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MySQL查询语句试题

2020-06-11 20:06:14 阅读：244 来源： 互联网

标签：语句试题 degree score student MySQL cno WHERE SELECT

创建学生信息表：

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)
);

创建老师信息表：
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
);

创建课程表：
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)
);

创建课程表：
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
);

添加数据：
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');

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');

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');

alter table score drop primary key;

创建成绩表：
CREATE TABLE `score` (
`sno` varchar(20) NOT NULL,
`cno` varchar(20) NOT NULL,
`degree` decimal(10,0) DEFAULT NULL,
PRIMARY KEY (`sno`,`cno`),
KEY `cno` (`cno`),
CONSTRAINT `score_ibfk_1` FOREIGN KEY (`sno`) REFERENCES `student` (`sno`),
CONSTRAINT `score_ibfk_2` FOREIGN KEY (`cno`) REFERENCES `course` (`cno`)
)
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('101','3-105','64');
insert into score values('107','3-105','91');
insert into score values('108','3-105','78');
insert into score values('101','6-166','85');
insert into score values('107','6-166','79');
insert into score values('108','6-166','81');

1、查询Student表中的所有记录的Sname、Ssex和Class列。

SELECT Sname,Ssex,Class FROM student;

2、查询教师所有的单位即不重复的Depart列。

SELECT DISTINCT depart FROM teacher;

3、查询Student表的所有记录。

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;
SELECT * FROM score WHERE degree >= 60 AND degree <= 80;

5、查询Score表中成绩为85，86或88的记录。

SELECT * FROM score WHERE degree=85 or degree=86 or degree=88;
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 class='95031' or ssex='女';

7、以Class降序查询Student表的所有记录。

SELECT * from student WHERE class order by class DESC;

8、以Cno升序、Degree降序查询Score表的所有记录。

SELECT * from score WHERE class order by cno ASC,degree DESC;

9、查询“95031”班的学生人数。

SELECT COUNT(*) FROM student WHERE class="95031";
SELECT class,COUNT(sno) FROM student WHERE class="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）

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

13、查询分数大于70，小于90的Sno列。

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

14、查询所有学生的Sname、Cno和Degree列。

SELECT sname,cno,degree FROM student INNER 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 INNER JOIN score ON course.cno=score.cno;

16、查询所有学生的Sname、Cname和Degree列。

SELECT student.sname,sourse.cname,score.degree FROM student,course,score
WHERE student.sno=score.sno AND score.cno=course.cno;

17、查询“95033”班学生的平均分。

SELECT AVG(degree) FROM score WHERE sno in(SELECT sno FROM student WHERE class="95033");
SELECT AVG(degree) FROM student,score WHERE student.sno = score.sno AND student.class=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;

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

20、选了多门课程并且是这个课程下不是最高分的

/*SELECT * FROM score WHERE sno in
(SELECT sno FROM score GROUP BY sno HAVING COUNT(sno) > 1)
AND degree not in (SELECT MAX(degree) FROM score GROUP BY cno);

SELECT * from score sc
LEFT JOIN(SELECT cno,max(degree) as max from score GROUP by cno) sc1 on sc.cno = sc1.cno
where sc.degree < max
and SNO IN (SELECT SNO FROM SCORE GROUP BY SNO HAVING COUNT(SNO) > 1);

SELECT * FROM score a
WHERE SNO IN (SELECT SNO FROM SCORE GROUP BY SNO HAVING COUNT(SNO) > 1)
and degree<(select max(degree) from score b WHERE a.cno=b.cno);

21、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');

23、查询“张旭“教师任课的学生成绩。

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

24、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 = (SELECT tno FROM course WHERE
cno = (SELECT cno FROM score GROUP BY cno HAVING COUNT(sno)>5));

25、查询95033班和95031班全体学生的记录。

SELECT * FROM student WHERE class ='95033' OR class = '95031';
SELECT * FROM student WHERE class in (95033,95031);

26、查询存在有85分以上成绩的课程Cno。
SELECT cno FROM score WHERE degree in(SELECT degree from score WHERE degree > 85);

SELECT cno FROM score GROUP BY degree HAVING degree > 85;

27、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 depart = '计算机系'));

28、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 depart in ('计算机系','电子工程系');*/

/*29、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 a WHERE
(SELECT degree FROM score b WHERE cno = '3-105' AND b.Sno=a.Sno)>=
(SELECT degree FROM score c WHERE cno = '3-245' and c.Sno=a.Sno) ORDER BY degree DESC;

30、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 a WHERE
(SELECT degree FROM score b WHERE cno = '3-105' AND b.Sno=a.Sno)>=
(SELECT degree FROM score c WHERE cno = '3-245' and c.Sno=a.Sno);

31、查询所有教师和同学的name、sex和birthday。
1/SELECT sname name,ssex sex,sbirthday birthday FROM student UNION SELECT tname name,tsex sex,tbirthday birthday FROM teacher;

2/select distinct sname as name,ssex as sex,sbirthday as birthday from student
union
select distinct tname as name,tsex as sex,tbirthday as birthday from teacher

32、查询所有“女”教师和“女”同学的name、sex和birthday。

SELECT sname name,ssex sex,sbirthday birthday FROM student WHERE ssex = '女'
UNION
SELECT tname name,tsex sex,tbirthday birthday FROM teacher WHERE tsex = '女';

33、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
degree < (SELECT AVG(degree) FROM score b WHERE a.cno=b.cno);

34、查询所有任课教师的Tname和Depart。
SELECT tname,depart FROM teacher WHERE tno in
(SELECT tno from score,course WHERE score.cno = course.cno GROUP BY score.cno)

35 、查询所有未讲课的教师的Tname和Depart。
SELECT tname,depart FROM teacher WHERE tno NOT in
(SELECT tno from score,course WHERE score.cno = course.cno GROUP BY score.cno)

36、查询至少有2名男生的班号。

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

37、查询Student表中不姓“王”的同学记录。

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

38、查询Student表中每个学生的姓名和年龄。
SELECT sname AS 姓名,sbirthday AS 年龄 FROM student;

39、查询Student表中最大和最小的Sbirthday日期值。

40、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 class DESC,(year(now())-sbirthday) DESC;

41、查询“男”教师及其所上的课程。
SELECT cname from course WHERE tno in (SELECT tno FROM teacher WHERE tsex = '男');

42、查询最高分同学的Sno、Cno和Degree列。
SELECT sno,cno,degree FROM score WHERE degree =(SELECT MAX(degree) FROM score);

43、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');

44、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 sno in
(SELECT sno FROM student WHERE
class in(SELECT class FROM student WHERE sname = '李军'));

45、查询所有选修“计算机导论”课程的“男”同学的成绩表。

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

标签：语句,试题,degree,score,student,MySQL,cno,WHERE,SELECT
来源： https://www.cnblogs.com/blog-apply/p/13095685.html

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MySQL查询语句试题