Prepare data
create table statement
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 data
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');
topic
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
1. Query the Sname, Ssex, and Class columns of all records in the Student table.
SELECT Sname,Ssex,Class
FROM Student;
2. Query all the units of the teacher, that is, the non-repeated Department column.
SELECT DISTINCT Depart
FROM Teachers;
3. Query all records in the Student table.
SELECT *
FROM Students;
4. Query all records with scores between 60 and 80 in the Score table.
SELECT *
FROM Scores
WHERE Degree BETWEEN 60 AND 80;
5. Query the records with scores of 85, 86 or 88 in the Score table.
SELECT *
FROM Scores
WHERE Degree IN (85,86,88);
6. Query the records of classmates in the "95031" class or the gender of "female" in the Student table.
SELECT *
FROM Students
WHERE Class='95031' OR Ssex='女';
7. Query all records in the Student table in descending order of Class.
SELECT *
FROM Students
ORDER BY Class DESC;
8. Query all records in the Score table in ascending order of Cno and descending order of Degree.
SELECT *
FROM Scores
ORDER BY Cno,Degree DESC;
9. Query the number of students in class "95031".
SELECT COUNT(1) AS StuNum
FROM Students
WHERE Class='95031';
10. Query the student number and course number with the highest score in the Score table.
SELECT Sno,Cno
FROM Scores
ORDER BY Degree DESC
LIMIT 1;
11. Inquire about the average score of the '3-105' course.
SELECT AVG(Degree)
FROM Scores
WHERE Cno='3-105';
12. Look up the average scores of courses starting with 3 that have at least 5 students taking courses in the Score table.
SELECT Cno,AVG(Degree)
FROM Scores
WHERE Cno LIKE '3%'
GROUP BY Cno
HAVING COUNT(Sno) >= 5;
13. Query the Sno column with the lowest score greater than 70 and the highest score less than 90.
SELECT Sno
FROM Scores
GROUP BY Sno
HAVING MAX(Degree)<90 AND MIN(Degree)>70;
14. Query the Sname, Cno and Degree columns of all students.
SELECT Sname,Cno,Degree
FROM Students INNER JOIN Scores
ON(Students.Sno=Scores.Sno)
ORDER BY Sname;
15. Query the Sno, Cname and Degree columns for all students.
SELECT Sno,Cname,Degree
FROM Scores INNER JOIN Courses
ON(Scores.Cno=Courses.Cno)
ORDER BY Sno;
16. Query the Sname, Cname and Degree columns of all students.
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. Inquire about the average score of the selected courses of "95033" class.
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. Suppose a grade table is created with the following command:
CREATE TABLE grade(low TINYINT,upp TINYINT,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');
Now query the Sno, Cno and rank columns of all students.
SELECT Sno,Cno,rank
FROM Scores INNER JOIN grade
ON(Scores.Degree>=grade.low AND Scores.Degree<=grade.upp)
ORDER BY Sno;
19. Query the records of all students whose grades in the elective "3-105" course are higher than those of the "109" student.
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. Query the records of students who have taken more than one course in the score and their scores are not the highest scores.
SELECT *
FROM Scores
GROUP BY Sno
HAVING COUNT(cno)>1 AND Degree!=MAX(Degree);
21. Query all records whose grades are higher than the grades with the student number "109" and the course number "3-105".
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. Query the Sno, Sname and Sbirthday columns of all students born in the same year as the classmate whose student number is 108.
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. Check the grades of students taught by the teacher "Zhang Xu".
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. Query the names of teachers who have more than 5 students enrolled in a certain course.
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. Check the records of all students in class 95033 and 95031.
SELECT *
FROM Students
WHERE Class IN ('95033','95031')
ORDER BY Class;
26. Inquire about the Cno of courses with grades above 85.
SELECT DISTINCT Cno
FROM Scores
WHERE Degree>85;
27. Check out the grade sheet of the courses taught by the teachers of the "Computer Department".
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. Query the Tname and Prof of teachers with different titles of "Department of Computer" and "Department of Electronic Engineering".
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');