场景：学生管理系统
CREATE TABLE STUDENT
(SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATE,
SCLASS VARCHAR(5))
ENGINE=InnoDB DEFAULT CHARSET=utf8 ;
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)
ENGINE=InnoDB DEFAULT CHARSET=utf8 ;
CREATE TABLE COURSE
(CNO VARCHAR(5) NOT NULL,
CNAME VARCHAR(10) NOT NULL,
TNO VARCHAR(10) NOT NULL)
ENGINE=InnoDB DEFAULT CHARSET=utf8 ;
CREATE TABLE SCORE
(SNO VARCHAR(3) NOT NULL,
CNO VARCHAR(5) NOT NULL,
DEGREE NUMERIC(10, 1) NOT NULL)
ENGINE=InnoDB DEFAULT CHARSET=utf8 ;
ALTER TABLE student
ADD CONSTRAINT primary key (sno);
ALTER TABLE course
ADD constraint primary key (cno);
ALTER TABLE score
ADD constraint primary key (sno, cno);
ALTER TABLE teacher
ADD constraint primary key (tno);
ALTER TABLE course
ADD constraint foreign key (tno) references teacher (tno);
ALTER TABLE score
ADD constraint foreign key (cno) references course (cno);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (108 ,‘曾华’
,‘男’ ,‘1977-09-01’,95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (105 ,‘匡明’
,‘男’ ,‘1975-10-02’,95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (107 ,‘王丽’
,‘女’ ,‘1976-01-23’,95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (101 ,‘李军’
,‘男’ ,‘1976-02-20’,95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (109 ,‘王芳’
,‘女’ ,‘1975-02-10’,95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,SCLASS) VALUES (103 ,‘陆君’
,‘男’ ,‘1974-06-03’,95031);
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’);
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’,831);
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,‘6-166’,79);
INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (108,‘6-166’,81);
题目：
1、 查询Student表中的所有记录的Sname、Ssex和Class列。
select sname,ssex,sclass 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 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Class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 degree desc cno asc;
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。
select sno,cno from score where degree=(select max(degree) from score);
11、 查询‘3-105’号课程的平均分。
select avg(degree) from score where cno=‘3-105’;
12、 查询Score表中至少有5名学生选修并以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 where degree between 70 and 90;
14、 查询所有学生的Sname、Cno和Degree列。
select s.sname,c.cno,c.degree from student as s join score as c on s.sno=c.sno;
15、 查询所有学生的Sno、Cname和Degree列。
select s.sno,o.cname,c.degree from student as s join score as s on s.sno=c.sno
join course as o on o.cno=c.cno;
16、 查询所有学生的Sname、Cname和Degree列。
select s.sname,o.cname,c.degree from student as s join score as s on s.sno=c.sno
join course as o on o.cno=c.cno;
17、 查询“95033”班所选课程的平均分。
select avg(degree) from student as s join score as c on s.sno=c.sno where s.sclass=‘95033’;
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。
18、 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 as s join score as c on s.sno=c.sno where c.cno=‘3-105’ and c.degree>(select degree from score sno=109);
19、 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 s.sno,c.cno,c.degree from score as c,(select sno,max(degree) as degree from score group by sno having count(sno)>1 )as s where s.sno=c.sno and c.degree<s.degree;
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 student as s join score as c on s.sno=c.sno where c.cno=‘3-105’ and c.degree>(select degree from score sno=109);
21、 查询和学号为108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)=(select year(birthday) from student where sno=108);
22、 查询“张旭“教师任课的学生成绩。
select degree from teacher as t join course as c on t.tno=c.tno join score as o on o.cno=c.cno where t.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 sno having count()>5));
24、 查询95033班和95031班全体学生的记录。
select * from student where sclass=95033 or sclass=95031;
25、 查询存在有85分以上成绩的课程Cno.
select 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 degree from score where cno in(select cno from course where tno in(select tno from teacher where depart=‘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 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 sno,cno,degree from score where cno='3-105’and degree>(select max(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 sno,cno,degree from score where cno='3-105’and degree>(select max(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 s.sname,s.ssex,s.sbirthday,t.tname,t.tsex,t.tbirthday from student as s join score as o on s.sno=o.sno join course as c on o.cno=c.cno join teacher as t on t.tno=c.tno;
32、查询所有“女”教师和“女”同学的name、sex和birthday.
select s.sname,s.ssex,s.sbirthday,t.tname,t.tsex,t.tbirthday from student as s join score as o on s.sno=o.sno join course as c on o.cno=c.cno join teacher as t on t.tno=c.tno where s.ssex=‘女’ and t.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 as s where s.degree between 0 and(
select avg(degree) from score as c where s.cno=c.cno );
34、查询所有任课教师的Tname和Depart.
select tname,depart from teacher;
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 course);
36、查询至少有2名男生的班号。
select sclass from student where ssex=‘男’ group by ssex having count(ssex)>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。
39、查询Student表中最大和最小的Sbirthday日期值。
select max(sbirthday),min(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 * from student order by sclass desc,sbirthday asc;
41、查询“男”教师及其所上的课程。
select t.tname,t.tsex,c.cname from teacher as t join course as c on t.tno=c.tno 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 in(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 in(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 in(select ssex from student where sname=‘李军’) and sclass in(select sclass 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 Sno in (select Sno from student where Ssex=‘男’) and Cno in (select Cno from Course where Cname=‘计算机导论’);