mysql查询语句练习题

设有一数据库，包括四个表：学生表（Student）、课程表（Course）、成绩表（Score）以及教师信息表（Teacher）。
四个表的结构分别如下所示。

表（一）Student (学生表）：

属性名	数据类型	可否为空	含义
Sno	varchar (20)	否	学号（主码）
Sname	varchar (20)	否	学生姓名
Ssex	varchar (20)	否	学生性别
Sbirthday	datetime	可	学生出生年月
Sclass	varchar (20)	可	学生所在班级

表（二）Teacher(教师表)：

属性名	数据类型	可否为空	含义
Tno	varchar (20)	否	教工编号（主码）
Tname	varchar (20)	否	教工姓名
Tsex	varchar (20)	否	教工性别
Tbirthday	datetime	可	教工出生年月
Prof	varchar (20)	可	职称
Department	varchar (20)	否	教工所在部门

表（三）Course（课程表）：

属性名	数据类型	可否为空	含义
Cno	varchar (20)	否	课程号（主码）
Cname	varchar (20)	否	课程名称
Tno	varchar (20)	否	教工编号（外码）

表（四）Score(成绩表)：

属性名	数据类型	可否为空	含义
Sno	varchar (20)	否	学号（外码））
Cno	varchar (20)	否	课程号（外码）
Degree	Decimal(4,1)	可	成绩

数据库中的数据：
表Student:

Sno	Sname	Ssex	Sbirthday	Sclass
108	曾华	男	1977-09-01	95033
105	匡明	男	1975-10-02	95031
107	王丽	女	1976-01-23	95033
101	李军	男	1976-02-20	95033
109	王芳	女	1975-02-10	95031
103	陆君	男	1974-06-03	95031

表Teacher:

Tno	Tname	Tsex	Sbirthday	Sclass
804	李诚	男	1958-12-02	副教授
856	张旭	男	1969-03-12	讲师
825	王萍	女	1972-05-05	助教
831	刘冰	女	1977-08-14	助教

表Course:

Cno	Cname	Tno
3-105	计算机导论	825
3-245	操作系统	804
6-166	数字电路	856
9-888	高等数学	831

表Score:

Sno	Cno	Degree
103	3-245	86
105	3-245	75
109	3-245	68
103	3-105	92
105	3-105	88
109	3-105	76
101	3-105	64
107	3-105	91
108	3-105	78
101	6-166	85
107	6-166	79
108	6-166	81

用SQL创建四个表并完成相关题目。

#建立学生表
create table student(
sno varchar(20) not null primary key,
sname varchar(20) not null,
ssex varchar(20) not null,
sbirthday datetime,
class varchar(20)
);
#建立教师表
create table teacher
(
tno varchar(20) not null primary key,
tname varchar(20) not null,
tsex varchar(20) not null,
tbirthday datetime,
prof varchar(20),
depart varchar(20) not null
);
#建立课程表
create table course
(
cno varchar(20) not null primary key,
cname varchar(20) not null,
tno varchar(20) not null,
foreign key(tno) references teacher(tno)
);
#建立成绩表
create table score
(
sno varchar(20) not null primary key,
foreign key(sno) references student(sno),
cno varchar(20) not null,
foreign key(cno) references course(cno),
degree decimal
);
#添加学生信息
insert into student values('108','曾华','男','1977-09-01','95033');
insert into student values('105','匡明','男','1975-10-02','95031');
insert into student values('107','王丽','女','1976-01-23','95033');
insert into student values('101','李军','男','1976-02-20','95033');
insert into student values('109','王芳','女','1975-02-10','95031');
insert into student values('103','陆君','男','1974-06-03','95031');
#添加教师信息
insert into teacher values('804','李诚','男','1958-12-02','副教授','计算机系');
insert into teacher values('856','张旭','男','1969-03-12','讲师','电子工程系');
insert into teacher values('825','王萍','女','1972-05-05','助教','计算机系');
insert into teacher values('831','刘冰','女','1977-08-14','助教','电子工程系');
#添加课程信息
insert into course values('3-105','计算机导论','825');
insert into course values('3-245','操作系统','804');
insert into course values('6-166','数字电路','856');
insert into course values('9-888','高等数学','831');
#添加成绩信息
insert into score values('103','3-245','86');
insert into score values('105','3-245','75');
insert into score values('109','3-245','68');
insert into score values('103','3-105','92');
insert into score values('105','3-105','88');
insert into score values('109','3-105','76');
insert into score values('103','3-105','64');
insert into score values('105','3-105','91');
insert into score values('109','3-105','78');
insert into score values('103','6-166','85');
insert into score values('105','6-166','79');
insert into score values('109','6-166','81');

1.查询STUDENT表中所有记录的Sname、ssex、sclass列

SELECT sname,ssex,sclass FROM student;

2.查询教师所有单位（即不重复的department）

SELECT DISTINCT department FROM teacher;

3.查询student表中所有记录

SELECT * FROM student;

4.查询score表中成绩在60到80之间的所有记录

SELECT * FROM score WHERE degree BETWEEN 60 AND 80;

5.查询score中成绩为85，86或88的记录

SELECT * FROM score WHERE degree IN (85,86,88);

6.查询student表中“95031”班或性别为“女”的同学记录

SELECT * FROM student WHERE sclass='95031' OR ssex='女';

7.以sclass降序查询student表的所有记录

SELECT * FROM student ORDER BY sclass DESC;

8.以cno升序、degree降序查询score表的所有记录

SELECT * FROM score ORDER BY cno ASC,degree DESC;

9.查询“95031”班的学生人数

SELECT COUNT(*) FROM student WHERE sclass='95031';

10.查询Score表中的最高分的学生学号和课程号。（子查询或者排序）

#子查询
SELECT sno,cno FROM score WHERE degree = (SELECT MAX(degree) FROM score);
#排序
SELECT sno,cno FROM score ORDER BY degree DESC LIMIT 0,1;

11.查询每门课的平均成绩

SELECT cno,AVG(degree) FROM score GROUP BY cno;

12.查询Score表中至少有5名学生选修的并以3开头的课程的平均分数。

SELECT cno,AVG(degree) FROM score WHERE cno LIKE '3%' GROUP BY cno HAVING COUNT(*)>= 5;

SELECT AVG(degree) FROM score WHERE cno LIKE'3%' AND cno IN (SELECT cno FROM score GROUP BY cno HAVING COUNT(sno)>=5);

13.查询分数大于70，小于90的Sno列。

SELECT sno FROM score WHERE degree BETWEEN 70 AND 90;

SELECT sno FROM score WHERE degree>70 AND degree<90;

14.查询所有学生的Sname、Cno和Degree列。

#多表查询
SELECT sname,cno,degree FROM student,score WHERE student.`Sno`=score.`Sno`;
#内连接
SELECT sname,cno,degree FROM student JOIN score ON student.`Sno`=score.`Sno`;

15.查询所有学生的Sno、Cname和Degree列。

SELECT sno,cname,degree FROM course,score WHERE score.`Cno`=course.`Cno`;

16.查询所有学生的Sname、Cname和Degree列。

SELECT sname,cname,degree FROM student,course,score WHERE student.`Sno`=score.`Sno` AND course.`Cno`=score.`Cno`;

17.查询“95033”班学生的平均分。

#多表查询
#where、子查询、内连接
SELECT AVG(degree) FROM score,student WHERE student.`Sno`=score.`Sno` AND sclass='95033';

SELECT AVG(degree) FROM score WHERE sno IN (SELECT sno FROM student WHERE sclass='95033');

SELECT AVG(degree) FROM score JOIN student ON score.`Sno`=student.`Sno`  WHERE sclass='95033';

18.假设使用如下命令建立了一个grade表：
create table grade(low int(3),upp int(3),rank char(1))
insert into grade values(90,100,’A’)
insert into grade values(80,89,’B’)
insert into grade values(70,79,’C’)
insert into grade values(60,69,’D’)
insert into grade values(0,59,’E’)
现查询所有同学的Sno、Cno和rank列。

SELECT sno,cno,rank FROM score,grade WHERE degree BETWEEN low AND upp;

SELECT sno,cno,rank FROM score LEFT JOIN grade ON degree BETWEEN low AND upp;

19.查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。

SELECT * FROM score WHERE cno='3-105' AND degree>(SELECT degree FROM score WHERE sno='109'AND cno='3-105');

20.查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。

SELECT * FROM score WHERE degree>(SELECT degree FROM score WHERE sno='109' AND cno='3-105');

21.查询和学号为108、101的同学同年出生的所有学生的Sno、Sname和Sbirthday列。

SELECT sno,sname,sbirthday FROM student WHERE YEAR(sbirthday) IN (SELECT YEAR(sbirthday) FROM student WHERE sno IN (108,101));

22.查询“张旭“教师任课的学生成绩。

SELECT sno,degree FROM score WHERE cno IN (SELECT cno FROM course WHERE tno IN (SELECT tno FROM teacher WHERE tname='张旭'));

SELECT sno,degree FROM score,course,teacher WHERE score.`Cno`=course.`Cno` AND course.`Tno`=teacher.`Tno` AND tname='张旭';

SELECT sno,degree FROM score JOIN course ON score.`Cno`=course.`Cno` JOIN teacher ON course.`Tno`=teacher.`Tno` WHERE tname='张旭';

23.查询选修某课程的同学人数多于5人的教师姓名。

SELECT tname FROM teacher WHERE tno IN (SELECT tno FROM course WHERE cno IN (SELECT cno FROM score  GROUP BY cno HAVING COUNT(*)>5));

SELECT tname FROM teacher,course WHERE teacher.`Tno`=course.`Tno` AND cno IN (SELECT cno FROM score  GROUP BY cno HAVING COUNT(*)>5);

SELECT tname FROM teacher JOIN course ON teacher.`Tno`=course.`Tno` WHERE cno IN (SELECT cno FROM score  GROUP BY cno HAVING COUNT(*)>5);

24.查询95033班和95031班全体学生的记录。

SELECT * FROM student, scoree ,course WHERE student.`Sno`=score.`Sno` AND score.`Cno`=course.`Cno` AND sclass IN('95033','95031');

SELECT * FROM student s LEFT JOIN score sc ON s.sno =sc.sno LEFT JOIN course c ON sc.cno=c.cno AND sclass IN ('95033','95031');

25.查询存在有85分以上成绩的课程Cno。

SELECT DISTINCT cno FROM score WHERE degree>85;

26.查询出“计算机系“教师所教课程的成绩表。

SELECT * FROM score WHERE cno IN(SELECT cno FROM course WHERE tno IN(SELECT tno FROM teacher WHERE department='计算机系'));

SELECT score.`Cno`,score.`Sno`,score.`degree` FROM score,course,teacher WHERE score.cno=course.`Cno` AND course.`Tno`=teacher.`Tno` AND department='计算机系';

SELECT score.`Cno`,score.`Sno`,score.`degree` FROM score LEFT JOIN course ON score.`Cno`=course.`Cno` LEFT JOIN teacher ON course.`Tno`=teacher.`Tno` WHERE department='计算机系';

27.查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。

SELECT tname,prof FROM teacher WHERE prof NOT IN (SELECT prof FROM teacher WHERE department IN('计算机系','电子工程系') GROUP BY prof HAVING COUNT(*)>1);

SELECT tname,Prof FROM Teacher WHERE Prof NOT IN (SELECT Prof FROM Teacher WHERE Prof IN (SELECT Prof FROM Teacher WHERE department = '计算机系') AND Department = '电子工程系');

SELECT tname,prof FROM teacher WHERE department ='计算机系' AND prof NOT IN(SELECT prof FROM teacher WHERE department='电子工程系')
UNION SELECT tname,prof FROM teacher WHERE department ='电子工程系' AND prof NOT IN(SELECT prof FROM teacher WHERE department='计算机系');

28.查询选修编号为“3-105“课程且成绩至少高于选修编号为“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' AND degree >(SELECT MIN(degree) FROM score WHERE cno='3-245') ORDER BY degree DESC;

SELECT cno,sno,degree FROM score WHERE cno = '3-105' AND degree >ANY(SELECT degree FROM Score WHERE cno = '3-245') ORDER BY Degree DESC;

29.查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree。

SELECT cno,sno,degree FROM score WHERE cno='3-105' AND degree>(SELECT MAX(degree) FROM score WHERE cno='3-245');

SELECT cno,sno,degree FROM score WHERE cno = '3-105' AND degree >ALL(SELECT degree FROM Score WHERE cno='3-245');

1. 查询所有教师和同学的name、sex和birthday。

SELECT sname '姓名',ssex '性别',sbirthday '出生日期','学生' AS '职业' FROM student UNION SELECT tname '姓名',tsex '性别',tbirthday '出生日期','教师' AS '职业' FROM teacher;

31.查询所有“女”教师和“女”同学的name、sex和birthday。

SELECT sname '姓名',ssex '性别',sbirthday '出生日期','学生' AS '职业' FROM student WHERE ssex='女' UNION SELECT tname '姓名',tsex '性别',tbirthday '出生日期','教师' AS '职业' FROM teacher WHERE tsex='女';

32.查询成绩比该课程平均成绩低的同学的成绩表。

SELECT * FROM score a WHERE a.`degree`<(SELECT AVG(degree) FROM score b WHERE a.`Cno`=b.`Cno`);

33.查询所有任课教师的Tname和Department。

SELECT tname,department FROM teacher RIGHT JOIN course ON teacher.`Tno`=course.`Tno`;

34.查询所有未讲课的教师的Tname和Depart。

SELECT tname,department FROM teacher WHERE tno NOT IN (SELECT tno FROM course WHERE cno IN (SELECT cno FROM score));

35.查询至少有2名男生的班号。

SELECT sclass FROM student WHERE ssex='男'GROUP BY sclass HAVING COUNT(ssex)>=2;

36.查询Student表中不姓“王”的同学记录。

SELECT * FROM student WHERE sname NOT LIKE '王%';

37.查询Student表中每个学生的姓名和年龄。

SELECT sname,YEAR(NOW())-YEAR(sbirthday) 年龄 FROM student;

38.查询Student表中最大和最小的Sbirthday日期值。

SELECT MAX(sbirthday),MIN(sbirthday) FROM student;

39.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 sclass DESC,Sbirthday;

40.查询“男”教师及其所上的课程。

SELECT tname,cname FROM course RIGHT JOIN teacher ON teacher.`Tno`=course.`Tno` WHERE tsex='男';

41.查询最高分同学的Sno、Cno和Degree列。

SELECT * FROM score ORDER BY degree DESC LIMIT 0,1;

42.查询和“李军”同性别的所有同学的Sname。

SELECT sname FROM student WHERE ssex=(SELECT ssex FROM student WHERE sname='李军');

43.查询和“李军”同性别并同班的同学Sname。

SELECT sname FROM student WHERE ssex=(SELECT ssex FROM student WHERE sname='李军') AND sclass=(SELECT sclass FROM student WHERE sname='李军');

44.查询所有选修“计算机导论”课程的“男”同学的成绩表。

SELECT * FROM score WHERE cno=(SELECT cno FROM course WHERE cname='计算机导论') AND sno IN (SELECT sno FROM student WHERE ssex='男');

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