【轉載】【SQL練習】經典SQL練習題

出處 https://blog.csdn.net/mrbcy/article/details/68965271

準備數據

建表語句

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)

插入數據

INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (108 ,'曾華' ,'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 ,'王麗' ,'女' ,'1976-01-23',95033);
INSERT INTO STUDENTS (SNO,SNAME,SSEX,SBIRTHDAY,CLASS) VALUES (101 ,'李軍' ,'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 ,'陸君' ,'男' ,'1974-06-03',95031);

INSERT INTO COURSES(CNO,CNAME,TNO)VALUES ('3-105' ,'計算機導論',825);
INSERT INTO COURSES(CNO,CNAME,TNO)VALUES ('3-245' ,'操做系統' ,804);
INSERT INTO COURSES(CNO,CNAME,TNO)VALUES ('6-166' ,'數據電路' ,856);
INSERT INTO COURSES(CNO,CNAME,TNO)VALUES ('9-888' ,'高等數學' ,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,'李誠','男','1958-12-02','副教授','計算機系');
INSERT INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (856,'張旭','男','1969-03-12','講師','電子工程系');
INSERT INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (825,'王萍','女','1972-05-05','助教','計算機系');
INSERT INTO TEACHERS(TNO,TNAME,TSEX,TBIRTHDAY,PROF,DEPART) VALUES (831,'劉冰','女','1977-08-14','助教','電子工程系');

題目

一、 查詢Student表中的全部記錄的Sname、Ssex和Class列。
二、 查詢教師全部的單位即不重複的Depart列。
三、 查詢Student表的全部記錄。
四、 查詢Score表中成績在60到80之間的全部記錄。
五、 查詢Score表中成績爲85，86或88的記錄。
六、 查詢Student表中「95031」班或性別爲「女」的同窗記錄。
七、 以Class降序查詢Student表的全部記錄。
八、 以Cno升序、Degree降序查詢Score表的全部記錄。
九、 查詢「95031」班的學生人數。
十、查詢Score表中的最高分的學生學號和課程號。
十一、查詢‘3-105’號課程的平均分。
十二、查詢Score表中至少有5名學生選修的並以3開頭的課程的平均分數。
1三、查詢最低分大於70，最高分小於90的Sno列。
1四、查詢全部學生的Sname、Cno和Degree列。
1五、查詢全部學生的Sno、Cname和Degree列。
1六、查詢全部學生的Sname、Cname和Degree列。
1七、查詢「95033」班所選課程的平均分。
1八、假設使用以下命令創建了一個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;
現查詢全部同窗的Sno、Cno和rank列。
1九、查詢選修「3-105」課程的成績高於「109」號同窗成績的全部同窗的記錄。
20、查詢score中選學一門以上課程的同窗中分數爲非最高分紅績的記錄。
2一、查詢成績高於學號爲「109」、課程號爲「3-105」的成績的全部記錄。
2二、查詢和學號爲108的同窗同年出生的全部學生的Sno、Sname和Sbirthday列。
2三、查詢「張旭「教師任課的學生成績。
2四、查詢選修某課程的同窗人數多於5人的教師姓名。
2五、查詢95033班和95031班全體學生的記錄。
2六、查詢存在有85分以上成績的課程Cno.
2七、查詢出「計算機系「教師所教課程的成績表。
2八、查詢「計算機系」與「電子工程系「不一樣職稱的教師的Tname和Prof。
2九、查詢選修編號爲「3-105「課程且成績至少高於選修編號爲「3-245」的同窗的Cno、Sno和Degree,並按Degree從高到低次序排序。
30、查詢選修編號爲「3-105」且成績高於選修編號爲「3-245」課程的同窗的Cno、Sno和Degree.
3一、查詢全部教師和同窗的name、sex和birthday.
3二、查詢全部「女」教師和「女」同窗的name、sex和birthday.
3三、查詢成績比該課程平均成績低的同窗的成績表。
3四、查詢全部任課教師的Tname和Depart.
35  查詢全部未講課的教師的Tname和Depart. 
3六、查詢至少有2名男生的班號。
3七、查詢Student表中不姓「王」的同窗記錄。
3八、查詢Student表中每一個學生的姓名和年齡。
3九、查詢Student表中最大和最小的Sbirthday日期值。
40、以班號和年齡從大到小的順序查詢Student表中的所有記錄。
4一、查詢「男」教師及其所上的課程。
4二、查詢最高分同窗的Sno、Cno和Degree列。
4三、查詢和「李軍」同性別的全部同窗的Sname.
4四、查詢和「李軍」同性別並同班的同窗Sname.
4五、查詢全部選修「計算機導論」課程的「男」同窗的成績表

1.查詢Student表中的全部記錄的Sname、Ssex和Class列。

SELECT Sname,Ssex,Class
FROM Student;

2.查詢教師全部的單位即不重複的Depart列。

SELECT DISTINCT Depart
FROM Teachers;

3.查詢Student表的全部記錄。

SELECT *
FROM Students;

4.查詢Score表中成績在60到80之間的全部記錄。

SELECT *
FROM Scores
WHERE Degree BETWEEN 60 AND 80;

5.查詢Score表中成績爲85，86或88的記錄。

SELECT *
FROM Scores
WHERE Degree IN (85,86,88);

6.查詢Student表中「95031」班或性別爲「女」的同窗記錄。

SELECT *
FROM Students
WHERE Class='95031' OR Ssex='女';

7.以Class降序查詢Student表的全部記錄。

SELECT *
FROM Students
ORDER BY Class DESC;

8.以Cno升序、Degree降序查詢Score表的全部記錄。

SELECT *
FROM Scores
ORDER BY Cno,Degree DESC;

9.查詢「95031」班的學生人數。

SELECT COUNT(1) AS StuNum
FROM Students
WHERE Class='95031';

10.查詢Score表中的最高分的學生學號和課程號。

SELECT Sno,Cno
FROM Scores
ORDER BY Degree DESC
LIMIT 1;

11.查詢‘3-105’號課程的平均分。

SELECT AVG(Degree)
FROM Scores
WHERE Cno='3-105';

12.查詢Score表中至少有5名學生選修的並以3開頭的課程的平均分數。

SELECT Cno,AVG(Degree)
FROM Scores
WHERE Cno LIKE '3%'
GROUP BY Cno
HAVING COUNT(Sno) >= 5;

13.查詢最低分大於70，最高分小於90的Sno列。

SELECT Sno
FROM Scores
GROUP BY Sno
HAVING MAX(Degree)<90 AND MIN(Degree)>70;

14.查詢全部學生的Sname、Cno和Degree列。

SELECT Sname,Cno,Degree
FROM Students INNER JOIN Scores 
ON(Students.Sno=Scores.Sno)
ORDER BY Sname;

15.查詢全部學生的Sno、Cname和Degree列。

SELECT Sno,Cname,Degree
FROM Scores INNER JOIN Courses
ON(Scores.Cno=Courses.Cno)
ORDER BY Sno;

16.查詢全部學生的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.查詢「95033」班所選課程的平均分。

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.假設使用以下命令創建了一個grade表：

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');

現查詢全部同窗的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.查詢選修「3-105」課程的成績高於「109」號同窗成績的全部同窗的記錄。

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.查詢score中選學一門以上課程的同窗中分數爲非最高分紅績的記錄。

SELECT *
FROM Scores
GROUP BY Sno
HAVING COUNT(cno)>1 AND Degree!=MAX(Degree);

21.查詢成績高於學號爲「109」、課程號爲「3-105」的成績的全部記錄。

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.查詢和學號爲108的同窗同年出生的全部學生的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.查詢「張旭「教師任課的學生成績。

SELECT Sno,Degree
FROM Scores INNER JOIN Courses
ON(Scores.Cno=Courses.Cno) INNER JOIN Teachers
ON(Courses.Tno=Teachers.Tno)
WHERE Teachers.Tname='張旭';

24.查詢選修某課程的同窗人數多於5人的教師姓名。

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.查詢95033班和95031班全體學生的記錄。

SELECT *
FROM Students
WHERE Class IN ('95033','95031')
ORDER BY Class;

26.查詢存在有85分以上成績的課程Cno.

SELECT DISTINCT Cno
FROM Scores
WHERE Degree>85;

27.查詢出「計算機系「教師所教課程的成績表。

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='計算機系'
ORDER BY Tname,Cname,Degree DESC;

28.查詢「計算機系」與「電子工程系「不一樣職稱的教師的Tname和Prof。

SELECT Tname,Prof
FROM Teachers
WHERE Depart='計算機系' AND Prof NOT IN(
    SELECT DISTINCT Prof
    FROM Teachers
    WHERE Depart='電子工程系');

29.查詢選修編號爲「3-105「課程且成績至少高於任意選修編號爲「3-245」的同窗的成績的Cno、Sno和Degree,並按Degree從高到低次序排序。

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.查詢選修編號爲「3-105」且成績高於全部選修編號爲「3-245」課程的同窗的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.查詢全部教師和同窗的name、sex和birthday.

SELECT Sname,Ssex,Sbirthday
FROM Students
UNION
SELECT Tname,Tsex,Tbirthday
FROM Teachers;

32.查詢全部「女」教師和「女」同窗的name、sex和birthday.

SELECT Sname,Ssex,Sbirthday
FROM Students
WHERE Ssex='女'
UNION
SELECT Tname,Tsex,Tbirthday
FROM Teachers
WHERE Tsex='女';

33.查詢成績比該課程平均成績低的同窗的成績表。

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.查詢全部任課教師的Tname和Depart.

SELECT Tname,Depart
FROM Teachers
WHERE Tno IN(
    SELECT Tno
    FROM Courses
);

35.查詢全部未講課的教師的Tname和Depart.

SELECT Tname,Depart
FROM Teachers
WHERE Tno NOT IN(
    SELECT Tno
    FROM Courses
);

36.查詢至少有2名男生的班號。

SELECT Class,COUNT(1) AS boyCount
FROM Students
WHERE Ssex='男'
GROUP BY Class
HAVING boyCount>=2;

37.查詢Student表中不姓「王」的同窗記錄。

SELECT *
FROM Students
WHERE Sname NOT LIKE '王%';

38.查詢Student表中每一個學生的姓名和年齡。

SELECT Sname,YEAR(NOW())-YEAR(Sbirthday) AS Sage
FROM Students;

39.查詢Student表中最大和最小的Sbirthday日期值。

SELECT MIN(Sbirthday),MAX(Sbirthday)
FROM Students;

40.以班號和年齡從大到小的順序查詢Student表中的所有記錄。

SELECT *
FROM Students
ORDER BY Class DESC,Sbirthday ASC;

41.查詢「男」教師及其所上的課程。

SELECT Teachers.Tname,Courses.Cname
FROM Teachers INNER JOIN Courses
ON(Teachers.Tno=Courses.Tno)
WHERE Teachers.Tsex='男';

42.查詢最高分同窗的Sno、Cno和Degree列。

SELECT *
FROM Scores
GROUP BY Cno
HAVING Degree=Max(Degree);

43.查詢和「李軍」同性別的全部同窗的Sname.

SELECT s1.Sname
FROM Students AS s1 INNER JOIN Students AS s2
ON(s1.Ssex=s2.Ssex)
WHERE s2.Sname='李軍';

44.查詢和「李軍」同性別並同班的同窗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='李軍';

45.查詢全部選修「計算機導論」課程的「男」同窗的成績表

SELECT *
FROM Scores
WHERE Sno IN (
    SELECT Sno
    FROM Students
    WHERE Ssex='男') AND
    Cno IN (
    SELECT Cno
    FROM Courses
    WHERE Cname='計算機導論');