mysql 练习题（一）

目录

一、数据表建立

二、习题答案

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题目概览

1、 查询Student表中的所有记录的Sname、Ssex和Class列。
2、 查询教师所有的单位即不重复的Depart列。
3、 查询Student表的所有记录。
4、 查询Score表中成绩在60到80之间的所有记录。
5、 查询Score表中成绩为85，86或88的记录。
6、 查询Student表中“95031”班或性别为“女”的同学记录。
7、 以Class降序查询Student表的所有记录。
8、 以Cno升序、Degree降序查询Score表的所有记录。
9、 查询“95031”班的学生人数。
10、查询Score表中的最高分的学生学号和课程号。
11、查询‘3-105’号课程的平均分。
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。
13、查询最低分大于70，最高分小于90的Sno列。
14、查询所有学生的Sname、Cno和Degree列。
15、查询所有学生的Sno、Cname和Degree列。
16、查询所有学生的Sname、Cname和Degree列。
17、查询“95033”班所选课程的平均分。
18、假设使用如下命令建立了一个grade表：
create table grade(low   number(3,0),upp number(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’);
commit;
现查询所有同学的Sno、Cno和rank列。
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。
20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录。
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。
22、查询和学号为107的同学同年出生的所有学生的Sno、Sname和Sbirthday列。
23、查询“张旭“教师任课的学生成绩。
24、查询选修某课程的同学人数多于5人的教师姓名。
25、查询95033班和95031班全体学生的记录。
26、查询存在有85分以上成绩的课程Cno.
27、查询出“计算机系“教师所教课程的成绩表。
28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。
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。
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.
31、查询所有教师和同学的name、sex和birthday.
32、查询所有“女”教师和“女”同学的name、sex和birthday.
33、查询成绩比该课程平均成绩低的同学的成绩表。
34、查询所有任课教师的Tname和Depart.
35  查询所有未讲课的教师的Tname和Depart. 
36、查询至少有2名男生的班号。
37、查询Student表中不姓“王”的同学记录。
38、查询Student表中每个学生的姓名和年龄。
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。
41、查询“男”教师及其所上的课程。
42、查询最高分同学的Sno、Cno和Degree列。
43、查询和“李军”同性别的所有同学的Sname.
44、查询和“李军”同性别并同班的同学Sname.
45、查询所有选修“计算机导论”课程的“男”同学的成绩表

 

一、数据表建立

 

 

# 1. 创建数据库student：
drop database if exists student;
create database if not exists Student;

show databases;
use Student ;


# 2. 创建表 student, course, score,teacher：
CREATE TABLE STUDENT
(SNO VARCHAR(3) NOT NULL, 
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL, 
SBIRTHDAY DATETIME,
CLASS VARCHAR(5));


CREATE TABLE COURSE
(CNO VARCHAR(5) NOT NULL, 
CNAME VARCHAR(10) NOT NULL, 
TNO VARCHAR(10) NOT NULL);


CREATE TABLE SCORE 
(SNO VARCHAR(3) NOT NULL, 
CNO VARCHAR(5) NOT NULL, 
DEGREE NUMERIC(10, 1) NOT NULL);


CREATE TABLE TEACHER 
(TNO VARCHAR(3) NOT NULL, 
TNAME VARCHAR(4) NOT NULL, TSEX VARCHAR(2) NOT NULL, 
TBIRTHDAY DATETIME NOT NULL, PROF VARCHAR(6), 
DEPART VARCHAR(10) NOT NULL);



# 3. 插入数据：
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,'曾华' 
,'男' ,'1977-09-01',95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (105 ,'匡明' 
,'男' ,'1975-10-02',95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (107 ,'王丽' 
,'女' ,'1976-01-23',95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,'李军' 
,'男' ,'1976-02-20',95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (109 ,'王芳' 
,'女' ,'1975-02-10',95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (103 ,'陆君' 
,'男' ,'1974-06-03',95031);


INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('3-105' ,'计算机导论',825);
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('3-245' ,'操作系统' ,804);
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('6-166' ,'数据电路' ,856);
INSERT INTO COURSE(CNO,CNAME,TNO)VALUES ('9-888' ,'高等数学' ,100);


INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (103,'3-245',86);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (105,'3-245',75);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (109,'3-245',68);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (103,'3-105',92);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (105,'3-105',88);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (109,'3-105',76);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (101,'3-105',64);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (107,'3-105',91);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (108,'3-105',78);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (101,'6-166',85);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (107,'6-106',79);
INSERT INTO SCORE(SNO,CNO,DEGREE)VALUES (108,'6-166',81);


INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) 
VALUES (804,'李诚','男','1958-12-02','副教授','计算机系');
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) 
VALUES (856,'张旭','男','1969-03-12','讲师','电子工程系');
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART)
VALUES (825,'王萍','女','1972-05-05','助教','计算机系');
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) 
VALUES (831,'刘冰','女','1977-08-14','助教','电子工程系');



# 4. 查询表， 检查数据插入正确：
select * from student;

select * from course;

select * from score;

# 去重查询：
select distinct * from teacher;  


alter table score drop id ;
# 增加自增列
alter table score add id int key auto_increment  first ;


# 关闭safe-updates模式
set sql_safe_updates=0;
 delete from score where sno ='120'  or sno='122';
# 开启safe-updates模式，防止误删数据
set global sql_safe_updates=1;


# sql 存储过程简单示例 
 delimiter //   
create procedure procedureTest(
    in sc int,  
    out min decimal(8,2), 
    out avg decimal(8,2),    
    out max decimal(8,2)
)
begin
    select min(DEGREE) into min from score; 
    select avg(DEGREE) into avg from score; 
    select max(DEGREE) into max from score; 
    select * from score where DEGREE>sc;
end//
delimiter 


# 调用存储过程
call procedureTest(90,@min,@avg,@max);
select @min, @avg, @max; 

# 删除存储过程
drop procedure if exists procedureTest;

 

二、习题答案

use student;

#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;

#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 order by class 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(*) 人数 from student where class='95031';

#10 查询Score表中的最高分的学生学号和课程号
select SNO,CNO from score where DEGREE=(select max(DEGREE) from score);

select SNO 学号,CNO 课程号 from score order by DEGREE desc limit 1;

#11 查询‘3-105’号课程的平均分。
select avg(degree) '3-105平均分' from score where CNO='3-105';

#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(sno)>=5;

#13、查询最低分大于70，最高分小于90的Sno列。
select SNO from score group by SNO having min(DEGREE)>70 and max(DEGREE)<90;

#14、查询所有学生的Sname、Cno和Degree列。
select sname,cno,degree from student a,score b where a.SNO=b.SNO order by sname desc;

SELECT A.SNAME,B.CNO,B.DEGREE FROM STUDENT AS A 
	JOIN SCORE AS B ON A.SNO=B.SNO;

#15、查询所有学生的Sno、Cname和Degree列。
select SNO,CNAME,DEGREE from score a,course b where a.CNO=b.CNO;

select SNO,CNAME,DEGREE from score as a 
	inner join course as b on a.cno=b.cno;

#16、查询所有学生的Sname、Cname和Degree列。
select a.SNAME,c.CNAME,b.DEGREE from student as a 
	inner join score as b on a.SNO=b.SNO
	inner join course as c on b.cno=c.cno;

select a.SNAME,c.CNAME,b.DEGREE from student as a 
	inner join (score b,course c) on a.SNO=b.SNO and b.cno=c.cno;

#17、查询“95033”班所选课程的平均分。
select b.CLASS,avg(a.DEGREE),a.cno from score as a 
	join student as b on a.SNO=b.SNO where b.CLASS = '95033'
    group by a.cno;

/*18、假设使用如下命令建立了一个grade表：
drop table grade;
create table grade(low NUMERIC(3, 0),upp NUMERIC(3, 0),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');
commit;
现查询所有同学的Sno、Cno和rank列。
*/
select a.sno,a.cno,b.rank,c.sname from score as a 
	join grade as b on a.DEGREE between b.low and b.upp
	join student as c on a.SNO=c.SNO
    order by rank;

#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 a.* from score a where a.CNO='3-105' and 
	a.DEGREE>all(select DEGREE from score b where b.sno='109' and b.cno= '3-105');
    
select a.* from score as a 
	inner join score as b where a.CNO='3-105' and a.DEGREE>b.DEGREE and b.sno='109' and b.cno= '3-105';

#20、查询score中选学一门以上课程的同学中分数为非最高分成绩的记录。
select * from score s
	where s.DEGREE<(select max(degree) from score)
    group by sno
    having count(sno)>1
    order by DEGREE ;

#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 as a where a.CNO='3-105' and
	a.DEGREE>all(select DEGREE from score b where b.SNO='109' and b.CNO='3-105');

#22、查询和学号为107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)=all(select year(SBIRTHDAY) from student where sno='107');

#23、查询“张旭“教师任课的学生成绩。
select a.SNO,a.DEGREE from score as a
	inner join course as b on a.CNO=b.CNO
	inner join teacher as c on c.TNO=b.TNO where c.TNAME='张旭';
    
select a.SNO,a.DEGREE from score as a
	join (course b,teacher c) on a.CNO=b.CNO and c.TNO=b.TNO where c.TNAME='张旭';
    
select sno,degree from score where cno=(select x.cno from course x,teacher y 
	where x.tno=y.tno and y.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 a.tname  from teacher a 
	join (course b,score c ) on a.TNO=b.TNO and b.CNO=c.CNO
    group by c.cno 
    having count(c.sno)>5;
    
select tname from  teacher where TNO in (select c.TNO from course c, score s 
	where c.CNO=s.CNO group by s.CNO having count(s.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' order by CLASS;

#26、查询存在有85分以上成绩的课程Cno.
select distinct cno from score where DEGREE>85;

select cno from score group by CNO having Max(DEGREE)>85;

#27、查询出“计算机系“教师所教课程的成绩表。
select a.* from score a
	join (teacher b,course c) on a.CNO=c.CNO and b.TNO=c.TNO
    where b.DEPART='计算机系';
    
select * from score where cno in (
	select b.cno from teacher a join course b on a.TNO=b.TNO and a.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='计算机系' and PROF not in (
	select PROF from teacher where DEPART='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 * from score where CNO='3-105' and DEGREE>ANY(
	select DEGREE from score where CNO='3-245')
    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 * from score where CNO='3-105' and DEGREE>all(
	select DEGREE from score where CNO='3-245')
    order by DEGREE desc;

#31、查询所有教师和同学的name、sex和birthday.
select tname as Name,tsex as Sex,TBIRTHDAY as BIRTHDAY from teacher  
	union all select SNAME as Name,SSEX as Sex,SBIRTHDAY as BIRTHDAY from student;

#32、查询所有“女”教师和“女”同学的name、sex和birthday.
select tname as Name,tsex as Sex,TBIRTHDAY as BIRTHDAY from teacher  where TSEX='女'
	union all select SNAME as Name,SSEX as Sex,SBIRTHDAY as BIRTHDAY from student where SSEX='女';

#33、查询成绩比该课程平均成绩低的同学的成绩表。
select a.* from score as a where DEGREE<(select avg(DEGREE) from score b where a.CNO=b.cno);

SELECT A.* FROM SCORE AS A, (SELECT CNO, AVG(DEGREE) AS AVGDEGREE FROM SCORE GROUP BY CNO) AS B 
WHERE A.CNO=B.CNO AND A.DEGREE1;

#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,(year(now())-year(SBIRTHDAY)) as age from student;

#39、查询Student表中最大和最小的Sbirthday日期值。
select sname,sbirthday  from student where 
	sbirthday =(select min(SBIRTHDAY) from student)
	union
	select sname,sbirthday from student where 
    sbirthday =(select max(SBIRTHDAY) from student);
    
#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 student.*,(year(now())-year(SBIRTHDAY)) as age from student
	order by CLASS desc,age desc;

#41、查询“男”教师及其所上的课程。
select a.TNAME,a.TSEX,b.CNAME from teacher a 
	 join course b using(TNO) where a.TSEX='男' ;
     
select a.TNAME,a.TSEX,b.CNAME from teacher as a 
	 inner join course as b on a.TNO=b.TNO where a.TSEX='男' ;
	
#42、查询最高分同学的Sno、Cno和Degree列。
select * 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 a where a.SSEX=(
	select ssex from student b where b.SNAME='李军');

#44、查询和“李军”同性别并同班的同学Sname.
select a.SNAME from student as a,(
	select * from student b where b.SNAME='李军') as b
	where a.SSEX=b.SSEX and a.CLASS=b.CLASS and a.SNAME <> '李军';

SELECT SNAME FROM STUDENT A WHERE SSEX=(SELECT SSEX FROM STUDENT B WHERE B.SNAME='李军' )
AND CLASS=(SELECT CLASS FROM STUDENT C WHERE c.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 a.* from score as a
	inner join (course b, student c) on a.CNO=b.CNO and a.SNO=c.SNO
    and b.CNAME='计算机导论' and c.SSEX='男';

select a.* from score as a
	inner join (course b, student c) using(CNO,SNO)
    where b.CNAME='计算机导论' and c.SSEX='男';
    
select * from score where sno in(
	select sno from student where ssex='男') 
    and cno=(select cno from course where cname='计算机导论');