1、 查询Student表中的所有记录的Sname、Ssex和Class列。
select sname,ssex,class from student
2、 查询教师所有的单位即不重复的Depart列。
select distinct depart from teacher
3、 查询Student表的所有记录。
select * from student
4、 查询Score表中成绩在60到80之间的所有记录。
select * from score where degree between 60 and 80
5、 查询Score表中成绩为85，86或88的记录。
select * from score where degree ="85" or degree="86" or degree="88"
6、 查询Student表中“95031”班或性别为“女”的同学记录。
select * from student where class='95031' or ssex='女'
7、 以Class降序查询Student表的所有记录。
select * from student order by class desc
8、 以Cno升序、Degree降序查询Score表的所有记录。
select * from score order by cno,degree desc
9、 查询“95031”班的学生人数。
select count(1) from student where class='95031'
10、 查询Score表中的最高分的学生学号和课程号。（子查询或者排序）
select sno,cno from score where degree=(select max(degree) from score )
11、 查询每门课的平均成绩。
select avg(degree) as 平均成绩,cno from score group by cno
12、查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。
select avg(degree),cno from score where cno like"3%" group by cno having count(1)>=5
13、查询分数大于70，小于90的Sno列。
select sno from score where degree>70 and degree <90
14、查询所有学生的Sname、Cno和Degree列。
select student.sname,score.cno,score.degree from student,score where student.sno = score.sno
15、查询所有学生的Sno、Cname和Degree列。
select score.sno,course.cname,score.degree from course,score where course.cno = score.cno
16、查询所有学生的Sname、Cname和Degree列。
select student.sname,course.cname,score.degree from student,course,score where student.sno = score.sno and score.cno = course.cno
17、 查询“95033”班学生的平均分。
select avg(degree) from student,score where student.sno = score.sno and student.class="95033"
18、 假设使用如下命令建立了一个grade表：
create table grade(low int(3),upp int(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。
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 * from score where cno = "3-105" and degree>(select degree from score where sno="109" and cno="3-105")
20、查询score中选学多门课程的同学中分数为非最高分成绩的记录。
select *from score a where degree not in
(select max(degree) from score b where b.cno=a.cno)
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。
select * from score where degree > (select degree from score where cno='3-105' and sno='109')
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='109')
23、查询“张旭“教师任课的学生成绩。
select * from score where cno =(select cno from course where tno =
(select tno from teacher where tname='张旭'))
24、查询选修某课程的同学人数多于5人的教师姓名。
select tname from teacher where tno= (select tno from course where cno= (select cno from score group by cno having count(*)>5))
25、查询95033班和95031班全体学生的记录。
select * from student,score where class in ('95033','95031') and student.sno=score.sno
26、 查询存在有85分以上成绩的课程Cno.
select distinct cno from score where degree > 85
27、查询出“计算机系“教师所教课程的成绩表。
select * from score where cno in (select cno from course where tno in (select tno from teacher where depart='计算机系'))
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 prof not in (select prof from teacher where depart = '电子工程系' and prof in(select prof from teacher where depart = '计算机系')
) and depart in ('计算机系','电子工程系')
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 * from score where cno='3-105' and degree>(select min(degree) from score where cno='3-245') order by degree desc
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 * from score where cno='3-105' and degree>(select max(degree) from score where cno='3-245') order by degree desc
31、 查询所有教师和同学的name、sex和birthday.
select sname,ssex,sbirthday from student
union
select tname,tsex,tbirthday from teacher
32、查询所有“女”教师和“女”同学的name、sex和birthday.
select sname,ssex,sbirthday from student where ssex='女'
union
select tname,tsex,tbirthday from teacher where tsex='女'
33、 查询成绩比该课程平均成绩低的同学的成绩表。
select * from score where score.degree<
(select avg(degree) from score where score.cno=score.cno)
34、查询所有任课教师的Tname和Depart.
select tname,depart from teacher where tno in (select distinct tno from course)
35 、 查询所有未讲课的教师的Tname和Depart.
select tname,depart from teacher where tno not in (select distinct tno from course)
36、查询至少有2名男生的班号。
select class from student where ssex='男' group by class having count(1)>=2
37、查询Student表中不姓“王”的同学记录。
select * from student where sname not like '王%'
38、查询Student表中每个学生的姓名和年龄。
select sname,YEAR(CURDATE())-year(sbirthday) as 年龄 from student
39、查询Student表中最大和最小的Sbirthday日期值。
select max(sbirthday) ,min(sbirthday) from student
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 *from student order by sbirthday, class desc
41、查询“男”教师及其所上的课程。
select *from course join teacher on course.tno=teacher.tno where tsex='男'
42、查询最高分同学的Sno、Cno和Degree列。
select *from score where degree = (select max(degree) from score)
43、查询和“李军”同性别的所有同学的Sname.
select sname from student where ssex in (select ssex from student where sname='李军')
44、查询和“李军”同性别并同班的同学Sname.
select sname from student where ssex in (select ssex from student
where sname='李军') and class in (select class from student
where sname='李军')
45、查询所有选修“计算机导论”课程的“男”同学的成绩表。
select sname,degree from student,score,course where student.sno = score.sno and score.cno= course.cno and course.cname = "计算机导论" and student.ssex="男"