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+## 笔记
+
+#### 使用**<font color = red>PowerDesigner</font>**
+
+- 第一步：创建概念模型  <mark>CDM</mark>（类似E-R图）-----‘以用户的角度’
+
+- 第二步：转换成逻辑模型  <mark>LDM</mark> -----‘以计算机的角度’
+
+- 第三步：转换成物理模型   <mark>PDM</mark> -----（以数据库的角度）
+
+- 第四步：生成<mark>DDL</mark>
+
+------
+
+## 单词注解
+
+```mysql
+1、entity 实体
+
+2、inheritance 继承；传承
+
+3、association 联合；联系
+
+4、association link 连接线
+
+5、general 综述；概要
+
+6、indentifiers 标识符
+
+7、cardinalities 基数
+
+8、attributes 属性
+
+9、mandatory 强制
+```
+
+
+
+## 作业
+
+```mysql
+CREATE DATABASE Library charset utf8;
+use Library;
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023-09-11 19:26:08                          */
+/*==============================================================*/
+
+
+drop table if exists book;
+
+drop table if exists borrow;
+
+drop table if exists people;
+
+drop table if exists publish;
+
+drop table if exists type;
+
+/*==============================================================*/
+/* Table: book                                                  */
+/*==============================================================*/
+create table book
+(
+   b_id                 int not null auto_increment,
+   pub_id               int not null,
+   ty_id                int not null,
+   b_name               varchar(20) not null,
+   b_number             varchar(10) not null,
+   b_address            varchar(10) not null,
+   primary key (b_id)
+);
+
+/*==============================================================*/
+/* Table: borrow                                                */
+/*==============================================================*/
+create table borrow
+(
+   p_id                 int not null,
+   b_id                 int not null,
+   primary key (p_id, b_id)
+);
+
+/*==============================================================*/
+/* Table: people                                                */
+/*==============================================================*/
+create table people
+(
+   p_id                 int not null auto_increment,
+   p_name               varchar(5) not null,
+   p_status             varchar(5) not null,
+   primary key (p_id)
+);
+
+/*==============================================================*/
+/* Table: publish                                               */
+/*==============================================================*/
+create table publish
+(
+   pub_id               int not null auto_increment,
+   pub_name             varchar(10) not null,
+   pub_tel              varchar(11) not null,
+   pub_address          varchar(20) not null,
+   pub_email            varchar(20) not null,
+   primary key (pub_id)
+);
+
+/*==============================================================*/
+/* Table: type                                                  */
+/*==============================================================*/
+create table type
+(
+   ty_id                int not null auto_increment,
+   ty_name              varchar(10) not null,
+   primary key (ty_id)
+);
+
+alter table book add constraint FK_come foreign key (pub_id)
+      references publish (pub_id) on delete restrict on update restrict;
+
+alter table book add constraint FK_sort foreign key (ty_id)
+      references type (ty_id) on delete restrict on update restrict;
+
+alter table borrow add constraint FK_borrow foreign key (p_id)
+      references people (p_id) on delete restrict on update restrict;
+
+alter table borrow add constraint FK_borrow2 foreign key (b_id)
+      references book (b_id) on delete restrict on update restrict;
+
+
+```
+