From 56a842b7a00bc9fef88643993acf449e4965e1c1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E8=94=A1=E5=98=89=E4=B9=90?= <3196825236@qq.com>
Date: Mon, 11 Sep 2023 11:47:34 +0000
Subject: [PATCH] =?UTF-8?q?13=20=E8=94=A1=E5=98=89=E4=B9=90?=
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Signed-off-by: 蔡嘉乐 <3196825236@qq.com>
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diff --git "a/13 \350\224\241\345\230\211\344\271\220/20230908\347\254\224\350\256\260\344\275\234\344\270\232.md" "b/13 \350\224\241\345\230\211\344\271\220/20230908\347\254\224\350\256\260\344\275\234\344\270\232.md"
new file mode 100644
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@@ -0,0 +1,101 @@
+### 数据库高级
+
+## 笔记
+
+## 操作步骤
+
+1.创建概念模型（E-R图） CDM
+
+2.转换成逻辑模型              LDM
+
+3.转换成物理模型              PDM
+
+4.生成DDL
+
+### 作业
+
+```mysql
+CREATE DATABASE test22 charset utf8;
+use test22;
+
+
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/11 10:13:52                           */
+/*==============================================================*/
+
+
+drop table if exists bookrent;
+
+drop table if exists bookreturn;
+
+drop table if exists bookse;
+
+drop table if exists uesr;
+
+/*==============================================================*/
+/* Table: bookrent                                              */
+/*==============================================================*/
+create table bookrent
+(
+   rent_id              numeric(10,0) not null,
+   book_id              int,
+   rent_date            date not null,
+   book_odate           date not null,
+   primary key (rent_id)
+);
+
+/*==============================================================*/
+/* Table: bookreturn                                            */
+/*==============================================================*/
+create table bookreturn
+(
+   re_id                numeric(10,0) not null,
+   book_id              int,
+   re_date              date not null,
+   primary key (re_id)
+);
+
+/*==============================================================*/
+/* Table: "bookse-+"                                            */
+/*==============================================================*/
+create table bookse
+(
+   book_id              int not null auto_increment,
+   user_id              numeric(10,0) not null,
+   book_name            char(5) not null,
+   book_bname           char(10) not null,
+   book_number          numeric(30,0) not null,
+   floor                numeric(10,0) not null,
+   price                int not null,
+   book_bid             char(65) not null,
+   primary key (book_id)
+);
+
+/*==============================================================*/
+/* Table: uesr                                                  */
+/*==============================================================*/
+create table uesr
+(
+   user_id              numeric(10,0) not null,
+   re_id                numeric(30,0),
+   user_name            char(10) not null,
+   password             numeric(10,0) not null,
+   primary key (user_id)
+);
+
+alter table bookrent add constraint FK_Relationship_2 foreign key (book_id)
+      references bookse (book_id) on delete restrict on update restrict;
+
+alter table bookreturn add constraint FK_Relationship_5 foreign key (book_id)
+      references bookse (book_id) on delete restrict on update restrict;
+
+alter table bookse add constraint FK_rent foreign key (user_id)
+      references uesr (user_id) on delete restrict on update restrict;
+
+alter table uesr add constraint FK_Relationship_4 foreign key (re_id)
+      references bookreturn (re_id) on delete restrict on update restrict;
+```
+
+
+
-- 
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