**oracle数据库查询语句练习题及答案写法
建表语句
/*CREATE TABLE STUDENT
(SNO VARCHAR(3) NOT NULL,
SNAME VARCHAR(4) NOT NULL,
SSEX VARCHAR(2) NOT NULL,
SBIRTHDAY DATE,
CLASS NUMBER 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 NUMBER NOT NULL);
CREATE TABLE TEACHER
(TNO VARCHAR(3) NOT NULL,
TNAME VARCHAR(4) NOT NULL,
TSEX VARCHAR(2) NOT NULL,
TBIRTHDAY DATE NOT NULL,
PROF VARCHAR(6),
DEPART VARCHAR(10) NOT NULL);*/
/INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,‘曾华’ ,‘男’ ,to_date(‘1977-09-01’,‘yyyy-mm-dd’),95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (105 ,‘匡明’ ,‘男’ ,to_date(‘1975-10-02’,‘yyyy-mm-dd’),95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (107 ,‘王丽’ ,‘女’ ,to_date(‘1976-01-23’,‘yyyy-mm-dd’),95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,‘李军’ ,‘男’ ,to_date(‘1976-02-20’,‘yyyy-mm-dd’),95033);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (109 ,‘王芳’ ,‘女’ ,to_date(‘1975-02-10’,‘yyyy-mm-dd’),95031);
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (103 ,‘陆君’ ,‘男’ ,to_date(‘1974-06-03’,‘yyyy-mm-dd’),95031);
commit;/
/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);
commit;/
/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);
commit;/
/INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (804,‘李诚’,‘男’,to_date(‘1958-12-02’,‘yyyy-mm-dd’),‘副教授’,‘计算机系’);
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (856,‘张旭’,‘男’,to_date(‘1969-03-12’,‘yyyy-mm-dd’),‘讲师’,‘电子工程系’);
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (825,‘王萍’,‘女’,to_date(‘1972-05-05’,‘yyyy-mm-dd’),‘助教’,‘计算机系’);
INSERT INTO TEACHER(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (831,‘刘冰’,‘女’,to_date(‘1977-08-14’,‘yyyy-mm-dd’),‘助教’,‘电子工程系’);
commit;/**
/查询Student表中的所有记录的Sname、Ssex和Class列。/
select sname,ssex,class from student
/查询教师所有的单位即不重复的Depart列。/
select distinct depart from teacher
/查询Student表的所有记录。/
select * from student
/查询Score表中成绩在60到80之间的所有记录/
select degree from score where degree between 60 and 80
/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’
/查询Score表中成绩为85，86或88的记录。/
select * from score where degree in (85,86,88)
/以Class降序查询Student表的所有记录。/
select * from student order by class desc
/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
/查询“95031”班的学生人数。 /
select count() from student where class = 95031
/查询Score表中的最高分的学生学号和课程号。/
select sno,cno from score sc where degree = (select max(degree) from score)
/查询‘3-105’号课程的平均分。/
select avg(degree) from score where cno = ‘3-105’
/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 avg(degree) from score a
where (select count(sno) from score b where a.cno = b.cno group by cno)>5
and cno like ‘3%’
/查询最低分大于70，最高分小于90的Sno列。/
select sno ,degree from score where degree > 70 and degree < 90
/查询所有学生的Sname、Cno和Degree列。/
select s.sname , sc.cno , sc.degree from student s , score sc where s.sno = sc.sno
/查询所有学生的Sno、Cname和Degree列。/
select s.sno , c.cname , sc.degree from student s , score sc , course c
where sc.cno = c.cno and s.sno = sc.sno
/查询所有学生的Sname、Cname和Degree列。/
select s.sname , c.cname , sc.degree from student s , score sc , course c
where s.sno= sc.sno and sc.cno = c.cno
/查询“95033”班所选课程的平均分。/
select avg(degree) from score sc
where sno = any(select sno from student where class = ‘95033’)
group by sc.cno
/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 sc
where cno = ‘3-105’
and degree > all(select degree from score where sno = ‘109’ and cno = ‘3-105’)
/查询score中选学一门以上课程的同学中分数为非最高成绩的记录。/
select * from score a where sno in (
select sno from score group by sno having count()>1) --子查询 选多门课的同学
and a.degree<(select max(degree) from score b where a.cno=b.cno )
/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 e where e.cno=‘3-105’ and e.degree >
(select e1.degree from score e1 where e1.cno =‘3-105’ and e1.sno=109)
/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 Extract(year from sbirthday) from student/
select sno , sname , sbirthday
from student a
where (Select Extract(year from sbirthday) from student t where a.sno = t.sno)
= select Extract(year from sbirthday) from student where sno = ‘108’)
/查询“张旭“教师任课的学生成绩。/
select sno,degree from course c,score sc,teacher t
where t.tno=c.tno and c.cno = sc.cno and t.tname = ‘张旭’
/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 Cno having COUNT(*)>5) )
/查询95033班和95031班全体学生的记录。/
select * from student where class in (95033,95031)
/查询存在有85分以上成绩的课程Cno./
SELECT * FROM score sc WHERE sc.degree > 85
/查询出“计算机系“教师所教课程的成绩表。/
select * from teacher t , score sc , course c
where t.depart = ‘计算机系’
and t.tno = c.tno
and c.cno = sc.cno
/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
teacher.PROF NOT IN (SELECT PROF FROM TEACHER WHERE DEPART = ‘电子工程系’);
/查询选修编号为“3-105“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 degree > any(select degree from score where cno = ‘3-245’)
and cno = ‘3-105’
order by degree desc
/查询选修编号为“3-105”且
成绩高于选修编号为“3-245”的同学的Cno、Sno和Degree./
select cno,sno,degree from score
where degree > any(select degree from score where cno = ‘3-245’)
and cno = ‘3-105’
order by degree desc
/查询所有教师和同学的name、sex和birthday./
select Sname as name,Ssex as sex,Sbirthday as birthday from student
union all
select Tname as name,Tsex as sex,Tbirthday as birthday from Teacher
/union并集操作/
/查询所有“女”教师和“女”同学的name、sex和birthday./
select Sname as name,Ssex as sex,Sbirthday as birthday from student where ssex = ‘女’
union all
select Tname as name,Tsex as sex,Tbirthday as birthday from Teacher where tsex = ‘女’
/查询成绩比该课程平均成绩低的同学的成绩表。/
select * from score a,(select avg(degree) av,cno from score b group by cno ) r
where a.degree < r.av
and a.cno = r.cno
/查询所有任课教师的Tname和Depart./
select tname,depart from teacher
/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)
/查询至少有2名男生的班号。/
SELECT s.class FROM student s where ssex = '男’GROUP BY s.class HAVING COUNT() >= 2/count()未能很好理解/
/查询Student表中不姓“王”的同学记录。/
select * from student where sname not like ‘王%’
/查询Student表中每个学生的姓名和年龄。/
select sname,（select extract(year from sysdate) from dual)-(extract(year from sbirthday)) 年龄 from student
/查询Student表中最大和最小的Sbirthday日期值。/
select max(sbirthday),min(sbirthday) from student
select * from student
/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,sbirthday desc
/查询“男”教师及其所上的课程。/
sELECT * FROM course c, teacher t WHERE c.tno=t.tno AND t.tsex=‘男’
–查询最高分同学的Sno、Cno和Degree列。
select student.sno,cno,degree from student ,score
where score.sno = student.sno
and score.degree = (select max(score.degree) from score)
–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’)
and sname not in ‘李军’
–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 not in ‘李军’
–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’)
在网上找的一套题 原题答案错误比较多，格式也比较乱，自己在练习的时候重新整理了一下供大家参考，本练习中涉及的大部分知识点都在
我的另一篇博客中，https://blog.csdn.net/weixin_42731928/article/details/83096484
附上原文地址https://www.cnblogs.com/xfxy/p/7077749.html