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2024年4月17日发(作者:ibm pc汇编语言程序设计)

常见SQL数据库面试题和答案(一)

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

名字;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 # from (select s#,score from SC where C#='001') a,(select s#,score

from SC where C#='002') b

where > and #=#;

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 #,,count#),sum(score)

from Student left Outer join SC on #=#

group by #,Sname

4、查询姓“李”的老师的个数;

select count(distinct(Tname))

from Teacher

where Tname like '李%';

5、查询没学过“叶平”老师课的同学的学号、姓名;

select #,

from Student

where S# not in (select distinct( #) from SC,Course,Teacher where #=# and

#=# and ='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 #, from Student,SC where #=# and #='001'and exists( Select * from SC

as SC_2 where #=# and #='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 S#,Sname

from Student

where S# in (select S# from SC ,Course ,Teacher where #=# and #=# and ='叶

平' group by S# having count#)=(select count(C#) from Course,Teacher where

#=# and 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 S#,Sname from (select #,,score ,(select score from SC SC_2 where #=#

and #='002') score2

from Student,SC where #=# and C#='001') S_2 where score2

9、查询所有课程成绩小于60分的同学的学号、姓名;

select S#,Sname

from Student

where S# not in (select # from Student,SC where #=# and score>60);

10、查询没有学全所有课的同学的学号、姓名;

select #,

from Student,SC

where #=# group by #, having count(C#) <(select count(C#) from Course);

11、查询至少有一门课与学号为“1001”的同学所学相同的同学的学号和姓名;

select S#,Sname from Student,SC where #=# 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 #,Sname

from Student,SC

where #=# 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

from SC SC_2

where #=# ) from Course,Teacher where #=# and #=# and ='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 #=# and #= # 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、2、


本文标签: 同学 学号 课程