SQL 嵌套查询的具体使用（sql 嵌套查询的具体使用什么函数）难以置信

文章摘要

这篇文章主要介绍了在MySQL数据库中创建表并进行数据插入的操作。文章详细描述了如何在MySQL中定义多个表的结构，包括`class`、`course`、`score`、`student`、`teacher`等表的字段、数据类型、主键、外键约束等。此外，文章还展示了如何在MySQL中对这些表进行数据插入操作，插入了包括学生成绩、课程信息、学生基本信息等数据。文章整体内容围绕数据库表的设计与数据操作展开，展示了如何在MySQL中建立完整的数据库结构及其数据关系。

#创建表及插入记录
CREATE TABLE class (
cid int(11) NOT NULL AUTO_INCREMENT,
caption varchar(32) NOT NULL,
PRIMARY KEY (cid)
) ENGINE=InnoDB CHARSET=utf8;

INSERT INTO class VALUES
(1, ‘三年二班’),
(2, ‘三年三班’),
(3, ‘一年二班’),
(4, ‘二年九班’);

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 DEFAULT CHARSET=utf8;

INSERT INTO course VALUES
(1, ‘生物’, 1),
(2, ‘物理’, 2),
(3, ‘体育’, 3),
(4, ‘美术’, 2);

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 DEFAULT CHARSET=utf8;

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

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 DEFAULT CHARSET=utf8;

INSERT INTO student VALUES
(1, ‘男’, 1, ‘理解’),
(2, ‘女’, 1, ‘钢蛋’),
(3, ‘男’, 1, ‘张三’),
(4, ‘男’, 1, ‘张一’),
(5, ‘女’, 1, ‘张二’),
(6, ‘男’, 1, ‘张四’),
(7, ‘女’, 2, ‘铁锤’),
(8, ‘男’, 2, ‘李三’),
(9, ‘男’, 2, ‘李一’),
(10, ‘女’, 2, ‘李二’),
(11, ‘男’, 2, ‘李四’),
(12, ‘女’, 3, ‘如花’),
(13, ‘男’, 3, ‘刘三’),
(14, ‘男’, 3, ‘刘一’),
(15, ‘女’, 3, ‘刘二’),
(16, ‘男’, 3, ‘刘四’)

CREATE TABLE teacher(
tid int(11) NOT NULL AUTO_INCREMENT,
tname varchar(32) NOT NULL,
PRIMARY KEY (tid)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

INSERT INTO teacher VALUES
(1, ‘张磊老师’),
(2, ‘李平老师’),
(3, ‘刘海燕老师’),
(4, ‘朱云海老师’),
(5, ‘李杰老师’);