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diff --git "a/\345\256\213\345\207\257/homework.sql" "b/\345\256\213\345\207\257/homework.sql"
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@@ -0,0 +1,83 @@
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2024/9/6 22:36:02                            */
+/*==============================================================*/
+
+
+drop table if exists Address;
+
+drop table if exists Department;
+
+drop table if exists Employee;
+
+drop table if exists Project;
+
+drop table if exists "join";
+
+/*==============================================================*/
+/* Table: Address                                               */
+/*==============================================================*/
+create table Address
+(
+   Country              char(10),
+   City                 char(10),
+   Street               char(10),
+   AddressID            char(10) not null,
+   primary key (AddressID)
+);
+
+/*==============================================================*/
+/* Table: Department                                            */
+/*==============================================================*/
+create table Department
+(
+   DepartmentID         char(10) not null,
+   EmployeeId           char(10) not null,
+   DepartmentName       char(10),
+   primary key (DepartmentID)
+);
+
+/*==============================================================*/
+/* Table: Employee                                              */
+/*==============================================================*/
+create table Employee
+(
+   EmployeeId           char(10) not null,
+   AddressID            char(10) not null,
+   Name                 char(10),
+   Position             char(10),
+   primary key (EmployeeId)
+);
+
+/*==============================================================*/
+/* Table: Project                                               */
+/*==============================================================*/
+create table Project
+(
+   ProjectID            char(10) not null,
+   ProjectName          char(10),
+   primary key (ProjectID)
+);
+
+/*==============================================================*/
+/* Table: "join"                                                */
+/*==============================================================*/
+create table "join"
+(
+   ProjectID            char(10) not null,
+   EmployeeId           char(10) not null,
+   primary key (ProjectID, EmployeeId)
+);
+
+alter table Department add constraint FK_belong foreign key (EmployeeId)
+      references Employee (EmployeeId) on delete restrict on update restrict;
+
+alter table Employee add constraint FK_live foreign key (AddressID)
+      references Address (AddressID) on delete restrict on update restrict;
+
+alter table "join" add constraint FK_join foreign key (ProjectID)
+      references Project (ProjectID) on delete restrict on update restrict;
+
+alter table "join" add constraint FK_join2 foreign key (EmployeeId)
+      references Employee (EmployeeId) on delete restrict on update restrict;
+
diff --git "a/\345\256\213\345\207\257/\346\225\260\346\215\256\345\272\223\351\253\230\347\272\247 \347\254\254\344\270\200\350\257\276.md" "b/\345\256\213\345\207\257/\346\225\260\346\215\256\345\272\223\351\253\230\347\272\247 \347\254\254\344\270\200\350\257\276.md"
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index 0000000000000000000000000000000000000000..be2b2642c77e180130f4c430499dbd6c730315f0
--- /dev/null
+++ "b/\345\256\213\345\207\257/\346\225\260\346\215\256\345\272\223\351\253\230\347\272\247 \347\254\254\344\270\200\350\257\276.md"	
@@ -0,0 +1,15 @@
+#                     **数据库高级 第一课**
+
+
+
+A 表中的每一条数据, 在B 表中只有一条与其对应，反之亦然。
+关系型数据库mysql, PostgreSQL .
+表与表的关系1 .一对一①学生表, 学号姓名②公安表:身份证号
+2 , 一对多A 表中的每一条数据, 在B 表中能找到多条与其对应
+3, 多对多A 多, B 多
+如何让表与表之间产生关系.
+1 , |对|:任意一个表的主键, 放在另一个表当外键.
+2 .1 对多:将1 所在的表的主键, 放到多的表的当外键
+3 , 多对多;要建立第三张表, 将前面两个表的主键, 放在该表当外键.
+E R 图
+1 , 实体关系图:用图来表示实体之间关系、
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