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+# 笔记
+
+## powerdesigner
+
+1：创建概念模型图（CDM）以用户角度
+
+2：转换逻辑模型图（LDM）以计算机角度
+
+3：转换物理模型图（PDM）以数据角度
+
+4：生成DDL
+
+数据库范式在实际中不会完全按照范式，根据需求实际操作
+
+## 作业：图书管理系统
+
+```java
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/11 23:10:39                           */
+/*==============================================================*/
+
+
+drop table if exists book_borrowing;
+
+drop table if exists book_retrieval;
+
+drop table if exists return_books;
+
+drop table if exists user;
+
+/*==============================================================*/
+/* Table: book_borrowing                                        */
+/*==============================================================*/
+create table book_borrowing
+(
+   bb_id                int not null auto_increment,
+   b_id                 int not null,
+   borrow_date          date not null,
+   expiry_date          date not null,
+   primary key (bb_id)
+);
+
+/*==============================================================*/
+/* Table: book_retrieval                                        */
+/*==============================================================*/
+create table book_retrieval
+(
+   b_id                 int not null auto_increment,
+   u_id                 int not null,
+   b_name               char(20) not null,
+   author               char(20) not null,
+   quantity             int not null,
+   floor                char(5) not null,
+   price                numeric(110,2),
+   shelf_number         int,
+   primary key (b_id)
+);
+
+/*==============================================================*/
+/* Table: return_books                                          */
+/*==============================================================*/
+create table return_books
+(
+   rb_id                int not null auto_increment,
+   u_id                 int not null,
+   b_id                 int not null,
+   return_book          date,
+   primary key (rb_id)
+);
+
+/*==============================================================*/
+/* Table: user                                                  */
+/*==============================================================*/
+create table user
+(
+   u_id                 int not null auto_increment,
+   u_name               char(10) not null,
+   u_password           char(10) not null,
+   primary key (u_id)
+);
+
+alter table book_borrowing add constraint FK_borrow foreign key (b_id)
+      references book_retrieval (b_id) on delete restrict on update restrict;
+
+alter table book_retrieval add constraint FK_check foreign key (u_id)
+      references user (u_id) on delete restrict on update restrict;
+
+alter table return_books add constraint FK_return foreign key (u_id)
+      references user (u_id) on delete restrict on update restrict;
+
+alter table return_books add constraint FK_return_books foreign key (b_id)
+      references book_retrieval (b_id) on delete restrict on update restrict;
+
+
+```