c using(tno) where t.tsex='男';
题目41
42、查询最高分同学的Sno、Cno和Degree列
select sno,cno,degree from score
where degree = (select max(degree) from score);
题目42
43、查询和“李军”同性别的所有同学的Sname
select sname from student
where ssex = (select ssex from student where sname='李军');
select s.sname from student s
where ssex = (select s2.ssex from student s2 where s2.sname='李军');
题目43
44、查询和“李军”同性别并同班的同学Sname.
select sname from student
where ssex=(select ssex from student where sname='李军')
and class=(select class from student where sname='李军');
select a.sname from student a
where ssex=(select b.ssex from student b where b.sname='李军')
and class=(select c.class from student c where c.sname='李军');
题目44
45、查询所有选修“计算机导论”课程的“男”同学的成绩表
解法1
select * from score
where sno in(select sno from student where ssex='男')
and cno=(select cno from course where cname='计算机导论');
解法2
select sc.* from score sc
join (student s,course c) using(sno,cno)
where s.ssex='男'and c.cname='计算机导论';
题目45
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