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@@ -0,0 +1,88 @@
+# 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
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/10 19:49:40                           */
+/*==============================================================*/
+
+
+drop table if exists Books;
+
+drop table if exists Borrowing;
+
+drop table if exists Borrowing2;
+
+drop table if exists publishinghouse;
+
+/*==============================================================*/
+/* Table: Books                                                 */
+/*==============================================================*/
+create table Books
+(
+   bo_id                varchar(20) not null,
+   pu_id                varchar(10) not null,
+   bo_name              varchar(10) not null,
+   bo_loc               varchar(20) not null,
+   primary key (bo_id)
+);
+
+/*==============================================================*/
+/* Table: Borrowing                                             */
+/*==============================================================*/
+create table Borrowing
+(
+   borr_id              varchar(2) not null,
+   borr_name            varchar(5) not null,
+   primary key (borr_id)
+);
+
+/*==============================================================*/
+/* Table: Borrowing2                                            */
+/*==============================================================*/
+create table Borrowing2
+(
+   bo_id                varchar(20) not null,
+   borr_id              varchar(2) not null,
+   borr_date            varchar(10) not null,
+   "Return"             varchar(10) not null,
+   primary key (bo_id, borr_id, borr_date)
+);
+
+/*==============================================================*/
+/* Table: publishinghouse                                       */
+/*==============================================================*/
+create table publishinghouse
+(
+   pu_id                varchar(10) not null,
+   pu_call              char(11) not null,
+   pu_zip               char(6) not null,
+   primary key (pu_id)
+);
+
+alter table Books add constraint FK_publication foreign key (pu_id)
+      references publishinghouse (pu_id) on delete restrict on update restrict;
+
+alter table Borrowing2 add constraint FK_Borrowing foreign key (bo_id)
+      references Books (bo_id) on delete restrict on update restrict;
+
+alter table Borrowing2 add constraint FK_Borrowing2 foreign key (borr_id)
+      references Borrowing (borr_id) on delete restrict on update restrict;
+
+
+```
+