我复习的时候需要看的题：35、33、18
创建表并添加数据
- 学生信息表student
CREATE TABLE STUDENT
(
SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATETIME,
CLASS VARCHAR(5)
)- 课程信息表course
CREATE TABLE COURSE
(CNO VARCHAR(5) NOT NULL,
CNAME VARCHAR(10) NOT NULL,
TNO VARCHAR(10) NOT NULL)- 成绩表score
CREATE TABLE SCORE
(SNO VARCHAR(3) NOT NULL,
CNO VARCHAR(5) NOT NULL,
DEGREE NUMERIC(10, 1) NOT NULL)- 讲师表teacher
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)- 向表中添加数据
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');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 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 ssex='女' or class='95031';
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,degree desc;
9、 查询“95031”班的学生人数。
select count(*) 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 order by degree desc limit 0,1;
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名学生选修的并以3开头的课程的平均分数。
select cno,count(*),avg(DEGREE) from score where cno like '3%' group by cno having count(*)>=5
13、查询最低分大于70，最高分小于90的Sno列。
select * from score where DEGREE between 70 and 90;
14、查询所有学生的Sname、Cno和Degree列。
select s.sname,sc.cno,sc.DEGREE from score sc
inner join student s
on sc.sno=s.SNO
15、查询所有学生的Sno、Cname和Degree列。
select s.sno,c.cname,s.degree from course c
inner join score s
on c.cno=s.cno
16、查询所有学生的Sname、Cname和Degree列。
select st.sname,c.cname,s.degree from student st
inner join score s
inner join course c
on st.sno=s.sno and s.cno=c.cno;
17、查询“95033”班所选课程的平均分。
select avg(s.degree) from score s
inner join student st
on s.sno=st.sno
where st.class='95033'
18、假设使用如下命令建立了一个grade表，现查询所有同学的Sno、Cno和grank列
create table grade(low int(3),upp int(3),grank 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;select s.sno,s.cno,s.DEGREE,g.grank from score s
left join grade g
on s.DEGREE between g.low and g.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 max(DEGREE) from score where sno='109')
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。
-- 选择课程大于1的学生名单
select sno from score GROUP BY sno having count(*)>1;
-- 选出选课大于1的同学中的最高分
select max(degree) from score where sno
in(select sno from score GROUP BY sno having count(*)>1);
-- 选出选课大于1的同学中非最高分的所有学生记录
select * from score where DEGREE<(select max(degree) from score where sno
in(select sno from score GROUP BY sno having count(*)>1));
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 max(DEGREE) from score where sno='109' and cno='3-105')
22、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 * from student where year(sbirthday)=
(select year(sbirthday) from student where sno='108') and sno<>'108'
23、查询“张旭“教师任课的学生成绩。
select t.tname,c.cname,s.sname,sc.degree from course c
inner join teacher t
inner join student s
inner join score sc
on c.cno=sc.cno and sc.sno=s.sno and t.tno=c.tno
and t.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 t.tname,count(*) from course c
inner join teacher t
inner join student s
inner join score sc
on c.cno=sc.cno and sc.sno=s.sno and t.tno=c.tno
group by t.tname having count(*)>5;
25、查询95033班和95031班全体学生的记录。
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 distinct cno from score where DEGREE>85;
27、查询出“计算机系“教师所教课程的成绩表。
select t.tname,t.DEPART,c.cname,s.sname,sc.degree from course c
inner join teacher t
inner join student s
inner join score sc
on c.cno=sc.cno and sc.sno=s.sno and t.tno=c.tno
and t.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 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 cno,sno,degree from score where cno='3-105' and degree>
(select min(degree) from score where cno='3-245')
31、查询所有教师和同学的name、sex和birthday.
select tname name,tsex sex,tbirthday birthday from teacher
union ALL
SELECT sname,ssex,sbirthday from student
32、查询所有“女”教师和“女”同学的name、sex和birthday.
select tname name,tsex sex,tbirthday birthday from teacher where tsex='女'
union ALL
SELECT sname,ssex,sbirthday 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 * from score s1 where degree < (select avg(degree) from score s2 GROUP BY s2.cno having s1.cno=s2.cno);
select cno,avg(degree) from score GROUP BY 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 t where t.tno not in
(select tno from course)
-- 或者
select tname,depart from teacher t where
not exists (select t.tno from course c where t.tno=c.tno)
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,(year(now())-year(sbirthday)) age from student
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 class desc,(year(now())-year(sbirthday)) desc;
41、查询“男”教师及其所上的课程。
select t.TNAME,t.TSEX,c.cname from teacher t
inner join course c
on t.tno=c.TNO
where t.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 class=(select class from student where sname='李军') and 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 * from score sc
inner JOIN student s
inner join course c
on c.cno=sc.cno and s.sno=sc.SNO
where c.cname='计算机导论' and s.ssex='男'