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+**笔记**
+
+1.概念模型   CDM     ER图，人类角度
+
+2.逻辑模型   LDM     计算机
+
+3.物理模型   PDM      从具体数据库角度
+
+如何使用Typora自动上传图片
+
+**作业**
+
+```mysql
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/10 22:47:34                           */
+/*==============================================================*/
+CREATE DATABASE school_library charset utf8;
+use school_library;
+
+drop table if exists Administrator;
+
+drop table if exists book;
+
+drop table if exists fine;
+
+drop table if exists library;
+
+drop table if exists reader;
+
+drop table if exists registration;
+
+drop table if exists stack;
+
+/*==============================================================*/
+/* Table: Administrator                                         */
+/*==============================================================*/
+create table Administrator
+(
+   ad_id                int not null auto_increment,
+   lib_id               int,
+   ad_name              char(4) not null,
+   ad_sex               char(1) not null,
+   ad_tel               char(11) not null,
+   primary key (ad_id)
+);
+
+/*==============================================================*/
+/* Table: book                                                  */
+/*==============================================================*/
+create table book
+(
+   b_id                 char(10) not null,
+   sta_id               char(10),
+   b_name               char(10) not null,
+   b_author             char(10) not null,
+   b_press              char(10) not null,
+   b_count              char(10) not null,
+   primary key (b_id)
+);
+
+/*==============================================================*/
+/* Table: fine                                                  */
+/*==============================================================*/
+create table fine
+(
+   re_id                int,
+   b_id                 char(10),
+   finedate             char(11),
+   forfeit              decimal(3,1),
+   cause                char(30)
+);
+
+/*==============================================================*/
+/* Table: library                                               */
+/*==============================================================*/
+create table library
+(
+   lib_id               int not null auto_increment,
+   lib_name             char(8) not null,
+   lib_tel              char(11) not null,
+   lib_site             char(15) not null,
+   primary key (lib_id)
+);
+
+/*==============================================================*/
+/* Table: reader                                                */
+/*==============================================================*/
+create table reader
+(
+   re_id                int not null auto_increment,
+   re_name              char(4) not null,
+   re_xxt               char(20) not null,
+   re_age               char(3) not null,
+   re_college           char(8) not null,
+   re_major             char(8) not null,
+   re_grader            int not null,
+   re_class             char(4) not null,
+   primary key (re_id)
+);
+
+/*==============================================================*/
+/* Table: registration                                          */
+/*==============================================================*/
+create table registration
+(
+   re_id                int not null,
+   b_id                 char(10) not null,
+   ad_id                int,
+   sta_id               char(10),
+   Borrow               char(11),
+   pdsrd                char(11),
+   repayment            char(11),
+   renew                int,
+   primary key (re_id, b_id)
+);
+
+/*==============================================================*/
+/* Table: stack                                                 */
+/*==============================================================*/
+create table stack
+(
+   sta_id               char(10) not null,
+   lib_id               int,
+   sta_name             char(10) not null,
+   primary key (sta_id)
+);
+
+alter table Administrator add constraint FK_have foreign key (lib_id)
+      references library (lib_id) on delete restrict on update restrict;
+
+alter table book add constraint FK_Relationship_3 foreign key (sta_id)
+      references stack (sta_id) on delete restrict on update restrict;
+
+alter table fine add constraint FK_Relationship_8 foreign key (re_id, b_id)
+      references registration (re_id, b_id) on delete restrict on update restrict;
+
+alter table registration add constraint FK_Relationship_4 foreign key (re_id)
+      references reader (re_id) on delete restrict on update restrict;
+
+alter table registration add constraint FK_Relationship_5 foreign key (b_id)
+      references book (b_id) on delete restrict on update restrict;
+
+alter table registration add constraint FK_Relationship_7 foreign key (sta_id)
+      references stack (sta_id) on delete restrict on update restrict;
+
+alter table registration add constraint FK_look foreign key (ad_id)
+      references Administrator (ad_id) on delete restrict on update restrict;
+
+alter table stack add constraint FK_Relationship_2 foreign key (lib_id)
+      references library (lib_id) on delete restrict on update restrict;
+
+
+```
+
+
+