SQL面试题（1-10）oracle写的

Student(SID, Sname, Sage, Ssex) 学生表
Course(CID, Cname, TID) 课程表
SC(SID, CID, score) 成绩表
Teacher(TID, Tname) 教师表

student学生表：

create table student
(SID char(7) primary key not null,Sname varchar(11) not null,Sage number not null,Ssex char(2) not null
);

course课程表

create table course
(CID char(3) primary key not null,Cname varchar(20) not null,TID varchar(10) not null
);

sc成绩表

create table SC
(SID char(7) not null,CID char(3) not null,score number,primary key(SID,CID)
);

teacher教师表

create table Teacher
(TID char(5) primary key not null,Tname varchar(10) not null
);

插入数据：

insert into student values('0000001','张三',18,'男');
insert into student values('0000002','张四',17,'男');
insert into student values('0000003','王五',18,'女');
insert into student values('0000004','李六',20,'男');

insert into course values('001','Java','00001');
insert into course values('002','C++','00002');
insert into course values('003','C','00003');
insert into course values('004','JavaScript','00004');
insert into course values('005','python','00001');
insert into course values('006','C#','00001');
insert into course values('007','SqlServer','00001');
insert into course values('008','Oracle','00001');

insert into SC values('0000001','001',80);
insert into SC values('0000001','002',80);
insert into SC values('0000001','003',88);
insert into SC values('0000001','006',80);
insert into SC values('0000001','007',80);
insert into SC values('0000001','008',88);
insert into SC values('0000001','005',58);
insert into SC values('0000002','001',21);
insert into SC values('0000002','002',55);
insert into SC values('0000002','003',39);
insert into SC values('0000002','004',58);
insert into SC values('0000002','007',31);
insert into SC values('0000002','005',45);
insert into SC values('0000002','006',55);
insert into SC values('0000003','001',48);
insert into SC values('0000003','003',83);
insert into SC values('0000003','004',90);
insert into SC values('0000003','005',88);
insert into SC values('0000003','007',70);
insert into SC values('0000004','001',45);
insert into SC values('0000004','002',65);
insert into SC values('0000004','004',61);
insert into SC values('0000004','007',78);
insert into SC values('0000003','006',68);

insert into teacher values('00001','叶平');
insert into teacher values('00002','叶凡');
insert into teacher values('00003','李平');
insert into teacher values('00004','王平');

1、查询“001”课程比“002”课程成绩高的所有学生的学号；

select SC1.SID from SC SC1,SC SC2
where SC1.SID = SC2.SID
and SC1.CID = '001'
and SC2.CID = '002'
and SC1.score > Sc2.score;

2、查询平均成绩大于60分的同学的学号和平均成绩；

select SID,avg(score) from SC
group by SID
having avg(score) > 60

3、查询所有同学的学号、姓名、选课数、总成绩；

select S.SID,S.Sname,count(*) 选课数,sum(score) 总成绩 from student S,SC
where S.SID = SC.SID
group by S.SID,S.Sname

4、查询姓“李”的老师的个数；

select count(*) 姓李老师的个数 from Teacher
where Tname like '李%'

5、查询没学过“叶平”老师课的同学的学号、姓名

select SID, Sname
from student
where SID not in
(select distinct sidfrom scwhere CID in(      select CIDfrom coursewhere TID = (select TID from teacher where Tname = '叶平'))
);

6、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名；

select SID,Sname
from student
where SID in
(select SC1.SIDfrom SC SC1,SC SC2where SC1.SID = SC2.SIDand SC1.CID = '001'and SC2.CID = '002'
);

7、查询学过“叶平”老师所教的所有课的同学的学号、姓名；

select student.SID,student.sname
from student,
(    select sid,count(*) cnt from scwhere cid  in(     select cid from course where tid = (select tid from teacher where Tname ='叶平'))group by sid
) c
where student.sid = c.sid
and c.cnt =
(select count(*) from course where tid = (select tid from teacher where Tname ='叶平')
)

8、查询课程编号“002”的成绩比课程编号“001”课程低的所有同学的学号、姓名；

select sid,sname from student
where sid in
(    select sc1.sid from sc sc1,sc sc2where sc1.sid = sc2.sid and sc1.cid = '001'and sc2.cid = '002' and sc1.score < sc2.score
)

9、查询所有课程成绩小于60分的同学的学号、姓名；

select sid,sname from student
where sid not in
(select distinct sid from sc where score >= 60
);

—10、查询没有学全所有课的同学的学号、姓名；

select sid,sname from student
where sid in
(select sc.sid from sc,(select sid,count(*) cnt from sc group by sid) cwhere sc.sid = c.sid and c.cnt <(select count(*) from course)
);

select t.sid,t.sname from
(      select student.sid sid,student.sname sname,count(distinct(sc.sid)) cnt from student,scwhere student.sid = sc.sidgroup by student.sid,student.sname
) t
where t.cnt <(select count(distinct(cid)) from sc)

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