show databases ; create database newTest; use newTest; CREATE TABLE STUDENTS (sno VARCHAR(3) NOT NULL, sname VARCHAR(4) NOT NULL, ssex VARCHAR(2) NOT NULL, sbirthday DATETIME, class VARCHAR(5)); CREATE TABLE COURSES (cno VARCHAR(5) NOT NULL, cname VARCHAR(10) NOT NULL, tno VARCHAR(10) NOT NULL); CREATE TABLE SCORES (sno VARCHAR(3) NOT NULL, cno VARCHAR(5) NOT NULL, degree NUMERIC(10, 1) NOT NULL); CREATE TABLE TEACHERS (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); INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,‘曾华’ ,‘男’ ,‘1977-09-01’,95033); INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (105 ,‘匡明’ ,‘男’ ,‘1975-10-02’,95031); INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (107 ,‘王丽’ ,‘女’ ,‘1976-01-23’,95033); INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,‘李军’ ,‘男’ ,‘1976-02-20’,95033); INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (109 ,‘王芳’ ,‘女’ ,‘1975-02-10’,95031); INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (103 ,‘陆君’ ,‘男’ ,‘1974-06-03’,95031); INSERT INTO COURSES(CNO,CNAME,TNO)VALUES (‘3-105’ ,‘计算机导论’,825); INSERT INTO COURSES(CNO,CNAME,TNO)VALUES (‘3-245’ ,‘操作系统’ ,804); INSERT INTO COURSES(CNO,CNAME,TNO)VALUES (‘6-166’ ,‘数据电路’ ,856); INSERT INTO COURSES(CNO,CNAME,TNO)VALUES (‘9-888’ ,‘高等数学’ ,100); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (103,‘3-245’,86); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (105,‘3-245’,75); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (109,‘3-245’,68); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (103,‘3-105’,92); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (105,‘3-105’,88); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (109,‘3-105’,76); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (101,‘3-105’,64); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (107,‘3-105’,91); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (108,‘3-105’,78); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (101,‘6-166’,85); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (107,‘6-106’,79); INSERT INTO SCORES(SNO,CNO,DEGREE)VALUES (108,‘6-166’,81); INSERT INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (804,‘李诚’,‘男’,‘1958-12-02’,‘副教授’,‘计算机系’); INSERT INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (856,‘张旭’,‘男’,‘1969-03-12’,‘讲师’,‘电子工程系’); INSERT INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (825,‘王萍’,‘女’,‘1972-05-05’,‘助教’,‘计算机系’); INSERT INTO TEACHERS(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 s.sname,s.ssex,s.class from STUDENTS s;
2、 查询教师所有的单位即不重复的Depart列。
select distinct t.depart from TEACHERS t;
3、 查询Student表的所有记录。
select * from STUDENTS;
4、 查询Score表中成绩在60到80之间的所有记录。
select * from SCORES s where s.degree>=60 and s.degree <=80;
5、 查询Score表中成绩为85，86或88的记录。
select * from SCORES s where s.degree=85 or s.degree =86 or s.degree =88;
6、 查询Student表中“95031”班或性别为“女”的同学记录。
select * from STUDENTS s where s.class=‘95031’ or s.ssex =‘女’;
7、 以Class降序查询Student表的所有记录。
select * from STUDENTS order by STUDENTS.class desc ;
8、 以Cno升序、Degree降序查询Score表的所有记录。
select * from SCORES sc order by sc.cno ,sc.degree desc;
9、 查询“95031”班的学生人数。
select count(1) from STUDENTS st where st.class=‘95031’;
10、查询Score表中的最高分的学生学号和课程号。
select sc.sno,sc.cno from SCORES sc where degree =(select MAX(sc2.degree) from SCORES sc2);
11、查询‘3-105’号课程的平均分。
select avg(degree) ‘‘3-105’号课程的平均分’ from COURSES co ,SCORES sc where co.cno=sc.cno and co.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 * from SCORES sc ,COURSES co where co.cno=sc.cno and co.cno like ‘3%’ and count(); select avg(degree) from SCORES sc ,COURSES co where co.cno=sc.cno and co.cno like ‘3%’ group by co.cno having count(1)>5; select avg(Degree) from SCORES group by Cno having count(*) > 5 and Cno like ‘3%’; ####### 13、查询最低分大于70，最高分小于90的Sno列。 select * from STUDENTS stu,SCORES sco where stu.sno=sco.sno and sco.degree =(select MIN(sco.degree) from STUDENTS stu,SCORES sco where stu.sno=sco.sno ) ; select Sno from SCORES where Degree >70 and Degree < 90;
select Sno from SCORES Degree be 70 and 90;
14、查询所有学生的Sname、Cno和Degree列。
select stu.sname,sco.cno ,sco.degree from STUDENTS stu,SCORES sco where stu.sno=sco.sno;
15、查询所有学生的Sno、Cname和Degree列。
select stu.sno,co.cname ,sco.degree from STUDENTS stu,SCORES sco,COURSES co where stu.sno=sco.sno and co.cno=sco.cno;
16、查询所有学生的Sname、Cname和Degree列。
select stu.sname,co.cname ,sco.degree from STUDENTS stu,SCORES sco,COURSES co where stu.sno=sco.sno and co.cno=sco.cno;
17、查询“95033”班所选课程的平均分。
select avg(degree) ‘“95033”班所选课程的平均分’ from STUDENTS st ,SCORES so where st.sno=so.sno and st.class=‘95033’ group by so.cno;
18、假设使用如下命令建立了一个grade表：
create table grade(low int,upp int,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 distinct (stu.sno),sco.cno, g.rank from STUDENTS stu,SCORES sco,grade g where stu.sno=sco.sno;
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 STUDENTS stu,SCORES sco,COURSES co where stu.sno=sco.sno and co.cno=sco.cno and co.cno=‘3-105’ and sco.degree> (select degree from STUDENTS stu,SCORES sco,COURSES co where stu.sno=sco.sno and co.cno=sco.cno and sco.sno=‘109’ and co.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 SCORES sco,COURSES co where co.cno=sco.cno and sco.degree not in (select MAX(sco.degree) from SCORES sco,COURSES co ) group by sco.sno; select * from SCORES a where Sno in (select Sno from SCORES group by Sno having count(*)>1) and Degree not in (select max(Degree) from SCORES b where b.Cno=a.Cno); select count(co.cno) from SCORES sco,COURSES co where co.cno=sco.cno and sco.degree group by sco.sno;
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 SCORES sco,COURSES co where co.cno=sco.cno and sco.degree> (select sco.degree from SCORES sco,COURSES co where co.cno=sco.cno and sco.sno=‘109’ and co.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 sno,sname,sbirthday from STUDENTS stu where 2020-YEAR(stu.sbirthday)=( select distinct 2020-YEAR(stu.sbirthday) from STUDENTS stu,SCORES sco,COURSES co where stu.sno=sco.sno and co.cno=sco.cno and stu.sno=‘107’); select Sno,Sname,Sbirthday from STUDENTS where year(Sbirthday) in (select year(Sbirthday) from STUDENTS where Sno=‘108’ or ‘101’);
23、查询“张旭“教师任课的学生成绩。
select sco.degree from SCORES sco ,TEACHERS tea where tea.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 TEACHERS where Tno in (select Tno from COURSES where Cno in (select Cno from SCORES group by Cno having count(Sno)>5)); select tname from TEACHERS where tno in (select tno from COURSES where cno in ( select cno from SCORES sc group by cno having count(sc.sno)>5));
25、查询95033班和95031班全体学生的记录。
select * from STUDENTS stu;
26、查询存在有85分以上成绩的课程Cno.
select co.cno from COURSES co ,SCORES sco where sco.cno=co.cno and sco.degree >85;
27、查询出“计算机系“教师所教课程的成绩表。
select degree from TEACHERS tea ,SCORES sco where tea.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 prof,tname from TEACHERS tea ;
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 co.cno,sco.sno,sco.degree from STUDENTS stu,SCORES sco,COURSES co where stu.sno=sco.sno and co.cno=sco.cno and co.cno=‘3-105’ and sco.degree >(select min( sc.degree) from SCORES sc where sc.cno=‘3-245’) order by sco.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 co.cno,sco.sno,sco.degree from STUDENTS stu,SCORES sco,COURSES co where stu.sno=sco.sno and co.cno=sco.cno and co.cno=‘3-105’ and sco.degree >(select max( sc.degree) from SCORES sc where sc.cno=‘3-245’) order by sco.degree desc ;
31、查询所有教师和同学的name、sex和birthday.
select tname 老师,tsex,tbirthday,sname 学生,ssex,sbirthday from TEACHERS ,STUDENTS ;
32、查询所有“女”教师和“女”同学的name、sex和birthday.
select tname 老师,tsex,tbirthday,sname 学生,ssex,sbirthday from TEACHERS ,STUDENTS where ssex=‘女’ and 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 SCORES so where so.degree <(select avg(so.degree) from SCORES so);
34、查询所有任课教师的Tname和Depart.
select tea.tname,depart from TEACHERS tea where prof like ‘讲师’;
35 查询所有未讲课的教师的Tname和Depart.
select tea.tname,depart from TEACHERS tea where prof not like ‘讲师’;
36、查询至少有2名男生的班号。
select class ,count(ssex) c from STUDENTS stu having c>=2;
37、查询Student表中不姓“王”的同学记录。
select * from STUDENTS stu where stu.sname not like ‘王%’;
38、查询Student表中每个学生的姓名和年龄。
SELECT sname 姓名,2020-YEAR(sbirthday) 年龄 FROM STUDENTS;
39、查询Student表中最大和最小的Sbirthday日期值。
select MAX(sbirthday),MIN(sbirthday) from STUDENTS stu ;
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 class 班号,2020-YEAR(sbirthday) 年龄 from STUDENTS stu order by sbirthday; select * from STUDENTS order by class desc,sbirthday asc;
41、查询“男”教师及其所上的课程。
select tname,cname from TEACHERS tea ,COURSES co where tea.tsex like ‘男’ and tea.tno =co.tno;
42、查询最高分同学的Sno、Cno和Degree列。
select * from SCORES sco where degree=(select max(degree) from SCORES) ;
43、查询和“李军”同性别的所有同学的Sname.
select sname from STUDENTS stu where stu.ssex = ( select stu.ssex from STUDENTS stu where stu.sname=‘李军’ ) having sname !=‘李军’;
44、查询和“李军”同性别并同班的同学Sname.
select * from STUDENTS stu where class='95031’and stu.ssex = ( select stu.ssex from STUDENTS stu where stu.sname=‘李军’ ) having 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 sco.degree from STUDENTS stu ,COURSES co ,SCORES sco where stu.sno=sco.sno and co.cno=sco.cno and cname=‘计算机导论’ and ssex=‘男’ order by degree;
