练习 - MySQL

Posted 2020-10-27 如果迎着风就飞，俯瞰这世界有多美

/*
Navicat mysql Data Transfer

Source Server         : localhost
Source Server Version : 50621
Source Host           : localhost:3306
Source Database       : cmz

Target Server Type    : MYSQL
Target Server Version : 50621
File Encoding         : 65001

Date: 2018-03-17 21:20:45
*/

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` char(10) NOT NULL,
  `grade_id` int(11) NOT NULL,
  PRIMARY KEY (`cid`),
  KEY `grade_id` (`grade_id`),
  CONSTRAINT `class_ibfk_1` FOREIGN KEY (`grade_id`) REFERENCES `class_grade` (`gid`)
) ENGINE=InnoDB AUTO_INCREMENT=12 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of class
-- ----------------------------
INSERT INTO `class` VALUES (\'1\', \'一年一班\', \'1\');
INSERT INTO `class` VALUES (\'2\', \'一年二班\', \'1\');
INSERT INTO `class` VALUES (\'3\', \'一年三班\', \'1\');
INSERT INTO `class` VALUES (\'4\', \'一年四班\', \'1\');
INSERT INTO `class` VALUES (\'5\', \'一年五班\', \'1\');
INSERT INTO `class` VALUES (\'6\', \'二年一班\', \'2\');
INSERT INTO `class` VALUES (\'7\', \'二年二班\', \'2\');
INSERT INTO `class` VALUES (\'8\', \'二年三班\', \'2\');
INSERT INTO `class` VALUES (\'9\', \'二年四班\', \'2\');
INSERT INTO `class` VALUES (\'10\', \'三年一班\', \'3\');
INSERT INTO `class` VALUES (\'11\', \'三年二班\', \'3\');

-- ----------------------------
-- Table structure for `class_grade`
-- ----------------------------
DROP TABLE IF EXISTS `class_grade`;
CREATE TABLE `class_grade` (
  `gid` int(11) NOT NULL AUTO_INCREMENT,
  `gname` char(10) NOT NULL,
  PRIMARY KEY (`gid`)
) ENGINE=InnoDB AUTO_INCREMENT=4 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of class_grade
-- ----------------------------
INSERT INTO `class_grade` VALUES (\'1\', \'一年级\');
INSERT INTO `class_grade` VALUES (\'2\', \'二年级\');
INSERT INTO `class_grade` VALUES (\'3\', \'三年级\');

-- ----------------------------
-- Table structure for `course`
-- ----------------------------
DROP TABLE IF EXISTS `course`;
CREATE TABLE `course` (
  `cid` int(11) NOT NULL AUTO_INCREMENT,
  `cname` char(10) NOT NULL,
  `teacher_id` int(11) NOT NULL,
  PRIMARY KEY (`cid`),
  KEY `teacher_id` (`teacher_id`),
  CONSTRAINT `course_ibfk_1` FOREIGN KEY (`teacher_id`) REFERENCES `teacher` (`tid`)
) ENGINE=InnoDB AUTO_INCREMENT=6 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of course
-- ----------------------------
INSERT INTO `course` VALUES (\'1\', \'生物\', \'1\');
INSERT INTO `course` VALUES (\'2\', \'体育\', \'1\');
INSERT INTO `course` VALUES (\'3\', \'物理\', \'2\');
INSERT INTO `course` VALUES (\'4\', \'数学\', \'1\');
INSERT INTO `course` VALUES (\'5\', \'美术\', \'3\');

-- ----------------------------
-- 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,
  `score` int(10) unsigned NOT NULL,
  PRIMARY KEY (`sid`),
  UNIQUE KEY `sid` (`sid`),
  KEY `student_id` (`student_id`),
  KEY `course_id` (`course_id`),
  CONSTRAINT `score_ibfk_1` FOREIGN KEY (`student_id`) REFERENCES `student` (`sid`),
  CONSTRAINT `score_ibfk_2` FOREIGN KEY (`course_id`) REFERENCES `course` (`cid`)
) ENGINE=InnoDB AUTO_INCREMENT=11 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of score
-- ----------------------------
INSERT INTO `score` VALUES (\'5\', \'1\', \'3\', \'80\');
INSERT INTO `score` VALUES (\'8\', \'4\', \'3\', \'70\');
INSERT INTO `score` VALUES (\'9\', \'5\', \'3\', \'50\');

-- ----------------------------
-- Table structure for `student`
-- ----------------------------
DROP TABLE IF EXISTS `student`;
CREATE TABLE `student` (
  `sid` int(11) NOT NULL AUTO_INCREMENT,
  `sname` char(10) NOT NULL,
  `gender` enum(\'男\',\'女\') DEFAULT NULL,
  `class_id` int(11) NOT NULL,
  PRIMARY KEY (`sid`),
  KEY `class_id` (`class_id`),
  CONSTRAINT `student_ibfk_1` FOREIGN KEY (`class_id`) REFERENCES `class` (`cid`)
) ENGINE=InnoDB AUTO_INCREMENT=18 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of student
-- ----------------------------
INSERT INTO `student` VALUES (\'1\', \'乔丹\', \'女\', \'1\');
INSERT INTO `student` VALUES (\'2\', \'艾森\', \'女\', \'2\');
INSERT INTO `student` VALUES (\'3\', \'科比\', \'男\', \'3\');
INSERT INTO `student` VALUES (\'4\', \'黄家\', \'女\', \'1\');
INSERT INTO `student` VALUES (\'5\', \'胡启\', \'男\', \'1\');
INSERT INTO `student` VALUES (\'6\', \'吴宇\', \'男\', \'2\');
INSERT INTO `student` VALUES (\'7\', \'唐明\', \'女\', \'3\');
INSERT INTO `student` VALUES (\'8\', \'叶葱\', \'男\', \'2\');
INSERT INTO `student` VALUES (\'9\', \'张淳\', \'女\', \'2\');
INSERT INTO `student` VALUES (\'10\', \'映月\', \'男\', \'1\');
INSERT INTO `student` VALUES (\'11\', \'胡启\', \'男\', \'1\');
INSERT INTO `student` VALUES (\'12\', \'天宇\', \'女\', \'2\');
INSERT INTO `student` VALUES (\'13\', \'孙兰\', \'男\', \'3\');
INSERT INTO `student` VALUES (\'14\', \'张笑\', \'男\', \'3\');
INSERT INTO `student` VALUES (\'15\', \'张兰\', \'女\', \'1\');
INSERT INTO `student` VALUES (\'16\', \'张兰\', \'女\', \'2\');
INSERT INTO `student` VALUES (\'17\', \'张兰\', \'女\', \'3\');

-- ----------------------------
-- Table structure for `teacher`
-- ----------------------------
DROP TABLE IF EXISTS `teacher`;
CREATE TABLE `teacher` (
  `tid` int(11) NOT NULL AUTO_INCREMENT,
  `tname` char(10) NOT NULL,
  PRIMARY KEY (`tid`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of teacher
-- ----------------------------
INSERT INTO `teacher` VALUES (\'1\', \'张三\');
INSERT INTO `teacher` VALUES (\'2\', \'李四\');
INSERT INTO `teacher` VALUES (\'3\', \'王五\');
INSERT INTO `teacher` VALUES (\'4\', \'李坤\');

-- ----------------------------
-- Table structure for `teacher2cls`
-- ----------------------------
DROP TABLE IF EXISTS `teacher2cls`;
CREATE TABLE `teacher2cls` (
  `tcid` int(11) NOT NULL AUTO_INCREMENT,
  `tid` int(11) NOT NULL,
  `cid` int(11) NOT NULL,
  PRIMARY KEY (`tcid`),
  UNIQUE KEY `tcid` (`tcid`),
  KEY `tid` (`tid`),
  KEY `cid` (`cid`),
  CONSTRAINT `teacher2cls_ibfk_1` FOREIGN KEY (`tid`) REFERENCES `teacher` (`tid`),
  CONSTRAINT `teacher2cls_ibfk_2` FOREIGN KEY (`cid`) REFERENCES `course` (`cid`)
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;

-- ----------------------------
-- Records of teacher2cls
-- ----------------------------
INSERT INTO `teacher2cls` VALUES (\'1\', \'1\', \'1\');
INSERT INTO `teacher2cls` VALUES (\'2\', \'1\', \'2\');
INSERT INTO `teacher2cls` VALUES (\'3\', \'2\', \'1\');
INSERT INTO `teacher2cls` VALUES (\'4\', \'3\', \'2\');

-- ----------------------------
-- Procedure structure for `p1`
-- ----------------------------
DROP PROCEDURE IF EXISTS `p1`;
DELIMITER ;;
CREATE DEFINER=`cmz`@`localhost` PROCEDURE `p1`()
BEGIN
    select * from score;
END
;;
DELIMITER ;

-- ----------------------------
-- Procedure structure for `p2`
-- ----------------------------
DROP PROCEDURE IF EXISTS `p2`;
DELIMITER ;;
CREATE DEFINER=`cmz`@`localhost` PROCEDURE `p2`(in n1 int,in n2 int,out res int)
BEGIN
    select * from score where course_id=n1 and score >n2 ;
    set res = 1;
END
;;
DELIMITER ;

完整sql

#1.------------------------- create database ------------------------- 
#1. create database and change this database
  create database cmz charset utf8;
  use cmz;

#2.------------------------- create table ------------------------- 
#2. create table 
  #1. teacher table
  create table teacher(
    tid int not null primary key auto_increment,
    tname char(10) not null
  )charset utf8 engine=innodb;
  
  #2. class_grade table
  create table class_grade(
    gid int not null primary key auto_increment,
    gname char(10) not null
  )charset utf8 engine=innodb;
  
  #3. course table
  create table course(
    cid int not null primary key auto_increment,
    cname char(10) not null,
    teacher_id int not null,
    foreign key(teacher_id) references teacher(tid)
  )charset utf8 engine=innodb;
  
  #4. class table
  create table class(
    cid int not null primary key auto_increment,
    caption char(10) not null,
    grade_id int not null,
    foreign key(grade_id) references class_grade(gid)
  )charset utf8 engine=innodb;
  
  #5. student table
  create table student(
    sid int not null primary key auto_increment,
    sname char(10) not null,
    gender enum(\'男\',\'女\'),
    class_id int not null,
    foreign key(class_id) references class(cid)
  )charset utf8 engine=innodb;
  
  #6. score table
  create table score(
    sid int not null unique auto_increment,
    student_id int not null,
    course_id int not null,
    score int unsigned not null,
    foreign key(student_id) references student(sid),
    foreign key(course_id) references course(cid),
    primary key(sid)
  )charset utf8 engine=innodb;
  
  #7. teacher2cls table
  create table teacher2cls(
    tcid int not null unique auto_increment,
    tid int not null,
    cid int not null,
    foreign key(tid) references teacher(tid),
    foreign key(cid) references course(cid),
    primary key(tcid)
  )charset utf8 engine=innodb;
 
#3. ------------------------- insert into table -------------------------  
# insert every table data
  #1. teacher table
  insert into teacher(tname) values
  ("张三"),
  ("李四"),
  ("王五");
  
  #2. class_grade table data
  insert into class_grade(gname) values
  ("一年级"),
  ("二年级"),
  ("三年级");
  
  #3. course table data
  insert into course(cname,teacher_id) values
  ("生物",1),
  ("体育",1),
  ("数学",1),
  ("物理",2);
  
  #4. class table data
  insert into class(caption,grade_id) values
  ("一年一班",1),
  ("一年二班",1),
  ("一年三班",1),
  ("一年四班",1),
  ("一年五班",1),
  ("二年一班",2),
  ("二年二班",2),
  ("二年三班",2),
  ("二年四班",2),
  ("三年一班",3),
  ("三年二班",3);
  
  #5. student table data
  insert into student(sname,gender,class_id) values
  ("乔丹","女",1),
  ("艾森","女",2),
  ("科比","男",3),
  ("黄家","女",1),
  ("胡启","男",1),
  ("吴宇","男",2),
  ("唐明","女",3),
  ("叶葱","男",2),
  ("张淳","女",2),
  ("映月","男",1),
  ("胡启","男",1),
  ("天宇","女",2),
  ("孙兰","男",3);
  
  #6. score table data
  insert into score(student_id,course_id,score) values
  (1,1,60),
  (1,2,59),
  (2,2,59);
  
  #7. teacher2cls table data
  insert into teacher2cls(tid,cid) values
  (1,1),
  (1,2),
  (2,1),
  (3,2);
  
 

 
# sql for operation mysql
#1. 创建测试数据 
#2. 查询学生总人数
select COUNT(sid) from student;
运行过程
mysql> select COUNT(sid) from student;
+------------+
| COUNT(sid) |
+------------+
|         17 |
+------------+
1 row in set (0.00 sec)
#3. 查询“生物”课程和“物理”课程都及格的学生id和姓名
select s1.sid,s1.sname from student s1 
   where s1.sid in (
    select distinct(s.student_id) from score s left join course c on c.cid=s.course_id 
      where s.score >= 60 and (c.cname=\'生物\' or c.cname=\'物理\'));
运行过程
mysql> select s1.sid,s1.sname from student s1
    ->    where s1.sid in (
    ->     select distinct(s.student_id) from score s left join course c on c.cid=s.course_id
    ->    where s.score >= 60 and (c.cname=\'生物\' or c.cname=\'物理\'));
+-----+-------+
| sid | sname |
+-----+-------+
|   1 | 乔丹  |
|   4 | 黄家  |
+-----+-------+
2 rows in set (0.00 sec)      
#4. 查询每个年级的班级数，取出班级数最多的前三个年级
select grade_id from class_grade LEFT JOIN class on class_grade.gid = class.grade_id 
  GROUP BY grade_id ORDER BY count(grade_id) asc LIMIT 3;
运行过程
mysql> select grade_id from class_grade LEFT JOIN class on class_grade.gid = class.grade_id
    ->   GROUP BY grade_id ORDER BY count(grade_id) asc LIMIT 3;
+----------+
| grade_id |
+----------+
|        3 |
|        2 |
|        1 |
+----------+
3 rows in set (0.00 sec)
#5. 查询 平均成绩最高和最低的学生的id和姓名以及平均成绩
SELECT student.sid,student.sname,avg(score) from student RIGHT JOIN score on student.sid = score.student_id 
  GROUP BY score  ORDER BY avg(score) desc LIMIT csharp Epicor标准练习片段

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