mysql练习题

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一、表关系

请创建如下表,并创建相关约束

 

二、操作表

1、自行创建测试数据

/*
Navicat mysql Data Transfer

Source Server         : mysql5.7.1
Source Server Version : 50717
Source Host           : localhost:3306
Source Database       : crm

Target Server Type    : MYSQL
Target Server Version : 50717
File Encoding         : 65001

Date: 2017-02-24 09:50:15
*/

SET FOREIGN_KEY_CHECKS=0;

-- ----------------------------
-- Table structure for class
-- ----------------------------
DROP TABLE IF EXISTS `class`;
CREATE TABLE `class` (
  `cid` int(11) NOT NULL AUTO_INCREMENT,
  `caption` varchar(32) NOT NULL,
  PRIMARY KEY (`cid`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of class
-- ----------------------------
INSERT INTO `class` VALUES (\'1\', \'三年二班\');
INSERT INTO `class` VALUES (\'2\', \'三年三班\');
INSERT INTO `class` VALUES (\'3\', \'一年二班\');
INSERT INTO `class` VALUES (\'4\', \'二年九班\');

-- ----------------------------
-- Table structure for course
-- ----------------------------
DROP TABLE IF EXISTS `course`;
CREATE TABLE `course` (
  `cid` int(11) NOT NULL AUTO_INCREMENT,
  `cname` varchar(32) NOT NULL,
  `teacher_id` int(11) NOT NULL,
  PRIMARY KEY (`cid`),
  KEY `fk_course_teacher` (`teacher_id`),
  CONSTRAINT `fk_course_teacher` FOREIGN KEY (`teacher_id`) REFERENCES `teacher` (`tid`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of course
-- ----------------------------
INSERT INTO `course` VALUES (\'1\', \'生物\', \'1\');
INSERT INTO `course` VALUES (\'2\', \'物理\', \'2\');
INSERT INTO `course` VALUES (\'3\', \'体育\', \'3\');
INSERT INTO `course` VALUES (\'4\', \'美术\', \'2\');

-- ----------------------------
-- Table structure for score
-- ----------------------------
DROP TABLE IF EXISTS `score`;
CREATE TABLE `score` (
  `sid` int(11) NOT NULL AUTO_INCREMENT,
  `student_id` int(11) NOT NULL,
  `course_id` int(11) NOT NULL,
  `num` int(11) NOT NULL,
  PRIMARY KEY (`sid`),
  KEY `fk_score_student` (`student_id`),
  KEY `fk_score_course` (`course_id`),
  CONSTRAINT `fk_score_course` FOREIGN KEY (`course_id`) REFERENCES `course` (`cid`),
  CONSTRAINT `fk_score_student` FOREIGN KEY (`student_id`) REFERENCES `student` (`sid`)
) ENGINE=InnoDB AUTO_INCREMENT=53 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of score
-- ----------------------------
INSERT INTO `score` VALUES (\'1\', \'1\', \'1\', \'10\');
INSERT INTO `score` VALUES (\'2\', \'1\', \'2\', \'9\');
INSERT INTO `score` VALUES (\'5\', \'1\', \'4\', \'66\');
INSERT INTO `score` VALUES (\'6\', \'2\', \'1\', \'8\');
INSERT INTO `score` VALUES (\'8\', \'2\', \'3\', \'68\');
INSERT INTO `score` VALUES (\'9\', \'2\', \'4\', \'99\');
INSERT INTO `score` VALUES (\'10\', \'3\', \'1\', \'77\');
INSERT INTO `score` VALUES (\'11\', \'3\', \'2\', \'66\');
INSERT INTO `score` VALUES (\'12\', \'3\', \'3\', \'87\');
INSERT INTO `score` VALUES (\'13\', \'3\', \'4\', \'99\');
INSERT INTO `score` VALUES (\'14\', \'4\', \'1\', \'79\');
INSERT INTO `score` VALUES (\'15\', \'4\', \'2\', \'11\');
INSERT INTO `score` VALUES (\'16\', \'4\', \'3\', \'67\');
INSERT INTO `score` VALUES (\'17\', \'4\', \'4\', \'100\');
INSERT INTO `score` VALUES (\'18\', \'5\', \'1\', \'79\');
INSERT INTO `score` VALUES (\'19\', \'5\', \'2\', \'11\');
INSERT INTO `score` VALUES (\'20\', \'5\', \'3\', \'67\');
INSERT INTO `score` VALUES (\'21\', \'5\', \'4\', \'100\');
INSERT INTO `score` VALUES (\'22\', \'6\', \'1\', \'9\');
INSERT INTO `score` VALUES (\'23\', \'6\', \'2\', \'100\');
INSERT INTO `score` VALUES (\'24\', \'6\', \'3\', \'67\');
INSERT INTO `score` VALUES (\'25\', \'6\', \'4\', \'100\');
INSERT INTO `score` VALUES (\'26\', \'7\', \'1\', \'9\');
INSERT INTO `score` VALUES (\'27\', \'7\', \'2\', \'100\');
INSERT INTO `score` VALUES (\'28\', \'7\', \'3\', \'67\');
INSERT INTO `score` VALUES (\'29\', \'7\', \'4\', \'88\');
INSERT INTO `score` VALUES (\'30\', \'8\', \'1\', \'9\');
INSERT INTO `score` VALUES (\'31\', \'8\', \'2\', \'100\');
INSERT INTO `score` VALUES (\'32\', \'8\', \'3\', \'67\');
INSERT INTO `score` VALUES (\'33\', \'8\', \'4\', \'88\');
INSERT INTO `score` VALUES (\'34\', \'9\', \'1\', \'91\');
INSERT INTO `score` VALUES (\'35\', \'9\', \'2\', \'88\');
INSERT INTO `score` VALUES (\'36\', \'9\', \'3\', \'67\');
INSERT INTO `score` VALUES (\'37\', \'9\', \'4\', \'22\');
INSERT INTO `score` VALUES (\'38\', \'10\', \'1\', \'90\');
INSERT INTO `score` VALUES (\'39\', \'10\', \'2\', \'77\');
INSERT INTO `score` VALUES (\'40\', \'10\', \'3\', \'43\');
INSERT INTO `score` VALUES (\'41\', \'10\', \'4\', \'87\');
INSERT INTO `score` VALUES (\'42\', \'11\', \'1\', \'90\');
INSERT INTO `score` VALUES (\'43\', \'11\', \'2\', \'77\');
INSERT INTO `score` VALUES (\'44\', \'11\', \'3\', \'43\');
INSERT INTO `score` VALUES (\'45\', \'11\', \'4\', \'87\');
INSERT INTO `score` VALUES (\'46\', \'12\', \'1\', \'90\');
INSERT INTO `score` VALUES (\'47\', \'12\', \'2\', \'77\');
INSERT INTO `score` VALUES (\'48\', \'12\', \'3\', \'43\');
INSERT INTO `score` VALUES (\'49\', \'12\', \'4\', \'87\');
INSERT INTO `score` VALUES (\'52\', \'13\', \'3\', \'87\');

-- ----------------------------
-- Table structure for student
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
  `sid` int(11) NOT NULL AUTO_INCREMENT,
  `gender` char(1) NOT NULL,
  `class_id` int(11) NOT NULL,
  `sname` varchar(32) NOT NULL,
  PRIMARY KEY (`sid`),
  KEY `fk_class` (`class_id`),
  CONSTRAINT `fk_class` FOREIGN KEY (`class_id`) REFERENCES `class` (`cid`)
) ENGINE=InnoDB AUTO_INCREMENT=17 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES (\'1\', \'男\', \'1\', \'刘洋\');
INSERT INTO `student` VALUES (\'2\', \'女\', \'1\', \'钢蛋\');
INSERT INTO `student` VALUES (\'3\', \'男\', \'1\', \'刘泽栋\');
INSERT INTO `student` VALUES (\'4\', \'男\', \'1\', \'张少博\');
INSERT INTO `student` VALUES (\'5\', \'女\', \'1\', \'张少强\');
INSERT INTO `student` VALUES (\'6\', \'男\', \'1\', \'王飞\');
INSERT INTO `student` VALUES (\'7\', \'女\', \'2\', \'铁锤\');
INSERT INTO `student` VALUES (\'8\', \'男\', \'2\', \'李三\');
INSERT INTO `student` VALUES (\'9\', \'男\', \'2\', \'李一\');
INSERT INTO `student` VALUES (\'10\', \'女\', \'2\', \'李二\');
INSERT INTO `student` VALUES (\'11\', \'男\', \'2\', \'李四\');
INSERT INTO `student` VALUES (\'12\', \'女\', \'3\', \'王鹏\');
INSERT INTO `student` VALUES (\'13\', \'男\', \'3\', \'刘明\');
INSERT INTO `student` VALUES (\'14\', \'男\', \'3\', \'刘刚\');
INSERT INTO `student` VALUES (\'15\', \'女\', \'3\', \'刘二\');
INSERT INTO `student` VALUES (\'16\', \'男\', \'3\', \'刘四\');

-- ----------------------------
-- Table structure for teacher
-- ----------------------------
DROP TABLE IF EXISTS `teacher`;
CREATE TABLE `teacher` (
  `tid` int(11) NOT NULL AUTO_INCREMENT,
  `tname` varchar(32) NOT NULL,
  PRIMARY KEY (`tid`)
) ENGINE=InnoDB AUTO_INCREMENT=7 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of teacher
-- ----------------------------
INSERT INTO `teacher` VALUES (\'1\', \'马云老师\');
INSERT INTO `teacher` VALUES (\'2\', \'刘强东老师\');
INSERT INTO `teacher` VALUES (\'3\', \'马化腾老师\');
INSERT INTO `teacher` VALUES (\'4\', \'丁磊老师\');
INSERT INTO `teacher` VALUES (\'5\', \'王建宁老师\');
INSERT INTO `teacher` VALUES (\'6\', \'李杰老师\');

  

2、查询“生物”课程比“物理”课程成绩高的所有学生的学号;

 

3、查询平均成绩大于60分的同学的学号和平均成绩; 

mysql> select student_id,avg(num) from score group by student_id having avg(num) > 60;

+------------+----------+
| student_id | avg(num) |
+------------+----------+
| 3 | 82.2500 |
| 4 | 64.2500 |
| 5 | 64.2500 |
| 6 | 69.0000 |
| 7 | 66.0000 |
| 8 | 66.0000 |
| 9 | 67.0000 |
| 10 | 74.2500 |
| 11 | 74.2500 |
| 12 | 74.2500 |
| 13 | 87.0000 |
+------------+----------+
11 rows in set

4、查询所有同学的学号、姓名、选课数、总成绩;

 

 

5、查询姓“李”的老师的个数;

mysql> select * from teacher;
+-----+------------+
| tid | tname      |
+-----+------------+
|   1 | 马云老师   |
|   2 | 刘强东老师 |
|   3 | 马化腾老师 |
|   4 | 丁磊老师   |
|   5 | 王建宁老师 |
|   6 | 李杰老师   |
+-----+------------+
6 rows in set

mysql> select count(tid) from teacher where tname like \'李%\' ;

+------------+
| count(tid) |
+------------+
|          1 |
+------------+
1 row in set

6、查询没学过“马云”老师课的同学的学号、姓名;

 

 

7、查询学过“001”并且也学过编号“002”课程的同学的学号、姓名;

 

8、查询学过“马云”老师所教的所有课的同学的学号、姓名;

 

9、查询课程编号“002”的成绩比课程编号“001”课程低的所有同学的学号、姓名;

 

10、查询有课程成绩小于60分的同学的学号、姓名;

 

11、查询没有学全所有课的同学的学号、姓名;

 

12、查询至少有一门课与学号为“001”的同学所学相同的同学的学号和姓名;

 

13、查询至少学过学号为“001”同学所有一门课的其他同学学号和姓名;

 

14、查询和“002”号的同学学习的课程完全相同的其他同学学号和姓名;

 

15、删除学习“马云”老师课的SC表记录;

 

16、向SC表中插入一些记录,这些记录要求符合以下条件:①没有上过编号“002”课程的同学学号;②插入“002”号课程的平均成绩; 

 

17、按平均成绩从低到高显示所有学生的“语文”、“数学”、“英语”三门的课程成绩,按如下形式显示: 学生ID,语文,数学,英语,有效课程数,有效平均分;

 

18、查询各科成绩最高和最低的分:以如下形式显示:课程ID,最高分,最低分;

 

19、按各科平均成绩从低到高和及格率的百分数从高到低顺序;

 

20、课程平均分从高到低显示(现实任课老师);

 

21、查询各科成绩前三名的记录:(不考虑成绩并列情况) 

 

22、查询每门课程被选修的学生数;

 

23、查询出只选修了一门课程的全部学生的学号和姓名;

 

24、查询男生、女生的人数;

 

25、查询姓“张”的学生名单;

 

26、查询同名同姓学生名单,并统计同名人数;

 

27、查询每门课程的平均成绩,结果按平均成绩升序排列,平均成绩相同时,按课程号降序排列;

 

28、查询平均成绩大于85的所有学生的学号、姓名和平均成绩;

 

29、查询课程名称为“数学”,且分数低于60的学生姓名和分数;

 

30、查询课程编号为003且课程成绩在80分以上的学生的学号和姓名; 

 

31、求选了课程的学生人数

 

32、查询选修“杨艳”老师所授课程的学生中,成绩最高的学生姓名及其成绩;

 

33、查询各个课程及相应的选修人数;

 

34、查询不同课程但成绩相同的学生的学号、课程号、学生成绩;

 

35、查询每门课程成绩最好的前两名;

 

36、检索至少选修两门课程的学生学号;

 

37、查询全部学生都选修的课程的课程号和课程名;

 

38、查询没学过“叶平”老师讲授的任一门课程的学生姓名;

 

39、查询两门以上不及格课程的同学的学号及其平均成绩;

 

40、检索“004”课程分数小于60,按分数降序排列的同学学号;

 

41、删除“002”同学的“001”课程的成绩;

 

 

 

 

 

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