and prof not in --“计算机系”与“电子工程系”不同职称的教师Prof (select prof from teacher where depart ='计算机系' intersect
select prof from teacher where depart ='电子工程系')--“计算机系”与“电子工程系”相同职称的教师Prof
-- 30、查询选修编号为“3-105“课程且成绩至少高于一个选修编号为“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 cno='3-105'--选修编号为“3-105”课程的同学
and degree>any -- 大于任意一个选修编号为“3-245”的同学的成绩 (select degree from score where cno='3-245')--选修编号为“3-245”的同学的成绩 order by degree desc
-- 31、查询选修编号为“3-105“课程且成绩高于所有选修编号为“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 cno='3-105'--选修编号为“3-105”课程的同学
and degree>all -- 大于所有选修编号为“3-245”的同学的成绩 (select degree from score where cno='3-245')--选修编号为“3-245”的同学的成绩 order by degree desc
数据库
wzm
-- 32、查询所有教师和同学的name、sex和birthday. 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
-- 33、查询所有“女”教师和“女”同学的name、sex和birthday. 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'
-- 34、查询成绩比该课程平均成绩低的同学的成绩表。 select * from score as s1 where degree<
(select avg(degree) from score as s2 group by cno having s1.cno=s2.cno)
-- 35、查询所有任课教师的Tname和Depart. select tname,depart from teacher where tno in (select tno from course)-- 课程表中存在的教师编号
-- 36、 查询所有未讲课的教师的Tname和Depart.
数据库
wzm
select tname,depart from teacher where tno in
(select tno from course where cno not in(select cno from course group by cno)) 备注：如果课程表中课程确定不为空，也可以如下编写： select Tname,Depart from Teacher where Tno not in (select Tno from Course)
-- 37、查询至少有2名男生的班号。
select class,ssex,count(ssex) as 男生人数 from student group by class,ssex having ssex='男' and count(ssex)>1； select Class,COUNT(*) from Student where Ssex='男'group by Class having COUNT(*)>=2；
-- 38、查询Student表中不姓“王”的同学记录。 select * from student where sname not like '王%'
-- 39、查询Student表中每个学生的姓名和年龄。
select sname,datediff(year,Sbirthday,current_timestamp)as 年龄 from student； select sname,datediff(year,Sbirthday,getdate()) as 年龄 from student； select sname,datepart(year,getdate())-datepart(year,Sbirthday) as 年龄 from student；
-- 40、查询Student表中最大和最小的Sbirthday日期值。
数据库
wzm
select datepart(year,max(sbirthday))as
max,datepart(year,min(sbirthday)) as min from student; select max(year(sbirthday))as max,min(year(sbirthday)) as min from student;
-- 41、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 class desc,Sbirthday
-- 42、查询“男”教师及其所上的课程。
select tname,tsex,cname from teacher left join course on course.tno=teacher.tno where tsex='男'
-- 43、查询最高分同学的Sno、Cno和Degree列。 select student.sno,cno,degree from student join Score on Score.sno=student.sno
where degree=(select max(degree) from score);
-- 44、查询和“李军”同性别的所有同学的Sname.
select sname from student where ssex= --与李军同性别的同学姓名 (select ssex from student where sname='李军')--李军的性别 and sname not in('李军')--从中去除李军
-- 45、查询和“李军”同性别并同班的同学Sname.
数据库 wzm
select sname from student where --与李军同性别并同班的同学姓名 ssex=(select ssex from student where sname='李军')----与李军同性别的同学姓名 and class=(select class from student where sname='李军')----与李军同班的同学姓名 and sname not in ('李军');--从中去除李军
-- 46、查询所有选修“计算机导论”课程的“男”同学的成绩表。 方法1：select degree from score join student on student.sno=score.sno join course on course.cno=score.cno where ssex='男' and cname='计算机导论' 方法2：select degree from score where Sno in(select sno from student where ssex='男')
and cno in(select cno from course where cname='计算机导论')
-- 47、查询出选修课程号为3-245和6-166的课程的学生学号与姓名 select student.Sno,sname from student join score on student.Sno=score.sno where cno in('3-245','6-166')
-- 48、查询出没有选修课程号为3-245和6-166的课程的学生学号与姓名
数据库
wzm
select student.Sno,sname from student join score on student.Sno=score.sno where cno not in('3-245','6-166')
数据库wzm