From 4e0860c3292c90d68f048b4b961b084bd11d7322 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E6=96=87=E9=94=8B?= <2069827762@qq.com>
Date: Mon, 11 Sep 2023 22:35:00 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BD=9C=E4=B8=9A?=
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+# 笔记
+
+1、创建概念模型（类似ER图）CDM（用户角度）
+2、转换成逻辑模型LDM（计算机角度）
+3、转换成物理模型PDM（数据库角度）
+4、生成DDL
+
+```java
+
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/11 14:58:55                           */
+/*==============================================================*/
+CREATE database books charset utf8;
+use books;
+
+drop table if exists administrators;
+
+drop table if exists author;
+
+drop table if exists book;
+
+drop table if exists bowor;
+
+drop table if exists press;
+
+drop table if exists readers;
+
+drop table if exists stack;
+
+/*==============================================================*/
+/* Table: administrators                                        */
+/*==============================================================*/
+create table administrators
+(
+   ad_id                int not null,
+   ad_name              char(10) not null,
+   ad_sex               char(1) not null,
+   ad_duties            char(10) not null,
+   primary key (ad_id)
+);
+
+/*==============================================================*/
+/* Table: author                                                */
+/*==============================================================*/
+create table author
+(
+   auth_id              int not null,
+   auth_wprks           char(10) not null,
+   auth_price           int not null,
+   primary key (auth_id)
+);
+
+/*==============================================================*/
+/* Table: book                                                  */
+/*==============================================================*/
+create table book
+(
+   bo_id                int not null,
+   st_id                int not null,
+   auth_id              int not null,
+   pr_id                int not null,
+   bo_name              char(20) not null,
+   bo_price             int not null,
+   bo_author            char(10) not null,
+   primary key (bo_id)
+);
+
+/*==============================================================*/
+/* Table: bowor                                                 */
+/*==============================================================*/
+create table bowor
+(
+   re_id                int not null,
+   bo_id                int not null,
+   primary key (re_id, bo_id)
+);
+
+/*==============================================================*/
+/* Table: press                                                 */
+/*==============================================================*/
+create table press
+(
+   pr_id                int not null,
+   pr_name              char(10) not null,
+   pr_date              date not null,
+   primary key (pr_id)
+);
+
+/*==============================================================*/
+/* Table: readers                                               */
+/*==============================================================*/
+create table readers
+(
+   re_id                int not null,
+   re_name              char(20) not null,
+   re_age               int not null,
+   re_sex               char(1) not null,
+   primary key (re_id)
+);
+
+/*==============================================================*/
+/* Table: stack                                                 */
+/*==============================================================*/
+create table stack
+(
+   st_id                int not null,
+   ad_id                int not null,
+   st_address           char(20) not null,
+   st_area              int not null,
+   st_tel               int not null,
+   primary key (st_id)
+);
+
+alter table book add constraint FK_deposit foreign key (st_id)
+      references stack (st_id) on delete restrict on update restrict;
+
+alter table book add constraint FK_have foreign key (pr_id)
+      references press (pr_id) on delete restrict on update restrict;
+
+alter table book add constraint FK_work foreign key (auth_id)
+      references author (auth_id) on delete restrict on update restrict;
+
+alter table bowor add constraint FK_bowor foreign key (re_id)
+      references readers (re_id) on delete restrict on update restrict;
+
+alter table bowor add constraint FK_bowor2 foreign key (bo_id)
+      references book (bo_id) on delete restrict on update restrict;
+
+alter table stack add constraint FK_Relationship_5 foreign key (ad_id)
+      references administrators (ad_id) on delete restrict on update restrict;
+```
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-- 
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