zoukankan      html  css  js  c++  java
  • MySQL练习题

    创建表和插入数据

     

      1 DROP TABLE IF EXISTS `class`;
      2 CREATE TABLE `class` (
      3   `cid` int(11) NOT NULL AUTO_INCREMENT,
      4   `caption` varchar(32) NOT NULL,
      5   PRIMARY KEY (`cid`)
      6 ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
      7 
      8 -- ----------------------------
      9 -- Records of class
     10 -- ----------------------------
     11 INSERT INTO `class` VALUES ('1', '三年二班');
     12 INSERT INTO `class` VALUES ('2', '三年三班');
     13 INSERT INTO `class` VALUES ('3', '一年二班');
     14 INSERT INTO `class` VALUES ('4', '二年九班');
     15 
     16 -- ----------------------------
     17 -- Table structure for course
     18 -- ----------------------------
     19 DROP TABLE IF EXISTS `course`;
     20 CREATE TABLE `course` (
     21   `cid` int(11) NOT NULL AUTO_INCREMENT,
     22   `cname` varchar(32) NOT NULL,
     23   `teacher_id` int(11) NOT NULL,
     24   PRIMARY KEY (`cid`),
     25   KEY `fk_course_teacher` (`teacher_id`),
     26   CONSTRAINT `fk_course_teacher` FOREIGN KEY (`teacher_id`) REFERENCES `teacher` (`tid`)
     27 ) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
     28 
     29 -- ----------------------------
     30 -- Records of course
     31 -- ----------------------------
     32 INSERT INTO `course` VALUES ('1', '生物', '1');
     33 INSERT INTO `course` VALUES ('2', '物理', '2');
     34 INSERT INTO `course` VALUES ('3', '体育', '3');
     35 INSERT INTO `course` VALUES ('4', '美术', '2');
     36 
     37 -- ----------------------------
     38 -- Table structure for score
     39 -- ----------------------------
     40 DROP TABLE IF EXISTS `score`;
     41 CREATE TABLE `score` (
     42   `sid` int(11) NOT NULL AUTO_INCREMENT,
     43   `student_id` int(11) NOT NULL,
     44   `course_id` int(11) NOT NULL,
     45   `num` int(11) NOT NULL,
     46   PRIMARY KEY (`sid`),
     47   KEY `fk_score_student` (`student_id`),
     48   KEY `fk_score_course` (`course_id`),
     49   CONSTRAINT `fk_score_course` FOREIGN KEY (`course_id`) REFERENCES `course` (`cid`),
     50   CONSTRAINT `fk_score_student` FOREIGN KEY (`student_id`) REFERENCES `student` (`sid`)
     51 ) ENGINE=InnoDB AUTO_INCREMENT=53 DEFAULT CHARSET=utf8;
     52 
     53 -- ----------------------------
     54 -- Records of score
     55 -- ----------------------------
     56 INSERT INTO `score` VALUES ('1', '1', '1', '10');
     57 INSERT INTO `score` VALUES ('2', '1', '2', '9');
     58 INSERT INTO `score` VALUES ('5', '1', '4', '66');
     59 INSERT INTO `score` VALUES ('6', '2', '1', '8');
     60 INSERT INTO `score` VALUES ('8', '2', '3', '68');
     61 INSERT INTO `score` VALUES ('9', '2', '4', '99');
     62 INSERT INTO `score` VALUES ('10', '3', '1', '77');
     63 INSERT INTO `score` VALUES ('11', '3', '2', '66');
     64 INSERT INTO `score` VALUES ('12', '3', '3', '87');
     65 INSERT INTO `score` VALUES ('13', '3', '4', '99');
     66 INSERT INTO `score` VALUES ('14', '4', '1', '79');
     67 INSERT INTO `score` VALUES ('15', '4', '2', '11');
     68 INSERT INTO `score` VALUES ('16', '4', '3', '67');
     69 INSERT INTO `score` VALUES ('17', '4', '4', '100');
     70 INSERT INTO `score` VALUES ('18', '5', '1', '79');
     71 INSERT INTO `score` VALUES ('19', '5', '2', '11');
     72 INSERT INTO `score` VALUES ('20', '5', '3', '67');
     73 INSERT INTO `score` VALUES ('21', '5', '4', '100');
     74 INSERT INTO `score` VALUES ('22', '6', '1', '9');
     75 INSERT INTO `score` VALUES ('23', '6', '2', '100');
     76 INSERT INTO `score` VALUES ('24', '6', '3', '67');
     77 INSERT INTO `score` VALUES ('25', '6', '4', '100');
     78 INSERT INTO `score` VALUES ('26', '7', '1', '9');
     79 INSERT INTO `score` VALUES ('27', '7', '2', '100');
     80 INSERT INTO `score` VALUES ('28', '7', '3', '67');
     81 INSERT INTO `score` VALUES ('29', '7', '4', '88');
     82 INSERT INTO `score` VALUES ('30', '8', '1', '9');
     83 INSERT INTO `score` VALUES ('31', '8', '2', '100');
     84 INSERT INTO `score` VALUES ('32', '8', '3', '67');
     85 INSERT INTO `score` VALUES ('33', '8', '4', '88');
     86 INSERT INTO `score` VALUES ('34', '9', '1', '91');
     87 INSERT INTO `score` VALUES ('35', '9', '2', '88');
     88 INSERT INTO `score` VALUES ('36', '9', '3', '67');
     89 INSERT INTO `score` VALUES ('37', '9', '4', '22');
     90 INSERT INTO `score` VALUES ('38', '10', '1', '90');
     91 INSERT INTO `score` VALUES ('39', '10', '2', '77');
     92 INSERT INTO `score` VALUES ('40', '10', '3', '43');
     93 INSERT INTO `score` VALUES ('41', '10', '4', '87');
     94 INSERT INTO `score` VALUES ('42', '11', '1', '90');
     95 INSERT INTO `score` VALUES ('43', '11', '2', '77');
     96 INSERT INTO `score` VALUES ('44', '11', '3', '43');
     97 INSERT INTO `score` VALUES ('45', '11', '4', '87');
     98 INSERT INTO `score` VALUES ('46', '12', '1', '90');
     99 INSERT INTO `score` VALUES ('47', '12', '2', '77');
    100 INSERT INTO `score` VALUES ('48', '12', '3', '43');
    101 INSERT INTO `score` VALUES ('49', '12', '4', '87');
    102 INSERT INTO `score` VALUES ('52', '13', '3', '87');
    103 
    104 -- ----------------------------
    105 -- Table structure for student
    106 -- ----------------------------
    107 DROP TABLE IF EXISTS `student`;
    108 CREATE TABLE `student` (
    109   `sid` int(11) NOT NULL AUTO_INCREMENT,
    110   `gender` char(1) NOT NULL,
    111   `class_id` int(11) NOT NULL,
    112   `sname` varchar(32) NOT NULL,
    113   PRIMARY KEY (`sid`),
    114   KEY `fk_class` (`class_id`),
    115   CONSTRAINT `fk_class` FOREIGN KEY (`class_id`) REFERENCES `class` (`cid`)
    116 ) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;
    117 
    118 -- ----------------------------
    119 -- Records of student
    120 -- ----------------------------
    121 INSERT INTO `student` VALUES ('1', '', '1', '理解');
    122 INSERT INTO `student` VALUES ('2', '', '1', '钢蛋');
    123 INSERT INTO `student` VALUES ('3', '', '1', '张三');
    124 INSERT INTO `student` VALUES ('4', '', '1', '张一');
    125 INSERT INTO `student` VALUES ('5', '', '1', '张二');
    126 INSERT INTO `student` VALUES ('6', '', '1', '张四');
    127 INSERT INTO `student` VALUES ('7', '', '2', '铁锤');
    128 INSERT INTO `student` VALUES ('8', '', '2', '李三');
    129 INSERT INTO `student` VALUES ('9', '', '2', '李一');
    130 INSERT INTO `student` VALUES ('10', '', '2', '李二');
    131 INSERT INTO `student` VALUES ('11', '', '2', '李四');
    132 INSERT INTO `student` VALUES ('12', '', '3', '如花');
    133 INSERT INTO `student` VALUES ('13', '', '3', '刘三');
    134 INSERT INTO `student` VALUES ('14', '', '3', '刘一');
    135 INSERT INTO `student` VALUES ('15', '', '3', '刘二');
    136 INSERT INTO `student` VALUES ('16', '', '3', '刘四');
    137 
    138 -- ----------------------------
    139 -- Table structure for teacher
    140 -- ----------------------------
    141 DROP TABLE IF EXISTS `teacher`;
    142 CREATE TABLE `teacher` (
    143   `tid` int(11) NOT NULL AUTO_INCREMENT,
    144   `tname` varchar(32) NOT NULL,
    145   PRIMARY KEY (`tid`)
    146 ) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;
    147 
    148 -- ----------------------------
    149 -- Records of teacher
    150 -- ----------------------------
    151 INSERT INTO `teacher` VALUES ('1', '张磊老师');
    152 INSERT INTO `teacher` VALUES ('2', '李平老师');
    153 INSERT INTO `teacher` VALUES ('3', '刘海燕老师');
    154 INSERT INTO `teacher` VALUES ('4', '朱云海老师');
    155 INSERT INTO `teacher` VALUES ('5', '李杰老师');
    156 SET FOREIGN_KEY_CHECKS=1;
    插入数据
    1、查询所有的课程的名称以及对应的任课老师姓名
        SELECT cname 课程,tname 老师 from teacher,course WHERE teacher.tid=course.teacher_id;
    +--------+-----------------+
    | 课程   | 老师            |
    +--------+-----------------+
    | 生物   | 张磊老师        |
    | 物理   | 李平老师        |
    | 体育   | 刘海燕老师      |
    | 美术   | 李平老师        |
    +--------+-----------------+
    
    2、查询学生表中男女生各有多少人
       SELECT gender 性别 ,COUNT(gender) 人数 from student GROUP BY gender;
    +--------+--------+
    | 性别   | 人数   |
    +--------+--------+
    ||      6 |
    ||     10 |
    +--------+--------+
       
    3、查询物理成绩等于100的学生的姓名
        SELECT student.sname ,course.cname,score.num FROM score,student,course 
            WHERE num=100 and course_id=2  AND score.student_id=student.sid AND course.cid=score.course_id;
    +--------+--------+-----+
    | sname  | cname  | num |
    +--------+--------+-----+
    | 张四   | 物理   | 100 |
    | 铁锤   | 物理   | 100 |
    | 李三   | 物理   | 100 |
    +--------+--------+-----+
            
    4、查询平均成绩大于八十分的同学的姓名和平均成绩
       SELECT AVG(num),student.sname FROM score,student 
            WHERE score.student_id=student.sid GROUP BY student_id HAVING AVG(num) > 80;
    +----------+--------+
    | AVG(num) | sname  |
    +----------+--------+
    |  82.2500 | 张三   |
    |  87.0000 | 刘三   |
    +----------+--------+
    
    5、查询所有学生的学号,姓名,选课数,总成绩
       SELECT student.sid 学号,COUNT(*) 课程数,student.sname 姓名,SUM(score.num) 总成绩 FROM score,student 
                 WHERE student.sid=score.student_id GROUP BY student_id ORDER BY 学号;
    +--------+-----------+--------+-----------+
    | 学号   | 课程数    | 姓名   | 总成绩    |
    +--------+-----------+--------+-----------+
    |      1 |         3 | 理解   |        85 |
    |      2 |         3 | 钢蛋   |       175 |
    |      3 |         4 | 张三   |       329 |
    |      4 |         4 | 张一   |       257 |
    |      5 |         4 | 张二   |       257 |
    |      6 |         4 | 张四   |       276 |
    |      7 |         4 | 铁锤   |       264 |
    |      8 |         4 | 李三   |       264 |
    |      9 |         4 | 李一   |       268 |
    |     10 |         4 | 李二   |       297 |
    |     11 |         4 | 李四   |       297 |
    |     12 |         4 | 如花   |       297 |
    |     13 |         1 | 刘三   |        87 |
    +--------+-----------+--------+-----------+
    
    6、查询姓李老师的个数
       SELECT count(*) FROM teacher WHERE tname LIKE '李%';
    +----------+
    | count(*) |
    +----------+
    |        2 |
    +----------+
    
    7、查询没有报李平老师课的学生姓名
       SELECT sid 学号,sname 姓名 from student WHERE sid NOT IN
            (SELECT student_id FROM score  RIGHT  JOIN 
                (SELECT cid FROM course LEFT JOIN teacher ON teacher.tid=course.teacher_id WHERE tname LIKE "李平%") AS A
                    ON score.course_id=A.cid GROUP BY student_id);
    +--------+--------+
    | 学号   | 姓名   |
    +--------+--------+
    |     13 | 刘三   |
    |     14 | 刘一   |
    |     15 | 刘二   |
    |     16 | 刘四   |
    +--------+--------+
     
    8、 查询物理课程比生物课程高的学生的学号
        SELECT * from (SELECT student_id ,cname,num  FROM score LEFT JOIN course ON score.course_id=course.cid WHERE cname="物理") AS A 
            INNER JOIN  (SELECT student_id,cname,num  FROM score LEFT JOIN course ON score.course_id=course.cid WHERE cname="生物")AS B 
                ON A.student_id=B.student_id WHERE A.num > B.num;
    +------------+--------+-----+------------+--------+-----+
    | student_id | cname  | num | student_id | cname  | num |
    +------------+--------+-----+------------+--------+-----+
    |          6 | 物理   | 100 |          6 | 生物   |   9 |
    |          7 | 物理   | 100 |          7 | 生物   |   9 |
    |          8 | 物理   | 100 |          8 | 生物   |   9 |
    +------------+--------+-----+------------+--------+-----+
     
    9、 查询没有同时选修物理课程和体育课程的学生姓名
        SELECT sid 学号,sname 学员 FROM student WHERE sid not in (SELECT student_id FROM score
            LEFT JOIN course on course.cid=score.course_id 
                WHERE cname="物理" OR cname="体育" GROUP BY student_id HAVING count(cname) >1);
    +--------+--------+
    | 学号   | 学员   |
    +--------+--------+
    |      1 | 理解   |
    |      2 | 钢蛋   |
    |     13 | 刘三   |
    |     14 | 刘一   |
    |     15 | 刘二   |
    |     16 | 刘四   |
    +--------+--------+
    
    10、查询挂科超过两门(包括两门)的学生姓名和班级
        SELECT sname,caption FROM (SELECT student_id,class_id,sname FROM score LEFT JOIN student ON student.sid=score.student_id  
            WHERE num < 60 GROUP BY score.student_id HAVING COUNT(*) > 1) AS A LEFT JOIN class ON class.cid=A.class_id;
    +--------+--------------+
    | sname  | caption      |
    +--------+--------------+
    | 理解   | 三年二班     |
    +--------+--------------+
    
    11、查询选修了所有课程的学生姓名
        SELECT student_id 学号,sname 姓名 FROM (SELECT * FROM score GROUP BY student_id HAVING COUNT(*) >= (SELECT COUNT(cname) FROM course )) AS A LEFT JOIN student
            ON A.student_id=student.sid;
    +--------+--------+
    | 学号   | 姓名   |
    +--------+--------+
    |      3 | 张三   |
    |      4 | 张一   |
    |      5 | 张二   |
    |      6 | 张四   |
    |      7 | 铁锤   |
    |      8 | 李三   |
    |      9 | 李一   |
    |     10 | 李二   |
    |     11 | 李四   |
    |     12 | 如花   |
    +--------+--------+
    
    12、查询李平老师教的课程的所有成绩记录
        SELECT tname 老师, cname 课程,num 分数 FROM (SELECT cid,tname,cname FROM teacher LEFT JOIN course ON teacher.tid=course.teacher_id WHERE tname LIKE "李平%") AS A
            LEFT  JOIN score ON score.course_id=A.cid;
    +--------------+--------+--------+
    | 老师         | 课程   | 分数   |
    +--------------+--------+--------+
    | 李平老师     | 物理   |      9 |
    | 李平老师     | 物理   |     66 |
    | 李平老师     | 物理   |     11 |
    | 李平老师     | 物理   |     11 |
    | 李平老师     | 物理   |    100 |
    | 李平老师     | 物理   |    100 |
    | 李平老师     | 物理   |    100 |
    | 李平老师     | 物理   |     88 |
    | 李平老师     | 物理   |     77 |
    | 李平老师     | 物理   |     77 |
    | 李平老师     | 物理   |     77 |
    | 李平老师     | 美术   |     66 |
    | 李平老师     | 美术   |     99 |
    | 李平老师     | 美术   |     99 |
    | 李平老师     | 美术   |    100 |
    | 李平老师     | 美术   |    100 |
    | 李平老师     | 美术   |    100 |
    | 李平老师     | 美术   |     88 |
    | 李平老师     | 美术   |     88 |
    | 李平老师     | 美术   |     22 |
    | 李平老师     | 美术   |     87 |
    | 李平老师     | 美术   |     87 |
    | 李平老师     | 美术   |     87 |
    +--------------+--------+--------+
      
    13、查询全部学生都选修了的课程号和课程名
        SELECT course_id FROM score
                    GROUP BY course_id
                    HAVING COUNT(course_id)=(SELECT COUNT(sid) FROM student);
    Empty set (0.00 sec)
     
    14、查询每门课程被选修的次数
        SELECT cname 课程名称,COUNT(course_id)次数 FROM score LEFT JOIN course on course.cid=score.course_id GROUP BY course_id;
    +--------------+--------+
    | 课程名称     | 次数   |
    +--------------+--------+
    | 生物         |     12 |
    | 物理         |     11 |
    | 体育         |     12 |
    | 美术         |     12 |
    +--------------+--------+
     
    15、查询只选修了一门课程的学生姓名和学号
        SELECT student.sid 学号 ,sname 姓名  FROM score LEFT JOIN student ON student.sid=score.student_id 
                GROUP BY student_id HAVING COUNT(course_id)=1;
    +--------+--------+
    | 学号   | 姓名   |
    +--------+--------+
    |     13 | 刘三   |
    +--------+--------+
     
    16、查询所有学生考出的成绩并按从高到低排序(成绩去重)
        SELECT DISTINCT num 成绩 from score ORDER BY num DESC;
    +--------+
    | 成绩   |
    +--------+
    |    100 |
    |     99 |
    |     91 |
    |     90 |
    |     88 |
    |     87 |
    |     79 |
    |     77 |
    |     68 |
    |     67 |
    |     66 |
    |     43 |
    |     22 |
    |     11 |
    |     10 |
    |      9 |
    |      8 |
    +--------+
     
    17、查询平均成绩大于85的学生姓名和平均成绩
        SELECT student.sname 姓名,avg(num) 平均成绩 FROM score LEFT JOIN student ON student.sid=score.student_id 
                GROUP BY student_id  HAVING avg(num) > 85;
    +--------+--------------+
    | 姓名   | 平均成绩     |
    +--------+--------------+
    | 刘三   |      87.0000 |
    +--------+--------------+
     
    18、查询生物成绩不及格的学生姓名和对应生物分数
        SELECT sname 姓名,cname 课程,num 分数 FROM (SELECT student_id,cname,num FROM score LEFT JOIN course on course.cid=score.course_id 
            WHERE cname="生物" and num<60) AS A
            LEFT JOIN 
            student ON A.student_id=student.sid;
    +--------+--------+--------+
    | 姓名   | 课程   | 分数   |
    +--------+--------+--------+
    | 理解   | 生物   |     10 |
    | 钢蛋   | 生物   |      8 |
    | 张四   | 生物   |      9 |
    | 铁锤   | 生物   |      9 |
    | 李三   | 生物   |      9 |
    +--------+--------+--------+
            
    19、查询在所有选修了李平老师课程的学生中,这些课程(李平老师的课程,不是所有课程)平均成绩最高的学生姓名
         SELECT sid 学号,sname 学生, tname 老师,平均成绩 from (SELECT student_id,tname,AVG(num) 平均成绩 FROM 
            (SELECT cid,tid,tname FROM course RIGHT JOIN teacher ON teacher.tid=course.teacher_id WHERE tname LIKE "李平%") AS A 
                LEFT  JOIN score ON A.cid=score.course_id GROUP BY student_id ORDER BY AVG(num) DESC LIMIT 1) AS B 
                LEFT JOIN student ON student.sid=B.student_id;
    +--------+--------+--------------+--------------+
    | 学号   | 学生   | 老师         | 平均成绩     |
    +--------+--------+--------------+--------------+
    |      6 | 张四   | 李平老师     |     100.0000 |
    +--------+--------+--------------+--------------+
    View Code
  • 相关阅读:
    ASP.NET 中GridView与CheckBox的使用 Followyour
    lucene 3.4 contrib/facet 切面搜索
    solr3.4 高亮(highlight),拼写检查(spellCheck),匹配相似(moreLikeThis) 应用实践
    在ubuntu上安装全文搜索中文分词Coreseek/sphinx及和Rails集成
    Linux下C语言字符串操作之字符串转数值型
    ESP32DEBUG调试设置
    IAP修改flash启动地址
    uart学习之环形缓冲区struct
    IAPBootLoader代码跳转
    基于FIFO实验仿真测试 输入数据是8位宽,FIFO位宽是16位,练习思路
  • 原文地址:https://www.cnblogs.com/lpbk/p/11370083.html
Copyright © 2011-2022 走看看