SQL学习笔记之MySQL查询练习2
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0x00 数据准备
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');
0x01 练习题目
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 number(3,0),upp number(3),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。 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
0x02 参考答案
#1.查询Student表中的所有记录的Sname、Ssex和Class列。 SELECT Sname,Ssex,Class FROM Student; #2.查询教师所有的单位即不重复的Depart列。 SELECT DISTINCT Depart FROM Teachers; #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 WHERE Degree BETWEEN 60 AND 80; #5.查询Score表中成绩为85,86或88的记录。 SELECT * FROM Scores WHERE Degree IN (85,86,88); #6.查询Student表中“95031”班或性别为“女”的同学记录。 SELECT * FROM Students WHERE Class='95031' OR Ssex='女'; #7.以Class降序查询Student表的所有记录。 SELECT * FROM Students ORDER BY Class DESC; #8.以Cno升序、Degree降序查询Score表的所有记录。 SELECT * FROM Scores ORDER BY Cno ASC,Degree DESC; #9.查询“95031”班的学生人数。 SELECT COUNT(1) AS StuNum FROM Students WHERE Class='95031'; #10.查询Score表中的最高分的学生学号和课程号。 SELECT Sno,Cno FROM Scores ORDER BY Degree DESC LIMIT 1; #11.查询‘3-105’号课程的平均分。 SELECT AVG(Degree) FROM Scores 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 Cno,AVG(Degree) FROM Scores WHERE Cno LIKE '3%' GROUP BY Cno HAVING COUNT(Sno) >= 5; #13.查询最低分大于70,最高分小于90的Sno列。 SELECT Sno FROM Scores GROUP BY Sno HAVING MAX(Degree)<90 AND MIN(Degree)>70; #14.查询所有学生的Sname、Cno和Degree列。 SELECT Sname,Cno,Degree FROM Students INNER JOIN Scores ON(Students.Sno=Scores.Sno) ORDER BY Sname; #15.查询所有学生的Sno、Cname和Degree列。 SELECT Sno,Cname,Degree FROM Scores INNER JOIN Courses ON(Scores.Cno=Courses.Cno) ORDER BY Sno; #16.查询所有学生的Sname、Cname和Degree列。 SELECT Sname,Cname,Degree FROM Students INNER JOIN Scores ON(Students.Sno=Scores.Sno) INNER JOIN Courses ON(Scores.Cno=Courses.Cno) ORDER BY Sname; #17.查询“95033”班所选课程的平均分。 SELECT Cname,AVG(Degree) FROM Students INNER JOIN Scores ON(Students.Sno=Scores.Sno) INNER JOIN Courses ON(Scores.Cno=Courses.Cno) WHERE Class='95033' GROUP BY Courses.Cno ORDER BY Cname; #18.假设使用如下命令建立了一个grade表(略)现查询所有同学的Sno、Cno和rank列。 SELECT Sno,Cno,rank FROM Scores INNER JOIN grade ON(Scores.Degree>=grade.low AND Scores.Degree<=grade.upp) ORDER BY 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 s1.Sno,s1.Degree FROM Scores AS s1 INNER JOIN Scores AS s2 ON(s1.Cno=s2.Cno AND s1.Degree>s2.Degree) WHERE s1.Cno='3-105' AND s2.Sno='109' ORDER BY s1.Sno; #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 GROUP BY Sno HAVING COUNT(cno)>1 AND Degree!=MAX(Degree); #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 s1.Sno,s1.Degree FROM Scores AS s1 INNER JOIN Scores AS s2 ON(s1.Cno=s2.Cno AND s1.Degree>s2.Degree) WHERE s1.Cno='3-105' AND s2.Sno='109' ORDER BY s1.Sno; #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 s1.Sno,s1.Sname,s1.Sbirthday FROM Students AS s1 INNER JOIN Students AS s2 ON(YEAR(s1.Sbirthday)=YEAR(s2.Sbirthday)) WHERE s2.Sno='108'; #23.查询“张旭“教师任课的学生成绩。 SELECT Sno,Degree FROM Scores INNER JOIN Courses ON(Scores.Cno=Courses.Cno) INNER JOIN Teachers ON(Courses.Tno=Teachers.Tno) WHERE Teachers.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 DISTINCT Tname FROM Scores INNER JOIN Courses ON(Scores.Cno=Courses.Cno) INNER JOIN Teachers ON(Courses.Tno=Teachers.Tno) WHERE Courses.Cno IN(SELECT Cno FROM Scores GROUP BY(Cno) HAVING COUNT(Sno)>5); #25.查询95033班和95031班全体学生的记录。 SELECT * FROM Students WHERE Class IN ('95033','95031') ORDER BY Class; #26.查询存在有85分以上成绩的课程Cno. SELECT DISTINCT Cno FROM Scores WHERE Degree>85; #27.查询出“计算机系“教师所教课程的成绩表。 SELECT Tname,Cname,SName,Degree FROM Teachers INNER JOIN Courses ON(Teachers.Tno=Courses.Tno) INNER JOIN Scores ON(Courses.Cno=Scores.Cno) INNER JOIN Students ON(Scores.Sno=Students.Sno) WHERE Teachers.Depart='计算机系' ORDER BY Tname,Cname,Degree DESC; #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 Tname,Prof FROM Teachers WHERE Depart='计算机系' AND Prof NOT IN( SELECT DISTINCT Prof FROM Teachers WHERE Depart='电子工程系'); #29.查询选修编号为“3-105“课程且成绩至少高于任意选修编号为“3-245”的同学的成绩的Cno、Sno和Degree,并按Degree从高到低次序排序。 SELECT Cno,Sno,Degree FROM Scores WHERE Cno='3-105' AND Degree > ANY( SELECT Degree FROM Scores WHERE Cno='3-245') ORDER BY Degree DESC; #30.查询选修编号为“3-105”且成绩高于所有选修编号为“3-245”课程的同学的Cno、Sno和Degree. SELECT Cno,Sno,Degree FROM Scores WHERE Cno='3-105' AND Degree > ALL( SELECT Degree FROM Scores WHERE Cno='3-245') ORDER BY Degree DESC; #31.查询所有教师和同学的name、sex和birthday. SELECT Sname,Ssex,Sbirthday FROM Students UNION SELECT Tname,Tsex,Tbirthday FROM Teachers; #32.查询所有“女”教师和“女”同学的name、sex和birthday. SELECT Sname,Ssex,Sbirthday FROM Students WHERE Ssex='女' UNION SELECT Tname,Tsex,Tbirthday FROM Teachers WHERE Tsex='女'; #33.查询成绩比该课程平均成绩低的同学的成绩表。 SELECT s1.* FROM Scores AS s1 INNER JOIN ( SELECT Cno,AVG(Degree) AS aDegree FROM Scores GROUP BY Cno) s2 ON(s1.Cno=s2.Cno AND s1.Degree<s2.aDegree); #34.查询所有任课教师的Tname和Depart. SELECT Tname,Depart FROM Teachers WHERE Tno IN( SELECT Tno FROM Courses ); #35.查询所有未讲课的教师的Tname和Depart. SELECT Tname,Depart FROM Teachers WHERE Tno NOT IN( SELECT Tno FROM Courses ); #36.查询至少有2名男生的班号。 SELECT Class,COUNT(1) AS boyCount FROM Students WHERE Ssex='男' GROUP BY Class HAVING boyCount>=2; #37.查询Student表中不姓“王”的同学记录。 SELECT * FROM Students WHERE Sname NOT LIKE '王%'; #38.查询Student表中每个学生的姓名和年龄。 SELECT Sname,YEAR(NOW())-YEAR(Sbirthday) AS Sage FROM Students; #39.查询Student表中最大和最小的Sbirthday日期值。 SELECT MIN(Sbirthday),MAX(Sbirthday) FROM Students; #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 Students ORDER BY Class DESC,Sbirthday ASC; #41.查询“男”教师及其所上的课程。 SELECT Teachers.Tname,Courses.Cname FROM Teachers INNER JOIN Courses ON(Teachers.Tno=Courses.Tno) WHERE Teachers.Tsex='男'; #42.查询最高分同学的Sno、Cno和Degree列。 SELECT * FROM Scores GROUP BY Cno HAVING Degree=Max(Degree); #43.查询和“李军”同性别的所有同学的Sname. SELECT s1.Sname FROM Students AS s1 INNER JOIN Students AS s2 ON(s1.Ssex=s2.Ssex) WHERE s2.Sname='李军'; #44.查询和“李军”同性别并同班的同学Sname. SELECT s1.Sname FROM Students AS s1 INNER JOIN Students AS s2 ON(s1.Ssex=s2.Ssex AND s1.Class=s2.Class) WHERE s2.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 * FROM Scores WHERE Sno IN ( SELECT Sno FROM Students WHERE Ssex='男') AND Cno IN ( SELECT Cno FROM Courses WHERE Cname='计算机导论');
github地址: https://github.com/nql1314/sql-practises