sql经典练习题库(附答案)

2023年6月21日发(作者：)

SQL练习题库

表结构

Student(S#,Sname,Sage,Ssex) 学生表

Course(C#,Cname,T#) 课程表

SC(S#,C#,score) 成绩表

Teacher(T#,Tname) 教师表

试题：

1、查询“0001”课程比“C002”课程成绩高的所有学生的学号；

Select s# from sc

Where c#='0001' and score>any(select score from sc c#='0002')

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#)as 选课数,sum(score)总成绩 from student,sc

where student.s#=sc.s#

group by student.s#,

4、查询姓“张”的老师的个数；

select count(*)人数 from teacher

where tname like'张%'

5、查询没学过“叶平”老师课的同学的学号、姓名；

select student.s#, from student,course,teacher,sc

where student.s#=sc.s# and course.t#=teacher.t# and teacher.t# not in(select t# from teacher where tname='张丽芬')

group by student.s#,

6、查询学过“0001”并且也学过编号“0002”课程的同学的学号、姓名；

select sc.s#,sname from sc,student

where sc.c# = '0001' and student.s# = sc.s# and sc.s# in (select s# from sc where sc.c# = '0002')

--并（两表值）

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0001'

union

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0002'

--交（有相同值）

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0001'

intersect

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0002'

--差（不同值）

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0001'

except

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0002'

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.s#, from student,course,teacher,sc

where student.s#=sc.s# and course.t#=teacher.t# and teacher.t# in(select t# from teacher where tname='张丽芬')

group by student.s#,

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

select student.s#,sname,score from student,sc

where student.s#=sc.s# and score in(( select score from sc where c#='0001' )

9、查询所有课程成绩小于60分的同学的学号、姓名；

select student.s#,sname from student

where s# in(

select s# from sc where 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”的同学所学相同的同学的学号和姓名；

select student.s#, from student,sc

where student.s#=sc.s# and c#=any(

select c# from sc

where s#='1001'

)

group by student.s#,

12、查询至少学过学号为“0001”同学所有一门课的其他同学学号和姓名；

Select sc.s#,sname from sc inner join student on sc.s#=student.s#

Where c# in (select c# from sc where s#=’0001’)

13、把“SC”表中“赵雁南”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,teacher,course

where sc.c#=course.c# and course.t#=teacher.t# and ='赵雁南')

where sc.c#=(select c# from course,teacher where course.t#=teacher.t# and tname='赵雁南' )

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 student.s#,sname from student,sc

where student.s#=sc.s# and sc.c#=all(select c# from sc where s#='1005') and student.s#<>'1005'

15、删除学习“朱玉文”老师课的SC表记录；

delete from sc

where c# in(select c# from sc where c# in (select c# from course,teacher where teacher.t#=course.t# and ='朱玉文' ) )

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“0002”课程的同学学号、号课的平均成绩；

insert into sc

values

select s# from sc where s# not in (select s# from sc where c#='0002'

select avg(score) as 平均成绩 from sc where c#='0002'

17、按平均成绩从高到低显示所有学生的“数据库”、“企业管理”、“英语”三门的课程成绩，按如下形式显示：学生ID,,数据库,企业管理,英语,有效课程数,有效平均分

select sc.s#,,,avg(score)as 平均成绩 from sc inner join course on sc.c#=course.c#

where sc.c# in(select c# from course where cname=any(select cname from course where cname in('计算机基础','Oracle','软件工程'))) group by sc.s#,,

order by avg(score) desc

SELECT S# as 学生ID

,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='0001') AS 计算机基础

,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='0002') AS Oracle

,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='0011') AS 软件工程

,COUNT(*) AS 有效课程数, AVG() AS 平均成绩

FROM sc AS t

GROUP BY S#

ORDER BY avg() desc

18、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分

select c# 课程ID,max(score) 最高分,min(score) 最低分 from sc

group by c#

19、按各科平均成绩从低到高和及格率的百分数从高到低顺序

select c#, avg(score) from sc

where score>60

group by c#

20、查询如下课程平均成绩和及格率的百分数(用"1行"显示): 企业管理（），马克思（），OO&UML

21、查询不同老师所教不同课程平均分从高到低显示

select course.t#,avg() as 平均分 from sc,course

where sc.c#=course.c#

group by course.t#

order by avg() desc

22、查询如下课程成绩第3 名到第6 名的学生成绩单：企业管理，马克思，UML，数据库

[学生ID],[学生姓名],企业管理,马克思,UML,数据库,平均成绩

select student.s#,,, from student inner join sc on student.s#=sc.s#

inner join course on sc.c#=course.c#

where in('oracle','电路分析','计算机基础')

order by , desc

23、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]

select sc.c#,,count(*)人数 from sc,course

where course.c#=sc.c#

group by sc.c#,

24、查询学生平均成绩及其名次

select sc.s#,avg(score) from sc

group by sc.s#

order by avg(score) desc

25、查询各科成绩前三名的记录考虑成绩并列情况

select s#,c# ,score from sc

where score in (

select distinct top 3 score from sc

group by c#,score

)

order by score desc

26、查询每门课程被选修的学生数

，数据库（）（）

select c# as 课程号,count(c#)as 选修人数 from sc

group by c#

order by count(c#) desc

27、查询出只选修了一门课程的全部学生的学号和姓名

select sc.s#, from sc inner join student on student.s#=sc.s#

group by sc.s#,

having count(c#)=1

28、查询男生、女生人数

select ssex, count(*) as 总人数 from student

group by ssex

29、查询姓“张”的学生名单

select sname from student

where sname like '张%'

30、查询同名同性学生名单，并统计同名人数

select ssex,count(*) from student

group by ssex

31、同年出生的学生名单(注：Student表中Sage列的类型是datetime)

32、查询每门课程的平均成绩，结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列

select c#,avg(score)平均成绩 from sc

group by c#

order by avg(score) asc

33、查询平均成绩大于的所有学生的学号、姓名和平均成绩

select top 1 student.s#,,avg(score)平均成绩 from student inner join sc on student.s#=sc.s#

group by student.s#,

order by avg(score) desc

34、查询课程名称为“数据库”，且分数低于80的学生姓名和分数

select , from sc,student,course

where student.s#=sc.s# and sc.c#=course.c# and ='计算机基础' and <80

group by ,

35、查询所有学生的选课情况；

select student.s#,sname,c# from student left join sc on student.s#=sc.s#

36、查询任何一门课程成绩在70分以上的姓名、课程名称和分数；

select ,, from student,sc,course

where student.s#=sc.s# and sc.c#=course.c# and >70

order by score desc

37、查询不及格的课程，并按课程号从大到小排列

select c#,score from sc

where score<60

order by c#

38、查询课程编号为0001且课程成绩在70分以上的学生的学号和姓名；

select student.s#,sname from sc,student

where c#='0001' and score>70 and student.s#=sc.s#

39、求选了课程的学生人数

select count(s#)人数 from sc

where <>0

40、查询选修“oracle”课程的学生中，成绩最高的学生姓名及其成绩

select top 1 ,max()成绩最高 from student inner join sc on student.s#=sc.s# inner join course on

sc.c#=course.c# where ='oracle'

group by

order by max() desc

41、查询各个课程及相应的选修人数

select ,count(sc.c#) as 选修人数 from sc inner join course on sc.c#=course.c#

group by

order by count(sc.c#) desc, asc

42、查询不同课程成绩相同的学生的学号、课程号、学生成绩

43、查询每门功成绩最好的前两名

SELECT t1.S# as 学生ID,t1.C# as 课程ID,Score as 分数 FROM SC t1

WHERE score IN (SELECT TOP 2 score FROM SC

WHERE t1.C#= C#

ORDER BY score DESC

)

ORDER BY t1.C#

44、统计每门课程的学生选修人数（超过人的课程才统计）。要求输出课程号和选修人数，查询结果按人数降序排列，查询结果按人数降序排列，若人数相同，按课程号升序排列

45、检索至少选修两门课程的学生学号

select s#, count(s#) as 选修课程数 from sc

group by s#

having count(s#)>1

46、查询全部学生都选修的课程的课程号和课程名

select c#,cname from course

where c# in(select c# from sc)

47、查询没学过“叶平”老师讲授的任一门课程的学生姓名

select Sname from Student

where S# not in (

select S# from Course,Teacher,SC

where Course.T#=Teacher.T# and SC.C#=course.C# and Tname='朱玉文')

48、查询两门以上不及格课程的同学的学号及其平均成绩

49、检索“”课程分数小于，按分数降序排列的同学学号

select s#,score from sc

where score<60

order by score desc

50、删除“1005”同学的“0004”课程的成绩

delete from sc

where s#='1005' and c#='0004'

2023年6月21日发(作者：)

SQL练习题库

表结构

Student(S#,Sname,Sage,Ssex) 学生表

Course(C#,Cname,T#) 课程表

SC(S#,C#,score) 成绩表

Teacher(T#,Tname) 教师表

试题：

1、查询“0001”课程比“C002”课程成绩高的所有学生的学号；

Select s# from sc

Where c#='0001' and score>any(select score from sc c#='0002')

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#)as 选课数,sum(score)总成绩 from student,sc

where student.s#=sc.s#

group by student.s#,

4、查询姓“张”的老师的个数；

select count(*)人数 from teacher

where tname like'张%'

5、查询没学过“叶平”老师课的同学的学号、姓名；

select student.s#, from student,course,teacher,sc

where student.s#=sc.s# and course.t#=teacher.t# and teacher.t# not in(select t# from teacher where tname='张丽芬')

group by student.s#,

6、查询学过“0001”并且也学过编号“0002”课程的同学的学号、姓名；

select sc.s#,sname from sc,student

where sc.c# = '0001' and student.s# = sc.s# and sc.s# in (select s# from sc where sc.c# = '0002')

--并（两表值）

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0001'

union

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0002'

--交（有相同值）

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0001'

intersect

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0002'

--差（不同值）

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0001'

except

select student.s#, from student,sc

where student.s#=sc.s# and sc.c#='0002'

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.s#, from student,course,teacher,sc

where student.s#=sc.s# and course.t#=teacher.t# and teacher.t# in(select t# from teacher where tname='张丽芬')

group by student.s#,

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

select student.s#,sname,score from student,sc

where student.s#=sc.s# and score in(( select score from sc where c#='0001' )

9、查询所有课程成绩小于60分的同学的学号、姓名；

select student.s#,sname from student

where s# in(

select s# from sc where 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”的同学所学相同的同学的学号和姓名；

select student.s#, from student,sc

where student.s#=sc.s# and c#=any(

select c# from sc

where s#='1001'

)

group by student.s#,

12、查询至少学过学号为“0001”同学所有一门课的其他同学学号和姓名；

Select sc.s#,sname from sc inner join student on sc.s#=student.s#

Where c# in (select c# from sc where s#=’0001’)

13、把“SC”表中“赵雁南”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,teacher,course

where sc.c#=course.c# and course.t#=teacher.t# and ='赵雁南')

where sc.c#=(select c# from course,teacher where course.t#=teacher.t# and tname='赵雁南' )

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 student.s#,sname from student,sc

where student.s#=sc.s# and sc.c#=all(select c# from sc where s#='1005') and student.s#<>'1005'

15、删除学习“朱玉文”老师课的SC表记录；

delete from sc

where c# in(select c# from sc where c# in (select c# from course,teacher where teacher.t#=course.t# and ='朱玉文' ) )

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“0002”课程的同学学号、号课的平均成绩；

insert into sc

values

select s# from sc where s# not in (select s# from sc where c#='0002'

select avg(score) as 平均成绩 from sc where c#='0002'

17、按平均成绩从高到低显示所有学生的“数据库”、“企业管理”、“英语”三门的课程成绩，按如下形式显示：学生ID,,数据库,企业管理,英语,有效课程数,有效平均分

select sc.s#,,,avg(score)as 平均成绩 from sc inner join course on sc.c#=course.c#

where sc.c# in(select c# from course where cname=any(select cname from course where cname in('计算机基础','Oracle','软件工程'))) group by sc.s#,,

order by avg(score) desc

SELECT S# as 学生ID

,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='0001') AS 计算机基础

,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='0002') AS Oracle

,(SELECT score FROM SC WHERE SC.S#=t.S# AND C#='0011') AS 软件工程

,COUNT(*) AS 有效课程数, AVG() AS 平均成绩

FROM sc AS t

GROUP BY S#

ORDER BY avg() desc

18、查询各科成绩最高和最低的分：以如下形式显示：课程ID，最高分，最低分

select c# 课程ID,max(score) 最高分,min(score) 最低分 from sc

group by c#

19、按各科平均成绩从低到高和及格率的百分数从高到低顺序

select c#, avg(score) from sc

where score>60

group by c#

20、查询如下课程平均成绩和及格率的百分数(用"1行"显示): 企业管理（），马克思（），OO&UML

21、查询不同老师所教不同课程平均分从高到低显示

select course.t#,avg() as 平均分 from sc,course

where sc.c#=course.c#

group by course.t#

order by avg() desc

22、查询如下课程成绩第3 名到第6 名的学生成绩单：企业管理，马克思，UML，数据库

[学生ID],[学生姓名],企业管理,马克思,UML,数据库,平均成绩

select student.s#,,, from student inner join sc on student.s#=sc.s#

inner join course on sc.c#=course.c#

where in('oracle','电路分析','计算机基础')

order by , desc

23、统计列印各科成绩,各分数段人数:课程ID,课程名称,[100-85],[85-70],[70-60],[ <60]

select sc.c#,,count(*)人数 from sc,course

where course.c#=sc.c#

group by sc.c#,

24、查询学生平均成绩及其名次

select sc.s#,avg(score) from sc

group by sc.s#

order by avg(score) desc

25、查询各科成绩前三名的记录考虑成绩并列情况

select s#,c# ,score from sc

where score in (

select distinct top 3 score from sc

group by c#,score

)

order by score desc

26、查询每门课程被选修的学生数

，数据库（）（）

select c# as 课程号,count(c#)as 选修人数 from sc

group by c#

order by count(c#) desc

27、查询出只选修了一门课程的全部学生的学号和姓名

select sc.s#, from sc inner join student on student.s#=sc.s#

group by sc.s#,

having count(c#)=1

28、查询男生、女生人数

select ssex, count(*) as 总人数 from student

group by ssex

29、查询姓“张”的学生名单

select sname from student

where sname like '张%'

30、查询同名同性学生名单，并统计同名人数

select ssex,count(*) from student

group by ssex

31、同年出生的学生名单(注：Student表中Sage列的类型是datetime)

32、查询每门课程的平均成绩，结果按平均成绩升序排列，平均成绩相同时，按课程号降序排列

select c#,avg(score)平均成绩 from sc

group by c#

order by avg(score) asc

33、查询平均成绩大于的所有学生的学号、姓名和平均成绩

select top 1 student.s#,,avg(score)平均成绩 from student inner join sc on student.s#=sc.s#

group by student.s#,

order by avg(score) desc

34、查询课程名称为“数据库”，且分数低于80的学生姓名和分数

select , from sc,student,course

where student.s#=sc.s# and sc.c#=course.c# and ='计算机基础' and <80

group by ,

35、查询所有学生的选课情况；

select student.s#,sname,c# from student left join sc on student.s#=sc.s#

36、查询任何一门课程成绩在70分以上的姓名、课程名称和分数；

select ,, from student,sc,course

where student.s#=sc.s# and sc.c#=course.c# and >70

order by score desc

37、查询不及格的课程，并按课程号从大到小排列

select c#,score from sc

where score<60

order by c#

38、查询课程编号为0001且课程成绩在70分以上的学生的学号和姓名；

select student.s#,sname from sc,student

where c#='0001' and score>70 and student.s#=sc.s#

39、求选了课程的学生人数

select count(s#)人数 from sc

where <>0

40、查询选修“oracle”课程的学生中，成绩最高的学生姓名及其成绩

select top 1 ,max()成绩最高 from student inner join sc on student.s#=sc.s# inner join course on

sc.c#=course.c# where ='oracle'

group by

order by max() desc

41、查询各个课程及相应的选修人数

select ,count(sc.c#) as 选修人数 from sc inner join course on sc.c#=course.c#

group by

order by count(sc.c#) desc, asc

42、查询不同课程成绩相同的学生的学号、课程号、学生成绩

43、查询每门功成绩最好的前两名

SELECT t1.S# as 学生ID,t1.C# as 课程ID,Score as 分数 FROM SC t1

WHERE score IN (SELECT TOP 2 score FROM SC

WHERE t1.C#= C#

ORDER BY score DESC

)

ORDER BY t1.C#

44、统计每门课程的学生选修人数（超过人的课程才统计）。要求输出课程号和选修人数，查询结果按人数降序排列，查询结果按人数降序排列，若人数相同，按课程号升序排列

45、检索至少选修两门课程的学生学号

select s#, count(s#) as 选修课程数 from sc

group by s#

having count(s#)>1

46、查询全部学生都选修的课程的课程号和课程名

select c#,cname from course

where c# in(select c# from sc)

47、查询没学过“叶平”老师讲授的任一门课程的学生姓名

select Sname from Student

where S# not in (

select S# from Course,Teacher,SC

where Course.T#=Teacher.T# and SC.C#=course.C# and Tname='朱玉文')

48、查询两门以上不及格课程的同学的学号及其平均成绩

49、检索“”课程分数小于，按分数降序排列的同学学号

select s#,score from sc

where score<60

order by score desc

50、删除“1005”同学的“0004”课程的成绩

delete from sc

where s#='1005' and c#='0004'