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@@ -0,0 +1,140 @@
+盘搜搜 vip解析 
+
+关注招聘信息
+
+#### 表与表之间的关系
+
+###### 1.一对一的关系
+
+​	将其中任一表中的主键，放到另一个表当主键
+
+###### 2.一对多的关系
+
+​	将一所在的表的主键放到多的表当外键
+
+###### 3.多对多的关系
+
+​	必须第三张表，将前面两个表的主键放进来当外键
+
+![image-20230906200509537](C:\Users\YGY31\AppData\Roaming\Typora\typora-user-images\image-20230906200509537.png)
+
+```mysql
+CREATE DATABASE Faculty CHARSET utf8;
+SHOW DATABASES;
+USE Faculty;
+CREATE TABLE college(
+	college_id int NOT NULL PRIMARY KEY,                         #学院编号
+	college_name VARCHAR(8) NOT NULL                             #学院名称
+	);
+INSERT INTO college VALUES
+(1,'软件工程学院'),
+(2,'城乡建筑学院'),
+(3,'智能制造学院');
+
+CREATE TABLE profession(
+	profession_id int NOT NULL PRIMARY KEY,                      #专业编号
+	profession_name VARCHAR(10) NOT NULL,                        #专业名称
+	college_id int NOT NULL,                                     #学院编号
+	foreign key (college_id) references college (college_id)
+	);
+INSERT INTO profession VALUES
+(01,'后端开发',1),
+(02,'新媒体运营',1),
+(03,'WEB前端',1);
+
+CREATE TABLE class(
+	class_id int NOT NULL PRIMARY KEY,                           #班级编号
+	class_name VARCHAR(10) NOT NULL,                             #班级名称
+	profession_id int NOT NULL,                                  #专业编号
+	FOREIGN KEY (profession_id) REFERENCES profession (profession_id)
+	);
+INSERT INTO class VALUES
+(001,'一班',01),
+(002,'二班',01),
+(003,'三班',01),
+(004,'四班',02),
+(005,'五班',02),
+(006,'六班',02),
+(007,'七班',03),
+(008,'八班',03),
+(009,'九班',03);
+
+CREATE TABLE student(
+	student_id int NOT NULL PRIMARY KEY,                         #学号
+	student_name VARCHAR(10) NOT NULL,                           #学生姓名
+	student_six  VARCHAR(1) NOT NULL,                            #学生性别
+	student_age  int NOT NULL,                            #学生年龄
+	student_address VARCHAR(9) NOT NULL,                         #学生籍贯
+	class_id int NOT NULL,                                       #班级编号
+	FOREIGN KEY (class_id) REFERENCES class (class_id)
+	);
+INSERT INTO student VALUES
+(224431347,'张三','男',19,'福建龙岩',001),
+(224431348,'李四','女',18,'福建漳州',001),
+(224431349,'王五','男',19,'福建莆田',001),
+(224431350,'赵六','男',20,'福建厦门',002),
+(224431351,'傻七','女',19,'福建福州',002);
+
+CREATE TABLE subject(
+	subject_id int NOT NULL PRIMARY KEY,                         #课程编号
+	subject_name VARCHAR(10)  NOT NULL                           #课程名称
+	);
+INSERT INTO subject VALUES
+(3424,'JAVA'),
+(4532,'HTML'),
+(6242,'Python'),
+(5734,'CSS');
+
+CREATE TABLE teacher(
+	teacher_id int NOT NULL PRIMARY KEY,                         #教师编号
+	teacher_name VARCHAR(10) NOT NULL,                           #教师姓名
+	subject_id int NOT NULL,                                     #课程编号
+	FOREIGN KEY (subject_id) REFERENCES subject (subject_id)
+	);
+INSERT INTO teacher VALUES
+(42321,'火星人',3424),
+(23421,'水星人',4532),
+(87643,'土星人',6242),
+(97633,'金星人',5734);
+
+CREATE TABLE classSchedule(   #课程表
+	subject_id int NOT NULL PRIMARY KEY,                         #课程编号
+	subject_name VARCHAR(10) NOT NULL,                           #课程名称
+	study_time VARCHAR(10) NOT NULL,                             #上课时间
+	study_address VARCHAR(8) NOT NULL,                           #上课地址
+	teacher_id int NOT NULL                                      #授课教师编号
+	);
+INSERT INTO classSchedule VALUES
+(3424,'JAVA','8:30','实训8',42321),
+(4532,'HTML','10:00','实训8',23421),
+(6242,'Python','14:00','实训8',87643),
+(5734,'CSS','16:00','实训8',97633);
+
+CREATE TABLE CourseSelect(    #选课表
+	subject_id int NOT NULL PRIMARY KEY,                         #课程编号
+	subject_name VARCHAR(10) NOT NULL,                           #课程名称
+	teacher_id int NOT NULL                                      #授课教师编号
+	);
+INSERT INTO CourseSelect VALUES
+(3424,'JAVA',42321),
+(4532,'HTML',23421),
+(6242,'Python',87643),
+(5734,'CSS',97633);
+
+CREATE TABLE gradeTable(      #成绩表
+	student_id int NOT NULL PRIMARY KEY,                         #学生编号
+	student_name VARCHAR(10) NOT NULL,                           #学生姓名
+	Java DOUBLE NOT NULL,                                        #Java成绩
+	HTML DOUBLE NOT NULL,                                        #HTML成绩
+	Python DOUBLE NOT NULL,                                      #Python成绩
+	CSS    DOUBLE NOT NULL,                                      #CSS成绩
+	FOREIGN KEY (student_id) REFERENCES student (student_id)
+	);
+INSERT INTO gradeTable VALUES
+(224431347,'张三',99,96,98,100),
+(224431348,'李四',96,97,89,95),
+(224431349,'王五',87,94,93,95),
+(224431350,'赵六',98,92,86,90),
+(224431351,'傻七',33,66,88,59);
+```
+
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