mysql查詢練習題

設有一資料庫，包括四個表：學生表（Student）、課程表（Course）、成績表（Score）以及教師資訊表（Teacher）。表結構及資料如下，請完成題目。

#建學生資訊表student
sno varchar(20) not null primary key,
sname varchar(20) not null,
ssex varchar(20) not null,
sbirthday datetime,
class varchar(20)
#建立教師表

tno varchar(20) not null primary key,
tname varchar(20) not null,
tsex varchar(20) not null,
tbirthday datetime,
prof varchar(20),
depart varchar(20) not null
#建立課程表course

cno varchar(20) not null primary key,
cname varchar(20) not null,
tno varchar(20) not null,
foreign key(tno) references teacher(tno)
#建立成績表

sno varchar(20) not null,
foreign key(sno) references student(sno),
cno varchar(20) not null,
foreign key(cno) references course(cno),
degree decimal,
primary key(sno,cno)
#新增學生資訊
insert into student values('108','曾華','男','1977-09-01','95033');
insert into student values('105','匡明','男','1975-10-02','95031');
insert into student values('107','王麗','女','1976-01-23','95033');
insert into student values('101','李軍','男','1976-02-20','95033');
insert into student values('109','王芳','女','1975-02-10','95031');
insert into student values('103','陸君','男','1974-06-03','95031');
#新增教師表
insert into teacher values('804','李誠','男','1958-12-02','副教授','計算機系');
insert into teacher values('856','張旭','男','1969-03-12','講師','電子工程系');
insert into teacher values('825','王萍','女','1972-05-05','助教','計算機系');
insert into teacher values('831','劉冰','女','1977-08-14','助教','電子工程系');
#新增課程表
insert into course values('3-105','計算機導論','825');
insert into course values('3-245','作業系統','804');
insert into course values('6-166','數位電路','856');
insert into course values('9-888','高等數學','831');
#新增成績表
insert into score values('103','3-245','86');
insert into score values('105','3-245','75');
insert into score values('109','3-245','68');
insert into score values('103','3-105','92');
insert into score values('105','3-105','88');
insert into score values('109','3-105','76');
insert into score values('103','6-166','85');
insert into score values('105','6-166','79');
insert into score values('109','6-166','81');

1、 查詢Student表中的所有記錄的Sname、Ssex和Class列。

	SELECT student.sname, student.ssex, student.class FROM student;

2、 查詢教師所有的單位即不重複的Depart列。

	SELECT teacher.depart FROM teacher GROUP BY teacher.depart;
	
	SELECT DISTINCT teacher.depart FROM teacher;

3、 查詢Student表的所有記錄。

	SELECT * FROM student;

4、 查詢Score表中成績在60到80之間的所有記錄。

	SELECT * FROM score WHERE score.degree >= 60 AND score.degree <= 80;

5、 查詢Score表中成績為85，86或88的記錄。

	SELECT * FROM score WHERE score.degree = 85 OR score.degree = 86 OR score.degree = 88;

6、 查詢Student表中“95031”班或性別為“女”的同學記錄。
	
	SELECT * FROM student WHERE student.class = 95031 OR student.ssex = 女;
	
7、 以Class降序查詢Student表的所有記錄。

	SELECT * FROM student ORDER BY student.class DESC;

8、 以Cno升序、Degree降序查詢Score表的所有記錄。

	SELECT * FROM score ORDER BY score.cno ASC, score.degree DESC;

9、 查詢“95031”班的學生人數。
	
	SELECT student.class, count(*) FROM student GROUP BY student.class HAVING student.class = 95031;

10、查詢Score表中的最高分的學生學號和課程號。（子查詢或者排序）
	
SELECT
	score.sno,
	score.cno
FROM
	score
WHERE
	score.degree = (SELECT MAX(degree) FROM score)

11、 查詢每門課的平均成績。

	SELECT Avg(score.degree), score.cno FROM score GROUP BY score.cno;

12、查詢Score表中至少有2名學生選修的並以3開頭的課程的平均分數。
	
SELECT
	Avg(score.degree),
	Count(score.cno),
	score.cno
FROM
	score
GROUP BY
	score.cno
HAVING
	Count(score.cno) >= 2
AND score.cno LIKE '3%'

13、查詢分數大於70，小於90的Sno列。

	SELECT score.sno FROM score WHERE score.degree > 70 AND score.degree < 90;

14、查詢所有學生的Sname、Cno和Degree列。

	 SELECT student.sname, course.cno, score.degree FROM student LEFT JOIN score ON score.sno = student.sno LEFT JOIN course ON score.cno = course.cno;
	 
	 select Sname,Cno,Degree from student join Score on student.Sno=Score.Sno;

15、查詢所有學生的Sno、Cname和Degree列。
	
	SELECT student.sno, course.cname, score.degree FROM student LEFT JOIN score ON score.sno = student.sno LEFT JOIN course ON score.cno = course.cno;
	
	select Sno,Cname,degree from Score join Course on Course.Cno=Score.Cno;
	
16、查詢所有學生的Sname、Cname和Degree列。 

	SELECT student.sname, course.cname, score.degree FROM student LEFT JOIN score ON score.sno = student.sno LEFT JOIN course ON score.cno = course.cno;

17、查詢“95033”班學生的平均分。

	SELECT Avg(score.degree) FROM student INNER JOIN score ON score.sno = student.sno WHERE student.class = 95033;

18、 假設使用如下命令建立了一個grade表：
create table grade(low  int(3),upp  int(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’)

現查詢所有同學的Sno、Cno和rank列。

	SELECT score.sno, score.cno, grade.rank FROM score INNER JOIN grade ON score.degree >= grade.low AND score.degree <= grade.upp;

19、查詢選修“3-105”課程的成績高於“109”號同學成績的所有同學的記錄。

	SELECT * FROM student INNER JOIN score ON score.sno = student.sno INNER JOIN course ON score.cno = course.cno 
	AND course.cno = '3-105' AND score.degree > (SELECT score.degree FROM score WHERE score.sno=109 AND score.cno='3-105');

21、查詢成績高於學號為“109”、課程號為“3-105”的成績的所有記錄。

SELECT
	*
FROM
	student,
	Score
WHERE
	student.Sno = Score.Sno
AND Score.Degree > (
	SELECT
		Degree
	FROM
		Score
	WHERE
		Cno = '3-105'
	AND Sno = '109'
);

22、查詢和學號為108、101的同學同年出生的所有學生的Sno、Sname和Sbirthday列。

SELECT
	student.sno,
	student.sname,
	student.sbirthday
FROM
	student
WHERE
	YEAR (sbirthday) = (
		SELECT
			YEAR (sbirthday)
		FROM
			student
		WHERE
			student.sno = 108
		OR student.sno = 101
	)

23、查詢“張旭“教師任課的學生成績。
		
	SELECT score.degree FROM score INNER JOIN teacher ON teacher.tname = '張旭' INNER JOIN course ON course.tno = teacher.tno AND score.cno = course.cno;
	

24、查詢選修某課程的同學人數多於5人的教師姓名。

	SELECT teacher.tname, Count(teacher.tno) FROM teacher INNER JOIN course ON course.tno = teacher.tno 
	INNER JOIN score ON score.cno = course.cno GROUP BY course.cno HAVING Count(teacher.tno) > 5;

25、查詢95033班和95031班全體學生的記錄。

	SELECT * FROM student WHERE student.class = 95033 OR student.class = 95031;

26、 查詢存在有85分以上成績的課程Cno。

	SELECT score.cno FROM score where score.degree > 85;

27、查詢出“計算機系“教師所教課程的成績表。

SELECT
	score.sno,
	score.cno,
	score.degree
FROM
	score
INNER JOIN course ON score.cno = course.cno
INNER JOIN teacher ON course.tno = teacher.tno
AND teacher.depart = '計算機系';
	
	
SELECT
	sno,
	Cno,
	Degree
FROM
	Score
WHERE
	Cno IN (
		SELECT
			Cno
		FROM
			Course
		WHERE
			Tno IN (
				SELECT
					tno
				FROM
					Teacher
				WHERE
					Depart = '計算機系'
			)
	)

28、查詢“計算 機系”與“電子工程系“不同職稱的教師的Tname和Prof。

SELECT
	Tname,
	Prof
FROM
	Teacher a
WHERE
	Prof NOT IN (
		SELECT
			Prof
		FROM
			Teacher b
		WHERE
			a.Depart != b.Depart
	);

29、查詢選修編號為“3-105“課程且成績至少高於選修編號為“3-245”的同學的Cno、Sno和Degree,並按Degree從高到低次序排序。

SELECT
	Cno,
	Sno,
	Degree
FROM
	Score a
WHERE
	(
		SELECT
			Degree
		FROM
			Score b
		WHERE
			Cno = '3-105'
		AND b.Sno = a.Sno
	) >= (
		SELECT
			Degree
		FROM
			Score c
		WHERE
			Cno = '3-245'
		AND c.Sno = a.Sno
	)
ORDER BY
	Degree DESC;

30、查詢選修編號為“3-105”且成績高於選修編號為“3-245”課程的同學的Cno、Sno和Degree。

SELECT
	Cno,
	Sno,
	Degree
FROM
	Score a
WHERE
	(
		SELECT
			Degree
		FROM
			Score b
		WHERE
			Cno = '3-105'
		AND b.Sno = a.Sno
	) > (
		SELECT
			Degree
		FROM
			Score c
		WHERE
			Cno = '3-245'
		AND c.Sno = a.Sno
	);

31、 查詢所有教師和同學的name、sex和birthday。

	select distinct Sname as name,Ssex as sex,sbirthday as birthday from student
	union
	select distinct Tname as name,Tsex as sex,tbirthday as birthday from Teacher

32、查詢所有“女”教師和“女”同學的name、sex和birthday。

	select distinct Sname as name,Ssex as sex,sbirthday as birthday from student
	WHERE ssex='女'
	union
	select distinct Tname as name,Tsex as sex,tbirthday as birthday from Teacher
	WHERE tsex='女';

33、 查詢成績比該課程平均成績低的同學的成績表。

SELECT
	Sno,
	Cno,
	Degree
FROM
	Score a
WHERE
	a.Degree < (
		SELECT
			AVG(Degree)
		FROM
			Score b
		WHERE
			a.Cno = b.Cno
	)

34、 查詢所有任課教師的Tname和Depart。

SELECT
	Tname,
	Depart
FROM
	Teacher
WHERE
	Tname IN (
		SELECT DISTINCT
			Tname
		FROM
			Teacher,
			Course,
			Score
		WHERE
			Teacher.Tno = Course.Tno
		AND Course.Cno = Score.Cno
	)

35 、查詢所有未講課的教師的Tname和Depart。

SELECT
	Tname,
	Depart
FROM
	Teacher
WHERE
	Tname NOT IN (
		SELECT DISTINCT
			Tname
		FROM
			Teacher,
			Course,
			Score
		WHERE
			Teacher.Tno = Course.Tno
		AND Course.Cno = Score.Cno
	)

36、查詢至少有2名男生的班號。

	SELECT student.class FROM student WHERE student.ssex = '男' GROUP BY student.class HAVING count(*) >= 2;

37、查詢Student表中不姓“王”的同學記錄。

	SELECT * FROM student WHERE student.sname NOT LIKE '王%';

38、查詢Student表中每個學生的姓名和年齡。

SELECT
	student.sname,
	YEAR (NOW()) - YEAR (sbirthday) as age
FROM
	student;

39、查詢Student表中最大和最小的Sbirthday日期值。

	SELECT Max(student.sbirthday), Min(student.sbirthday) FROM student;

40、以班號和年齡從大到小的順序查詢Student表中的全部記錄。

SELECT
	*
FROM
	student
ORDER BY
	student.class DESC,
	YEAR(NOW())-YEAR(sbirthday)DESC;

41、查詢“男”教師及其所上的課程。

	SELECT course.cname FROM teacher LEFT JOIN course ON course.tno = teacher.tno WHERE teacher.tsex = '男';
	
42、查詢最高分同學的Sno、Cno和Degree列。

	SELECT score.sno, score.cno, score.degree FROM score WHERE score.degree = (SELECT Max(score.degree) FROM score);

43、查詢和“李軍”同性別的所有同學的Sname。

	SELECT student.sname FROM student WHERE student.ssex = (SELECT ssex FROM student WHERE sname='李軍') AND '李軍' NOT IN ( student.sname);

44、查詢和“李軍”同性別並同班的同學Sname。

	SELECT student.sname FROM student WHERE student.ssex = (SELECT ssex FROM student WHERE sname='李軍') AND student.class=(SELECT class FROM student WHERE sname='李軍')
	AND '李軍' NOT IN ( student.sname);

45、查詢所有選修“計算機導論”課程的“男”同學的成績表。

	SELECT score.sno,score.cno,score.degree FROM score INNER JOIN course ON score.cno = course.cno INNER JOIN student ON score.sno = student.sno 
	WHERE student.ssex = '男' AND course.cname =  '計算機導論';	

46、查詢學習過3-105並且也學過3-245的同學學號、姓名。

SELECT
	student.sno,
	student.sname
FROM
student
WHERE
student.sno in
(
		SELECT
			score.sno
		FROM
			score
		WHERE
			score.cno = '3-105'
	)
and student.sno in(
	SELECT
		score.sno
	FROM
		score
	WHERE
		score.cno = '3-245'
)

	
47、查詢所有課程成績均小於85分的學生學號、姓名。

	SELECT student.sno, student.sname FROM student INNER JOIN score ON score.sno =student.sno WHERE score.degree < 85 
	GROUP BY score.sno HAVING count(student.sno) = 2;
	
	SELECT student.sno, student.sname FROM student INNER JOIN score ON score.sno =student.sno
	GROUP BY score.sno HAVING  MAX(score.degree) < 85 ;