不得不说SQL是数据分析师入门的基础,想开始从事数据分析工作的同学最好将SQL练一练再找工作。大概看了一个月的MYSQL从入门到精通,无奈纸上谈兵,没有实战经验,于是从网上找了一些练习题,整理成下文。这些练习题算是入门SQL比较好的题库,如果觉得这些题目不够过瘾的同学可以参考我的另一篇文章《SQL进阶练习题》,去更深入地学习。
SQL进阶练习题
导入数据表
首先需要建立空白的数据库STUDENT,再导入如下几张表供练习题所用。
# 创建数据库STUDENT
CREATE DATABASE STUDENT;
# 创建表STUDENT
CREATE TABLE STUDENT (SNO VARCHAR(3) NOT NULL, SNAME VARCHAR(4) NOT NULL, SSEX VARCHAR(2) NOT NULL, SBIRTHDAY DATETIME, CLASS VARCHAR(5));
# 创建表COURSE
CREATE TABLE COURSE (CNO VARCHAR(5) NOT NULL, CNAME VARCHAR(10) NOT NULL, TNO VARCHAR(10) NOT NULL);
# 创建表SCORE
CREATE TABLE SCORE (SNO VARCHAR(3) NOT NULL, CNO VARCHAR(5) NOT NULL, DEGREE NUMERIC(10, 1) NOT NULL);
# 创建表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);
# 向各表导入数据
INSERT INTO STUDENT (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,'曾华' ,'男' ,'1977-09-01',95033), (105 ,'匡明' ,'男' ,'1975-10-02',95031), (107 ,'王丽' ,'女' ,'1976-01-23',95033), (101 ,'李军' ,'男' ,'1976-02-20',95033), (109 ,'王芳' ,'女' ,'1975-02-10',95031), (103 ,'陆君' ,'男' ,'1974-06-03',95031);
INSERT INTO COURSE(CNO,CNAME,TNO) VALUES ('3-105' ,'计算机导论',825), ('3-245' ,'操作系统' ,804), ('6-166' ,'数据电路' ,856), ('9-888' ,'高等数学' ,100);
INSERT INTO SCORE(SNO,CNO,DEGREE) VALUES (103,'3-245',86), (105,'3-245',75), (109,'3-245',68), (103,'3-105',92), (105,'3-105',88), (109,'3-105',76), (101,'3-105',64), (107,'3-105',91), (108,'3-105',78), (101,'6-166',85), (107,'6-106',79), (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'), (856,'张旭','男','1969-03-12','讲师','电子工程系'), (825,'王萍','女','1972-05-05','助教','计算机系'), (831,'刘冰','女','1977-08-14','助教','电子工程系');
题目
1、 查询Student表中的所有记录的Sname、Ssex和Class列。
2、 查询教师所有的单位即不重复的Depart列。
3、 查询Student表的所有记录。
4、 查询Score表中成绩在60到80之间的所有记录。
5、 查询Score表中成绩为85,86或88的记录。
6、 查询Student表中“95031”班或性别为“女”的同学记录。
7、 以Class降序查询Student表的所有记录。
8、 以Cno升序、Degree降序查询Score表的所有记录。
9、 查询“95031”班的学生人数。
10、查询Score表中的最高分的学生学号和课程号。
11、查询‘3-105’号课程的平均分。
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。
13、查询最低分大于70,最高分小于90的Sno列。
14、查询所有学生的Sname、Cno和Degree列。
15、查询所有学生的Sno、Cname和Degree列。
16、查询所有学生的Sname、Cname和Degree列。
17、查询“95033”班所选课程的平均分。
18、假设使用如下命令建立了一个grade表:
create table grade(low varchar(3),upp varchar(3),rank varchar(3));
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’);
现查询所有同学的Sno、Cno和rank列。
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。
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。
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。
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。
23、查询“张旭“教师任课的学生成绩。
24、查询选修某课程的同学人数多于5人的教师姓名。
25、查询95033班和95031班全体学生的记录。
26、查询存在有85分以上成绩的课程Cno.
27、查询出“计算机系“教师所教课程的成绩表。
28、查询“计算机系”与“电子工程系“不同职称的教师的Tname和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。
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.
31、查询所有教师和同学的name、sex和birthday.
32、查询所有“女”教师和“女”同学的name、sex和birthday.
33、查询成绩比该课程平均成绩低的同学的成绩表。
34、查询所有任课教师的Tname和Depart.
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。
37、查询Student表中不姓“王”的同学记录。
38、查询Student表中每个学生的姓名和年龄。
39、查询Student表中最大和最小的Sbirthday日期值。
40、以班号和年龄从大到小的顺序查询Student表中的全部记录。
41、查询“男”教师及其所上的课程。
42、查询最高分同学的Sno、Cno和Degree列。
43、查询和“李军”同性别的所有同学的Sname.
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。
参考答案
- SELECT SNAME,SSEX,CLASS FROM STUDENT;
- SELECT DISTINCT DEPART FROM TEACHER;
- SELECT * FROM STUDENT;
- SELECT * FROM SCORE WHERE DEGREE BETWEEN 60 AND 80;
- SELECT * FROM SCORE WHERE DEGREE IN (85,86,88);
- SELECT * FROM STUDENT WHERE CLASS=95031 OR SSEX=’女’;
- SELECT * FROM STUDENT ORDER BY CLASS DESC;
- SELECT * FROM SCORE ORDER BY CNO,DEGREE DESC;
- SELECT COUNT(*) NUMBER FROM STUDENT WHERE CLASS=95031;
- SELECT SNO,CNO FROM SCOREWHERE DEGREE=(SELECT MAX(DEGREE) FROM SCORE);
- SELECT AVG(DEGREE) FROM SCORE WHERE CNO=’3-105’;
- SELECT AVG(DEGREE),CNO FROM SCORE WHERE CNO LIKE ‘3%’
GROUP BY CNO HAVING COUNT(SNO)>=5; - SELECT CNO FROM SCORE WHERE DEGREE>70&&DEGREE<90;
- SELECT P.SNAME,Q.CNO,Q.DEGREE
FROM STUDENT P INNER JOIN SCORE Q ON P.SNO=Q.SNO; - SELECT A.CNO,A.CNAME,B.DEGREE
FROM COURSE A INNER JOIN SCORE B
ON A.CNO=B.CNO;
A.CNAME,B.DEGREE,C.SNAME
FROM COURSE A INNER JOIN (SCORE B,STUDENT C)
ON A.CNO=B.CNO AND B.SNO=C.SNO; - SELECT AVG(DEGREE)
FROM STUDENT A INNER JOIN SCORE B
ON A.SNO=B.SNO
WHERE A.CLASS=95033; - SELECT AVG(DEGREE)
FROM STUDENT A INNER JOIN SCORE B
ON A.SNO=B.SNO
WHERE A.CLASS=95033; - SELECT A.SNO,A.CNO,B.rank from score A ,grade B
WHERE A.DEGREE>=B.low && A.DEGREE<=B.upp; - SELECT * FROM SCORE
WHERE CNO=’3-105’ AND DEGREE>
ALL(SELECT DEGREE FROM SCORE WHERE SNO=109 AND CNO=’3-105’); - SELECT * FROM SCORE
WHERE DEGREE NOT IN
(SELECT MAX(DEGREE) FROM SCORE
GROUP BY SNO )
AND SNO IN
(SELECT SNO FROM SCORE
GROUP BY SNO HAVING COUNT(SNO)>1); - SELECT * FROM SCORE
WHERE DEGREE>(SELECT DEGREE FROM SCORE
WHERE SNO=109 AND CNO=’3-105’); - SELECT * FROM STUDENT
WHERE YEAR(SBIRTHDAY)=(
SELECT YEAR(SBIRTHDAY) FROM STUDENT WHERE SNO=108) - SELECT A.SNO,A.DEGREE
FROM SCORE A JOIN (TEACHER B,COURSE C)
ON A.CNO=C.CNO AND B.TNO=C.TNO
WHERE B.TNAME=’张旭’; - SELECT B.TNAME
FROM SCORE A JOIN (TEACHER B,COURSE C)
ON (A.CNO=C.CNO AND B.TNO=C.TNO)
GROUP BY A.CNO HAVING COUNT(A.CNO)>5; - SELECT * FROM STUDENT WHERE CLASS IN (95033,95031);
- SELECT DISTINCT CNO FROM SCORE WHERE DEGREE>85;
- SELECT A.SNO,A.CNO,A.DEGREE
FROM SCORE A JOIN (TEACHER B,COURSE C);
ON A.CNO=C.CNO AND B.TNO=C.TNO
WHERE DEPART=’计算机系’; - SELECT TNAME,PROF FROM TEACHER
WHERE DEPART=’计算机系’ AND PROF NOT IN (
SELECT PROF FROM TEACHER WHERE DEPART=’电子工程系’); - SELECT * FROM SCORE
WHERE CNO=’3-105’ AND DEGREE>ANY(
SELECT DEGREE FROM SCORE WHERE CNO=’3-245’)
ORDER BY DEGREE DESC; - SELECT * FROM SCORE
WHERE CNO=’3-105’ AND DEGREE>ALL(
SELECT DEGREE FROM SCORE WHERE CNO=’3-245’); - SELECT SNAME,SSEX,SBIRTHDAY FROM STUDENT
UNION
SELECT TNAME,TSEX,TBIRTHDAY FROM TEACHER; - SELECT SNAME NAME,SSEX SEX,SBIRTHDAY BIRTHDAY FROM STUDENT
WHERE SSEX=’女’
UNION
SELECT TNAME,TSEX,TBIRTHDAY FROM TEACHER
WHERE TSEX=’女’; SELECT A.* FROM SCORE A INNER JOIN
(SELECT CNO,AVG(DEGREE) AVG
FROM SCORE GROUP BY CNO) B
ON A.CNO=B.CNO
WHERE DEGREE<AVG;SELECT A.TNAME,A.DEPART FROM TEACHER A JOIN COURSE B ON A.TNO=B.TNO;
- SELECT TNAME,DEPART FROM TEACHER
WHERE TNO NOT IN (SELECT TNO FROM COURSE); - SELECT CLASS FROM STUDENT
WHERE SSEX=’男’
GROUP BY CLASS HAVING COUNT(SSEX)>1; - SELECT CLASS FROM STUDENT WHERE SSEX=’女’
GROUP BY CLASS HAVING COUNT(SSEX)>1; - SELECT * FROM STUDENT WHERE NOT SNAME LIKE ‘王%’;
- SELECT SNAME,YEAR(NOW())-YEAR(SBIRTHDAY) AGE FROM STUDENT;SELECT * FROM student ORDER BY CLASS DESC,SBIRTHDAY;
- SELECT * FROM student ORDER BY CLASS DESC,SBIRTHDAY;
- SELECT CNO,CNAME FROM COURSE
WHERE TNO IN (SELECT TNO FROM TEACHER WHERE TSEX=’男’); - SELECT SNO,CNO,DEGREE
FROM SCORE WHERE DEGREE=(SELECT MAX(DEGREE) FROM SCORE); - SELECT SNAME FROM student WHERE SSEX=
(SELECT SSEX FROM STUDENT WHERE SNAME=’李军’); - SELECT SNAME FROM student WHERE (SSEX,CLASS)=
(SELECT SSEX,CLASS FROM STUDENT WHERE SNAME=’李军’); - SELECT A.* FROM SCORE A JOIN(STUDENT B,COURSE C)
ON A.SNO=B.SNO AND A.CNO=C.CNO
WHERE B.SSEX=’男’ AND C.CNAME=’计算机导论’;