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+# day0908
+
+今天学习了一个新的软件：PowerDesigner
+
+这个软件可以用来生成数据库模型 数据库语句，创建表的结构，大大提升了我们创建数据库的速度
+
+对我们的学习有着很大的帮助
+
+## 作业：
+
+~~~mysql
+
+
+# 作业
+
+```MySQL
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/10 23:08:03                           */
+/*==============================================================*/
+
+
+create database tsg charset utf8;
+use tsg;
+
+drop table if exists apply;
+
+drop table if exists books;
+
+drop table if exists bulletin;
+
+drop table if exists jy;
+
+drop table if exists library;
+
+drop table if exists manage;
+
+drop table if exists pl;
+
+drop table if exists sc;
+
+drop table if exists student;
+
+/*==============================================================*/
+/* Table: apply                                                 */
+/*==============================================================*/
+create table apply
+(
+   app_id               int not null auto_increment,
+   stu_id               int not null,
+   man_id               int,
+   add_time             time not null,
+   add_status           char(5) not null,
+   add_cause            varchar(11) not null,
+   add_persontime       time not null,
+   primary key (app_id)
+);
+
+/*==============================================================*/
+/* Table: books                                                 */
+/*==============================================================*/
+create table books
+(
+   bo_id                int not null auto_increment,
+   man_id               int not null,
+   bo_name              varchar(11) not null,
+   bo_type              varchar(10) not null,
+   bo_author            char(10) not null,
+   bo_brief             varchar(11) not null,
+   bo_press             varchar(10) not null,
+   bo_status            char(5) not null,
+   primary key (bo_id)
+);
+
+insert into books values (1,1,"水浒传","奇幻","施耐庵","简介","某某出版社","出借");
+
+/*==============================================================*/
+/* Table: bulletin                                              */
+/*==============================================================*/
+create table bulletin
+(
+   bu_id                int not null auto_increment,
+   man_id               int not null,
+   bu_title             char(10) not null,
+   bu_content           varchar(11) not null,
+   bu_time              time not null,
+   bu_delete            char(10) not null,
+   primary key (bu_id)
+);
+insert into bulletin values(1,1,"公告","内容","23:00:00","否");
+
+/*==============================================================*/
+/* Table: jy                                                    */
+/*==============================================================*/
+create table jy
+(
+   bo_id                int not null,
+   stu_id               int not null,
+   jy_id                int,
+   man_id               int,
+   jy_time              time,
+   jy_zt                char(2),
+   jy_sh                time,
+   jy_yy                varchar(11),
+   jy_gh                time,
+   primary key (bo_id, stu_id)
+);
+insert into jy values(1,1,1,1,"15:00:00","出借","16:00:00","未拒绝","");
+
+/*==============================================================*/
+/* Table: library                                               */
+/*==============================================================*/
+create table library
+(
+   li_id                int not null auto_increment,
+   app_id               int not null,
+   primary key (li_id)
+);
+insert into library values(1,1);
+
+/*==============================================================*/
+/* Table: manage                                                */
+/*==============================================================*/
+create table manage
+(
+   man_id               int not null auto_increment,
+   primary key (man_id)
+);
+insert into manage values(1);
+
+/*==============================================================*/
+/* Table: pl                                                    */
+/*==============================================================*/
+create table pl
+(
+   bo_id                int not null,
+   stu_id               int not null,
+   pl_id                int,
+   pl_pf                int,
+   pl_nr                varchar(11),
+   pl_time              time,
+   primary key (bo_id, stu_id)
+);
+insert into pl values(1,1,1,100,"非常经典","15:00:00");
+
+
+/*==============================================================*/
+/* Table: sc                                                    */
+/*==============================================================*/
+create table sc
+(
+   bo_id                int not null,
+   stu_id               int not null,
+   sc_id                int,
+   sc_time              time,
+   sc_qx                char(2),
+   sc_qxtime            time,
+   primary key (bo_id, stu_id)
+);
+insert into sc values(1,1,1,"10:00:00","否","");
+
+/*==============================================================*/
+/* Table: student                                               */
+/*==============================================================*/
+create table student
+(
+   stu_id               int not null auto_increment,
+   stu_name             char(8) not null,
+   stu_belong           char(8) not null,
+   stu_sex              char(3) not null,
+   primary key (stu_id)
+);
+insert into student values(1,"王路","二班","女");
+
+
+
+
+```
+~~~
+