SQL数据库面试题以及答案

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2024年7月12日发(作者：)

SQL数据库面试题以及答案

Student(S#,Sname,Sage,Ssex)学生表

S#：学号

Sname：学生姓名

Sage：学生年龄

Ssex：学生性别

Course(C#,Cname,T#)课程表

C#：课程编号

Cname：课程名称

T#：教师编号

SC(S#,C#,score)成绩表

S#：学号

C#：课程编号

score：成绩

Teacher(T#,Tname)教师表

T#：教师编号：

Tname：教师名字

问题：

1、查询“001”课程比“002”课程成绩高的所有学生的学号

select a.S# from (select S#,score from SC where C#='001')a,

(select s#,sco re from SC where c#='002')b Where

> and a.s# = b.s#;

2、查询平均成绩大于60分的同学的学号和平均成绩

select S#, avg(score) from sc group by S# having

avg(score)>60

3、查询所有同学的学号、姓名、选课数、总成绩

select student.S#, , count(sc.C#), sum(score)

from student le ft outer join SC on student.S# = SC.S# group by

Student.S#, Sname

4、查询姓‘李’的老师的个数：

select count(distinct(Tname))

from teacher

where tname like '李%';

5、查询没有学过“叶平”老师可的同学的学号、姓名：

select student.S#,

from Student

where S# not in (select distinct(SC.S#) from

SC,Course,Teacher

where sc.c#=course.c# AND teacher.T#=course.T# AND

='叶平');

6、查询学过“叶平”老师所教的所有课的同学的学号、姓名：

select S#,Sname from Student

where S# in (select S# from SC ,Course ,Teacher

where SC.C#=Course.C# and Teacher.T#=Course.T#

and ='叶平' group by S#

having count(SC.C#)=(select count(C#) from Course,Teacher

where Teacher.T#=Course.T# and Tname='叶平'));

7、查询学过“011”并且也学过编号“002”课程的同学的学号、

姓名：

select Student.S#,

from Student,SC where Student.S#=SC.S#

and SC.C#='001'and

exists( Select * from SC as SC_2 where SC_2.S#=SC.S# and

SC_2.C#='002'); 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 S#,Sname

from (select Student.S#,,score ,

(select score from SC SC_2 where SC_2.S#=Student.S# and

SC_2.C#='002') sco re2

from Student,SC

where Student.S#=SC.S# and C#='001') S_2

where score2 < score;

9、查询所有课程成绩小于60的同学的学号、姓名：

select S#, sname

from student

where s# not in

(select student.s# from student, sc where s.s# = sc.s# and

score>60); 10、查询没有学全所有课的同学的学号、姓名：

select student.s#,

from student, sc

where student.s#=sc.s#

group by student.s#,

having count(c#)<(select count(c#) from course);

11、查询至少有一门课与学号为“1001”同学所学相同的同学的

学

号和姓名：

select s#, Sname

from Student, SC

where student.s# = sc.s#

and c# in (select c# from SC where s#='1001');

12、查询至少学过学号为“001”同学所有一门课的其他同学学

号和姓名；

select distinct sc.s# , sname

from student, sc

where student.s#=sc.s#

and c# in (select C# from sc where s#='001');

13、把“SC”表中“叶平”老师教的课的成绩都更改为此课程的

平均成绩：

Update Sc Set Score=(Select Avg(s2_Score) From sc s2 Where

s2.c#=sc.c#) Where c# IN

(Select c# From sc cs INNER JOIN Teacher tc ON cs.t#=tc.t#

WHERE tname ='叶平')

14、查询和“1002”号的同学学习的课程完全相同的其他同学学

号和姓名：

select s# from sc where c# in

(select c# from sc where s#='1002')

group by s# having count(*)=

(select count(*) from sc where s#='1002');

15、删除学习“叶平”老师课的SC表记录：

delect sc

from course, Teacher

where course.c#=sc.c#

and course.t#=teacher.t#

and tname='叶平';

16、向SC表中插入一些记录，这些记录要求符合以下条件：没有

上过编号“003”课程的同学学号、002号课的平均成绩：

Insert SC select S#,'002',

(Select avg(score) from SC where C#='002')

from Student where S# not in (Select S# from SC where

C#='002');

本文标签： 同学课程学号查询姓名