经典SQL练习题（45题）
本人也是引用的别人的题目，sql亲测过，如果有更好的写法，请给我留言，大家一起进步，谢谢！！！
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);
– 查询Student表中的所有记录的Sname、Ssex和Sclass列。
select Sname,Ssex,Sclass 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 * from score where degree BETWEEN 60 and 80
– 查询Score表中成绩为85，86或88的记录。
select * from score WHERE degree in (85,86,88)
– 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';
select * from student where SCLASS = 95031 UNION select * from student where SSEX = '女'
– 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 cno asc,degree DESC
– 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名学生选修的并以3开头的课程的平均分数。
select AVG(DEGREE) from score 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 score GROUP BY sno having MIN(degree) >70 and MAX(DEGREE) <90
– 14、查询所有学生的Sname、Cno和Degree列。
select student.sname,score.cno,score.DEGREE from student,score where score.sno = student.SNO
– 15、查询所有学生的Sno、Cname和Degree列。
select score.SNO,course.cname,score.degree from score,course where score.cno = course.cno
select score.sno,course.cname,score.DEGREE from score INNER JOIN course on (score.CNO = course.CNO)
select student.sno,course.cname,score.degree from score,course,student where student.sno = score.sno and course.cno = score.CNO
– 16、查询所有学生的Sname、Cname和Degree列。
select student.sname,course.cname,score.degree from student,course,score WHERE score.CNO = course.cno and student.sno = score.SNO;
select student.sname,course.cname,score.degree from student INNER JOIN course INNER JOIN score on score.CNO = course.cno and student.sno = score.SNO;
– 17、查询“95033”班所选课程的平均分。.
select course.cname as Cname,AVG(degree) as Degree from student INNER JOIN score INNER JOIN course on student.SNO = score.sno and score.cno = course.cno and student.sclass = '95033' GROUP BY course.cname,course.CNO
select AVG(degree) from score,student where score.sno = student.sno and student.sclass = '95033' GROUP BY score.cno
– 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。
-- 错误的 select * from student INNER JOIN score on score.sno=student.sno ORDER BY score.DEGREE >(select DEGREE from score where SNO ='105')
select student.* from student,score where student.sno = score.sno and score.cno = '3-105' and score.degree >(SELECT degree from score where score.sno = '109' and score.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。 这个有问题
select * from score where score.degree <>(select MAX(degree) from score sc where sc.cno = score.cno) and score.sno in (select score.sno from score GROUP BY score.sno HAVING count(*) >1);
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);
– 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 score.CNO = '3-105' and score.DEGREE >(SELECT DEGREE from score where score.sno = '109' and score.CNO = '3-105')
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);
– 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 student s where YEAR(sbirthday) = (select YEAR(sbirthday) from student where student.sno = 108)
select s.SNO,s.SNAME,s.SBIRTHDAY from student s WHERE year(SBIRTHDAY) =(select year(SBIRTHDAY) from student where student.SNO=108);
select s.SNO,s.SNAME,s.SBIRTHDAY from student s WHERE year(SBIRTHDAY) =(select year(SBIRTHDAY) from student where student.SNO=108)
– 23、查询“张旭“教师任课的学生成绩。
select degree from teacher INNER JOIN course INNER JOIN score on teacher.tno = course.tno and score.cno = course.cno where teacher.TNAME = '张旭'
select score.degree from teacher INNER JOIN course INNER JOIN score on score.cno = course.cno and course.tno = teacher.tno where teacher.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。
-- 错的 select teacher.tname as teachname from teacher,score,course where teacher.tno = course.tno and course.cno = score.cno and (select count(*) from score) >5
select teacher.tname from teacher where teacher.tno=(select course.tno from course,score where score.cno = course.cno GROUP BY score.cno HAVING count(*)>5)
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);
– 25、查询95033班和95031班全体学生的记录。
select * from student where sclass = '95033' or sclass = '95031'
– 26、查询存在有85分以上成绩的课程Cno.
select DISTINCT score.cno from score WHERE degree in (select degree from score where degree >85)
select DISTINCT score.cno from score
select score.cno from score GROUP BY score.cno HAVING MAX(degree) >85
select distinct(cno) from score where degree>85
select sc.CNO from score sc GROUP BY sc.CNO having MAX(degree)>85;
– 27、查询出“计算机系“教师所教课程的成绩表。
select degree from score INNER JOIN teacher INNER JOIN course on teacher.tno = course.tno and score.cno = course.cno WHERE teacher.depart = '计算机系'
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';
28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。 有问题
select tname,prof from teacher t1,teacher t2 where t1.depart = t2.depart and t1.prof <>t2.prof
select tname,prof from teacher where prof not in (select a.prof from teacher a INNER JOIN teacher b on a.prof = b.prof where a.depart <> b.depart)
select depart,tname,prof from teacher where prof not in (select DISTINCT a.prof from teacher a INNER JOIN teacher b on a.prof = b.prof where a.depart <> b.depart)
select te.TNAME,te.PROF
from teacher te , teacher tea
where te.depart=tea.depart and te.prof <>tea.prof;
– 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 score.cno,score.sno,score.degree from score where score.cno = '3-105' and score.degree >(select MAX(degree) from score s where s.cno = '3-245') ORDER BY score.degree DESC
– 31、查询所有教师和同学的name、sex和birthday.
select teacher.tname,teacher.TSEX,teacher.TBIRTHDAY from teacher UNION ALL select student.sname,student.SSEX,student.SBIRTHDAY from student
– 32、查询所有“女”教师和“女”同学的name、sex和birthday.
select teacher.tname,teacher.TSEX,teacher.TBIRTHDAY from teacher where teacher.TSEX = '女' union all select student.sname,student.SSEX,student.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 score.degree,student.SNAME from score,student where score.DEGREE <(select AVG(degree) from score s where s.cno =score.cno)
select * from score where score.degree <(select AVG(degree) from score s where s.cno = score.cno)
– 34、查询所有任课教师的Tname和Depart
select teacher.tname,teacher.DEPART from teacher,course where teacher.tno = course.tno
select t.TNAME,t.DEPART from teacher t,course c where t.TNO=c.TNO;
– 35、查询所有未讲课的教师的Tname和Depart
– 36、查询至少有2名男生的班号。
select student.sclass from student
select COUNT(ssex) from student where ssex = '男' GROUP BY sclass
select DISTINCT sclass from student where sclass in (select sclass from student s where s.ssex = '男' GROUP BY s.sclass HAVING COUNT(*) >=2);
select DISTINCT sclass from student where sclass in (select sclass from student s where s.ssex = '男' GROUP BY s.sclass 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。
-- CURDATE()、CURRENT_DATE()
select sname,ROUND(DATEDIFF(now(),SBIRTHDAY)/365.2422) as age from student
explain select ROUND(DATEDIFF(now(),(select SBIRTHDAY from student where sno ='107'))/365) as age
select sname, round(datediff(curdate(), sbirthday)/365.2422) age from student;
– 39、查询Student表中最大和最小的Sbirthday日期值。
select MAX(SBIRTHDAY) as maxDate,MIN(SBIRTHDAY) as minDate 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 desc
select * from student ORDER BY SCLASS desc,SBIRTHDAY asc
– 41、查询“男”教师及其所上的课程。
select teacher.TNAME,course.CNAME from teacher INNER JOIN course on teacher.tno = course.tno and teacher.TSEX ='男'
select t.TNAME,c.CNAME from course c INNER JOIN teacher t ON(c.TNO=t.TNO) where t.TSEX='男';
– 42、查询最高分同学的Sno、Cno和Degree列。
select student.sname,score.sno,score.cno, MAX(score.degree)from student,score where student.sno = score.sno
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')
SELECT s.SNAME from student s where s.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
45、查询所有选修“计算机导论”课程的“男”同学的成绩表
SELECT
student.sname,
score.*
FROM
score
INNER JOIN course
INNER JOIN student ON score.sno = student.sno
AND score.cno = course.cno
WHERE
course.cname = '计算机导论'
AND student.ssex = '男'
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';
select sno, degree from score
where sno in (select s.sno from score s
left join student st on st.sno = s.sno
left join course c on c.cno = s.cno
where ssex = '男' and cname = '计算机导论');
现查询所有同学的Sno、Cno和rank列。
诸位 剩下的交给你们了。