第一个学生表，五个字段分别为学号，姓名，性别，生日，班级 第二个教师表，分别为职工号，姓名，生日，部门 第三个为课程表，分别为课程号，课程名，授课教师的教师号 第四个为成绩表，三个字段为学号，课程号，成绩
测试数据
CREATE TABLE STUDENT
(SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATE,
SCLASS VARCHAR(5));
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);
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, 0) NOT NULL);
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
- 查询Student表中的所有记录的Sname、Ssex和Sclass列。
- 查询教师所有的单位即不重复的Depart列。
- 查询Student表的所有记录。
- 查询Score表中成绩在60到80之间的所有记录。
- 查询Score表中成绩为85，86或88的记录。
- 查询Student表中“95031”班或性别为“女”的同学记录。
- 以Class降序查询Student表的所有记录。
- 以Cno升序、Degree降序查询Score表的所有记录。
- 查询“95031”班的学生人数。
- 查询Score表中的最高分的学生学号和课程号。
- 查询‘3-105’号课程的平均分。
- 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。
- 查询最低分大于70，最高分小于90的Sno列。
- 查询所有学生的Sname、Cno和Degree列。
- 查询所有学生的Sno、Cname和Degree列。
- 查询所有学生的Sname、Cname和Degree列。
- 查询“95033”班所选课程的平均分。
- 假设使用如下命令建立了一个grade表： create table grade( low INTEGER, upp INTEGER, 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。
- 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。
- 查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。
- 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。
- 查询“张旭“教师任课的学生成绩。
- 查询选修某课程的同学人数多于5人的教师姓名。
- 查询95033班和95031班全体学生的记录。
- 查询存在有85分以上成绩的课程Cno.
- 查询出“计算机系“教师所教课程的成绩表。
- 查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。
- 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。
- 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.
- 查询所有教师和同学的name、sex和birthday.
- 查询所有“女”教师和“女”同学的name、sex和birthday.
- 查询成绩比该课程平均成绩低的同学的成绩表。
- 查询所有任课教师的Tname和Depart.
- 查询所有未讲课的教师的Tname和Depart.
- 查询至少有2名男生的班号。
- 查询Student表中不姓“王”的同学记录。
- 查询Student表中每个学生的姓名和年龄。
- 查询Student表中最大和最小的Sbirthday日期值。
- 以班号和年龄从大到小的顺序查询Student表中的全部记录。
- 查询“男”教师及其所上的课程。
- 查询最高分同学的Sno、Cno和Degree列。
- 查询和“李军”同性别的所有同学的Sname.
- 查询和“李军”同性别并同班的同学Sname.
- 查询所有选修“计算机导论”课程的“男”同学的成绩表
参考答案
-- 第一题
select sname,ssex,sclass from student;
-- 第二题
select DISTINCT DEPART from teacher;
-- 写法二
select DEPART from teacher GROUP BY DEPART having COUNT(*)>1;
-- 第三题
select * from Student;
-- 第四题
select * from score where DEGREE BETWEEN 60 and 80;
-- 第五题
select * from score where DEGREE in(85,86,88);
-- 第六题
select *
from student
where SCLASS=95031
UNION
select *
from student
where SSEX='女';
-- 写法二
select *
from student
where SCLASS=95031 or SSEX='女';
-- 第七题
select * from student ORDER BY SCLASS desc;
-- 第八题
select * from Score ORDER BY Cno ASC,DEGREE DESC;
-- 第九题
select COUNT(*) from student where SCLASS=95031;
-- 第十题
SELECT
SNO,
CNO
FROM
score
WHERE
DEGREE = (SELECT MAX(DEGREE) FROM score);
-- 十一题
select avg(DEGREE) from score where CNO='3-105';
-- 十二题
select AVG(DEGREE) from score GROUP BY CNO having COUNT(*)>5 and CNO like'3%';
-- 写法二
SELECT
AVG(DEGREE)
FROM
(
SELECT
*
FROM
score
WHERE
cno LIKE '3%'
) AS total
GROUP BY
CNO
HAVING
COUNT(*) > 5;
-- 十三题
select sno from score GROUP BY SNO having MAX(degree)<90 and MIN(DEGREE)>70 ;
-- 十四题
select st.SNAME,sc.CNO,sc.DEGREE
from student st,score sc
where st.SNO=sc.SNO;
-- 写法二
select st.SNAME,sc.CNO,sc.DEGREE
from student st INNER JOIN score sc
on (st.SNO=sc.SNO);
-- 十五题
select st.SNO,C.CNAME,sc.DEGREE
from student st INNER JOIN score sc INNER JOIN course c
on (st.SNO=sc.SNO and sc.CNO=c.CNO);
-- 写法二
select st.SNO,C.CNAME,sc.DEGREE
from student st ,score sc ,course c
where st.SNO=sc.SNO and sc.CNO=c.CNO;
-- 十六题
select st.SNAME,C.CNAME,sc.DEGREE
from student st ,score sc ,course c
where st.SNO=sc.SNO and sc.CNO=c.CNO;
-- 写法二
select st.SNAME,C.CNAME,sc.DEGREE
from student st INNER JOIN score sc INNER JOIN course c
on (st.SNO=sc.SNO and sc.CNO=c.CNO);
-- 十七题
select AVG( DEGREE)
FROM student st,score sc
where st.SCLASS=95033 and st.SNO=sc.SNO
GROUP BY sc.CNO;
-- 十八题
select st.SNO,sc.CNO,sc.DEGREE,grade.rank
FROM student st INNER JOIN score sc INNER JOIN grade
ON (st.SNO=sc.SNO and sc.DEGREE BETWEEN grade.low and grade.upp);
-- 十九题
SELECT
sc.*
FROM
student st,
score sc
WHERE
st.SNO = sc.SNO
AND sc.CNO = '3-105'
AND sc.DEGREE > (
SELECT
DEGREE
FROM
score sco
WHERE
sco.sno = 109
AND sco.cno = '3-105'
);
-- 二十题
SELECT *
from score sc
where sc.DEGREE <> (select MAX(degree) from score where score.CNO=sc.CNO)
and sc.SNO in (select sc.SNO from score GROUP BY sc.SNO HAVING COUNT(*)>1);
-- 二十一题
SELECT *
from score sc
where sc.CNO='3-105' and sc.DEGREE>(
select score.DEGREE
from score
where score.CNO='3-105' and score.SNO=109);
-- 二十二题 此题结果集为空
select s.SNO,s.SNAME,s.SBIRTHDAY from student s WHERE year(SBIRTHDAY) =(select year(SBIRTHDAY) from student where student.SNO=108);
--二十三题
select sc.DEGREE
from teacher t INNER JOIN course c INNER JOIN score sc
on (t.TNO=c.TNO and c.CNO=sc.CNO)
where t.TNAME='张旭';
--二十四题
select t.TNAME
from teacher t
where t.TNO=(
select c.TNO
from course c,score sc
where sc.CNO=c.CNO
GROUP BY sc.cno
HAVING COUNT(*)>5);
-- 二十五题
select *
from student s
where s.SCLASS=95033 or s.SCLASS=95031;
-- 二十六题
select sc.CNO
from score sc
GROUP BY sc.CNO
having MAX(degree)>85;
-- 二十七题
select sc.DEGREE
from score sc INNER JOIN teacher t INNER JOIN course c
on(t.TNO=c.TNO and c.CNO=sc.CNO)
where t.DEPART='计算机系';
-- 二十八题
select te.TNAME,te.PROF
from teacher te , teacher tea
where te.depart=tea.depart and te.prof <>tea.prof;
--二十九题
SELECT
sc.cno,
sc.SNO,
sc.DEGREE
FROM
score sc
WHERE
sc.CNO = '3-105'
AND sc.DEGREE > (
SELECT
MAX(DEGREE)
FROM
score
WHERE
score.CNO = '3-245'
)
ORDER BY
sc.DEGREE DESC;
-- 三十题
没看懂和二十九题有什么区别，555555
-- 三十一题
select st.sname,st.SSEX,st.SBIRTHDAY
from student st
union ALL
SELECT t.TNAME,t.TSEX,t.TBIRTHDAY
from teacher t;
-- 三十二题
select st.sname,st.SSEX,st.SBIRTHDAY
from student st
where st.SSEX='女'
union ALL
SELECT t.TNAME,t.TSEX,t.TBIRTHDAY
from teacher t
where t.TSEX='女';
--三十三题
select *
from score sc
WHERE sc.DEGREE<(select AVG( DEGREE) from score where sc.CNO=score.CNO);
-- 三十四题
select t.TNAME,t.DEPART
from teacher t,course c
where t.TNO=c.TNO;
-- 三十五题
所有老师都讲课，所以该结果集为空
-- 三十六题
select DISTINCT s.SCLASS
from student s
where s.SCLASS in (
select ss.SCLASS
from student ss
where ss.SSEX='男'
GROUP BY ss.SCLASS
having COUNT(*)>=2);
-- 三十七题
select *
from student s
where s.SNAME not like '王%';
-- 三十八题
略
-- 三十九题
select MAX(SBIRTHDAY),MIN(SBIRTHDAY)
from student;
-- 四十题
select *
from student
ORDER BY SCLASS desc,SBIRTHDAY ASC;
-- 四十一题
select t.TNAME,c.CNAME
from course c INNER JOIN teacher t
ON(c.TNO=t.TNO)
where t.TSEX='男';
--四十二题
与第十题基本一样
-- 四十三题
SELECT s.SNAME
from student s
where s.SSEX=(select SSEX from student where SNAME='李军');
-- 四十四题
SELECT s.SNAME
from student s
where (s.SSEX,s.SCLASS)=(select SSEX,SCLASS from student where SNAME='李军');
-- 四十五题
SELECT sc.*
from student st INNER JOIN score sc INNER JOIN course c
ON(st.SNO=sc.SNO and sc.CNO=c.CNO)
where c.CNAME='计算机导论' and st.SSEX='男';