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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