数据结构练习题

一、设有一数据库，包括四个表：学生表（Student）、课程表（Course）、成绩表（Score）以及教师信息表（Teacher）。

四个表的结构分别如表1-1的表（一）~表（四）所示，数据如表1-2的表（一）~表（四）所示。

用SQL语句创建四个表并完成相关题目。

表结构如下：

表（一）Student (学生use)

表（二）Course（课程表）

 

表（三）Score(成绩表)

 

表（四）Teacher(教师表)

二、数据库数据：

表（一）Student (学生use)

表（二）Course（课程表）

表（三）Score(成绩表)

表（四）Teacher(教师表)

建表：

-- 学生表
CREATE TABLE student(
    sno VARCHAR(20) NOT NULL PRIMARY KEY,
    sname VARCHAR(20) NOT NULL,
    ssex VARCHAR(20) NOT NULL,
    sbirthday DATE,
    class VARCHAR(20)
)
-- 教师表
CREATE TABLE teacher(
    tno VARCHAR(20) NOT NULL PRIMARY KEY,
    tname VARCHAR(20) NOT NULL,
    tsex VARCHAR(20) NOT NULL,
    tbirthday DATE,
    prof VARCHAR(20),
    depart VARCHAR(20) NOT NULL

)

-- 课程表
CREATE TABLE course(
    cno VARCHAR(20)  PRIMARY KEY NOT NULL ,
    cname VARCHAR(20) NOT NULL,
    tno VARCHAR(20) NOT NULL ,
    CONSTRAINT course_teacher_fk FOREIGN KEY(tno)
    REFERENCES teacher(tno)
    
)
-- 成绩表
CREATE TABLE score(
    sno VARCHAR(20) NOT NULL,
    CONSTRAINT score_student_fk FOREIGN KEY(sno)
    REFERENCES student(sno),
    cno VARCHAR(20) NOT NULL ,
    CONSTRAINT score_course_fk FOREIGN KEY(cno)
    REFERENCES course(cno),
    degree DECIMAL(4,1) 
    
)
-- student
INSERT INTO student VALUES(\'108\',\'曾华\',\'男\',\'19770901\',\'95033\');
INSERT INTO student VALUES(\'105\',\'匡明\',\'男\',\'19751002\',\'95031\');
INSERT INTO student VALUES(\'107\',\'王丽\',\'女\',\'19760123\',\'95033\');
INSERT INTO student VALUES(\'101\',\'李军\',\'男\',\'19760220\',\'95033\');
INSERT INTO student VALUES(\'109\',\'王芳\',\'女\',\'19750210\',\'95031\');
INSERT INTO student VALUES(\'103\',\'陆君\',\'男\',\'19740603\',\'95031\');
SELECT * FROM student;
-- teacher 
INSERT INTO teacher VALUES(\'804\',\'李诚\',\'男\',\'19581202\',\'副教授\',\'计算机系\');
INSERT INTO teacher VALUES(\'856\',\'张旭\',\'男\',\'19690312\',\'讲师\',\'电子工程系\');
INSERT INTO teacher VALUES(\'825\',\'王萍\',\'女\',\'19720505\',\'助教\',\'计算机系\');
INSERT INTO teacher VALUES(\'831\',\'刘冰\',\'女\',\'19770814\',\'助教\',\'电子工程系\');
SELECT * FROM teacher;
-- course
INSERT INTO course VALUES(\'3-105\',\'计算机导论\',\'825\');
INSERT INTO course VALUES(\'3-245\',\'操作系统\',\'804\');
INSERT INTO course VALUES(\'6-166\',\'数字电路\',\'856\');
INSERT INTO course VALUES(\'9-888\',\'高等数学\',\'831\');
SELECT * FROM course;
-- score
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(\'101\',\'3-105\',64);
INSERT INTO score VALUES(\'107\',\'3-105\',91);
INSERT INTO score VALUES(\'108\',\'3-105\',78);
INSERT INTO score VALUES(\'101\',\'6-166\',85);
INSERT INTO score VALUES(\'107\',\'6-166\',79);
INSERT INTO score VALUES(\'108\',\'6-166\',81);
SELECT * FROM score;
-- 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 teacher;
-- 3、查询Student表的所有记录。
SELECT * FROM student;
-- 4、 查询Score表中成绩在60到80之间的所有记录。
SELECT * FROM score WHERE degree>=60 AND degree<=80;
-- 5、查询Score表中成绩为85，86或88的记录。
SELECT * FROM score WHERE degree=85 OR degree=86 OR degree=88;
-- 6、查询Student表中“95031”班或性别为“女”的同学记录。
SELECT * FROM student WHERE class=95032 OR ssex=\'女\';
-- 7、以Class降序查询Student表的所有记录。
SELECT * FROM student ORDER BY class DESC;
-- 8、以Cno升序、Degree降序查询Score表的所有记录。
SELECT * FROM score ORDER BY cno ASC,degree DESC;
-- 9、查询“95031”班的学生人数。
SELECT COUNT(*) FROM student 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 score WHERE degree=(SELECT MAX(degree)FROM score);
-- 11、 查询每门课的平均成绩。
SELECT cno,AVG(degree)FROM score GROUP BY cno;
-- 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 score WHERE cno LIKE \'3%\' AND 
cno=(SELECT cno FROM score GROUP BY cno HAVING COUNT(*)>=5);
-- 13、查询分数大于70，小于90的Sno列。
SELECT sno FROM score WHERE degree>70 AND degree<90;
-- 14、查询所有学生的Sname、Cno和Degree列。
SELECT sname,cno,degree FROM student JOIN score ON student.sno=score.sno;
-- 15、查询所有学生的Sno、Cname和Degree列。
SELECT sno,cname,degree FROM course JOIN score ON course.cno=score.cno;
-- 16、查询所有学生的Sname、Cname和Degree列。
SELECT sname,cname,degree FROM student
JOIN score ON student.sno=score.sno
JOIN course ON score.cno=course.cno;
-- 17、 查询“95033”班学生的平均分。
SELECT AVG(degree) FROM student JOIN score ON student.sno=score.sno WHERE class=\'95033\';
-- 18、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 * FROM student JOIN score ON student.sno=score.sno WHERE cno=\'3-105\' 
AND degree>(SELECT degree FROM score WHERE cno=\'3-105\' AND sno=109);
-- 20、查询score中选学多门课程的同学中分数为非最高分成绩的记录。
SELECT * FROM score a WHERE sno IN(SELECT sno FROM score GROUP BY sno HAVING COUNT(sno)>1)
AND degree <> (SELECT MAX(degree)FROM score b WHERE a.cno=b.cno);
-- 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 degree FROM score WHERE degree>(SELECT degree FROM score WHERE sno=109 AND cno=\'3-105\');
-- 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 sno,sname,sbirthday FROM student WHERE sbirthday LIKE CONCAT((SELECT LEFT((SELECT sbirthday FROM student WHERE sno = 108),4)),\'%\');
-- 23、查询“张旭“教师任课的学生成绩（姓名）
SELECT sname,degree FROM student 
JOIN score ON student.sno=score.sno JOIN course ON score.cno=course.cno 
WHERE cname=(SELECT cname FROM course JOIN teacher ON course.tno=teacher.tno WHERE tname=\'张旭\');
-- 24、查询考计算机导论的学生成绩
SELECT sname,degree FROM student JOIN score ON student.sno=score.sno JOIN course ON score.cno=course.cno WHERE cname=\'计算机导论\';
-- 25、查询李诚老师教的课程名称
SELECT cname FROM course JOIN teacher ON course.tno = teacher.tno WHERE tname = \'李诚\';
-- 26、教高等数学的老师是哪个系的
SELECT depart FROM course JOIN teacher ON course.tno = teacher.tno WHERE cname = \'高等数学\';
-- 27、查询选修某课程的同学人数多于5人的教师姓名。
SELECT tname FROM teacher WHERE tno=(SELECT tno FROM course WHERE cno=(SELECT cno FROM Score GROUP BY cno HAVING COUNT(cno)>5));
-- 28、查询95033班和95031班全体学生的记录。
SELECT * FROM student
JOIN score ON student.sno=score.sno
JOIN course ON score.cno=course.cno 
JOIN teacher ON course.tno=teacher.tno
WHERE class=\'95033\' OR class=\'95031\';
-- 29、查询存在有85分以上成绩的课程Cno.
SELECT cno FROM score WHERE degree>85
-- 30、查询出“计算机系“教师所教课程的成绩表。
SELECT degree FROM score WHERE cno IN(SELECT cno FROM teacher JOIN course ON course.tno=teacher.tno WHERE depart=\'计算机系\')
-- 31、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。
SELECT cno,sno,degree FROM score WHERE cno=\'3-105\' AND degree>(SELECT MIN(degree)FROM score WHERE cno=\'3-245\')ORDER BY degree DESC;
SELECT cno,sno,degree FROM score WHERE degree>ANY(SELECT degree FROM score WHERE cno=\'3-245\') AND cno=\'3-105\' ORDER BY degree DESC;
-- any->表示任意一个
-- all->表示所有
-- 32、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.
SELECT cno,sno,degree FROM score WHERE cno=\'3-105\' AND degree>(SELECT MAX(degree)FROM score WHERE cno=\'3-245\');
SELECT cno,sno,degree FROM score WHERE degree>ALL(SELECT degree FROM score WHERE cno=\'3-245\') AND cno=\'3-105\' ORDER BY degree DESC;
-- 33、查询所有教师和同学的name、sex和birthday.
SELECT sname AS\'name\',ssex AS\'sex\',sbirthday AS\'birthday\' FROM student
UNION
SELECT tname AS\'name\',tsex AS\'sex\',tbirthday AS\'birthday\' FROM teacher;
-- 34、查询所有“女”教师和“女”同学的name、sex和birthday.
SELECT sname AS\'name\',ssex AS\'sex\',sbirthday AS\'birthday\' FROM student WHERE ssex=\'女\'
UNION
SELECT tname AS\'name\',tsex AS\'sex\',tbirthday AS\'birthday\' FROM teacher WHERE tsex=\'女\';
-- 35、查询成绩比该课程平均成绩低的同学的成绩表。
SELECT * FROM score a WHERE a.degree<(SELECT AVG(degree) FROM score b WHERE b.cno=a.cno);
-- 36、 查询所有任课教师的Tname和Depart.
SELECT tname,depart FROM teacher;
-- 37、查询所有未讲课的教师的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);
-- 38、查询至少有2名男生的班号
SELECT class FROM student WHERE ssex=\'男\'GROUP BY Class HAVING COUNT(class)>1;
-- 39、查询Student表中不姓“王”的同学记录。
SELECT * FROM student WHERE sname NOT LIKE\'王%\';
-- 40、查询Student表中每个学生的姓名和年龄。
SELECT sname,YEAR(NOW())-YEAR(sbirthday) AS \'年龄\' FROM student;
-- 41、查询Student表中最大和最小的Sbirthday日期值。
SELECT MAX(sbirthday),MIN(sbirthday) FROM student;
-- 42、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 student ORDER BY class DESC,sbirthday ASC;
-- 43、查询“男”教师及其所上的课程。
SELECT tname,cname FROM course JOIN teacher ON course.tno = teacher.tno WHERE tsex = \'男\'; 
-- 44、查询最高分同学的Sno、Cno和Degree列。
SELECT sno,cno,degree FROM score WHERE degree=(SELECT MAX(degree) FROM score);
-- 45、查询和“李军”同性别的所有同学的Sname.
SELECT sname FROM student WHERE ssex=(SELECT ssex FROM student WHERE sname=\'李军\') AND sname NOT IN (\'李军\');
-- 46、查询和“李军”同性别并同班的同学Sname.
SELECT sname FROM student WHERE ssex=(SELECT ssex FROM student WHERE sname=\'李军\') 
AND class=(SELECT class FROM student WHERE sname=\'李军\') 
AND sname NOT IN (\'李军\');
-- 47、查询所有选修“计算机导论”课程的“男”同学的成绩表。
SELECT sname,degree FROM student
JOIN score ON student.sno=score.sno
JOIN course ON score.cno=course.cno WHERE cname=\'计算机导论\' AND ssex=\'男\';