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 <11785114+yejunyi@user.noreply.gitee.com>
Date: Sun, 10 Sep 2023 14:56:00 +0000
Subject: [PATCH] =?UTF-8?q?=E5=8F=B6=E4=BF=8A=E8=BD=B6=E7=9A=84=E4=BD=9C?=
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Signed-off-by: 叶俊轶 <11785114+yejunyi@user.noreply.gitee.com>
---
 .../20230908 \346\227\245\345\277\227.md"     | 114 ++++++++++++++++++
 1 file changed, 114 insertions(+)
 create mode 100644 "12 \345\217\266\344\277\212\350\275\266/20230908 \346\227\245\345\277\227.md"

diff --git "a/12 \345\217\266\344\277\212\350\275\266/20230908 \346\227\245\345\277\227.md" "b/12 \345\217\266\344\277\212\350\275\266/20230908 \346\227\245\345\277\227.md"
new file mode 100644
index 0000000..f44f931
--- /dev/null
+++ "b/12 \345\217\266\344\277\212\350\275\266/20230908 \346\227\245\345\277\227.md"	
@@ -0,0 +1,114 @@
+2023年09月08日
+
+周五
+
+天气：咪咪雨
+
+心情：OK
+
+明天是周末，什么powerdesigner，什么CDM，逻辑视图，物理视图，前面忘了，中间忘了，后面忘了，作业是图书馆数据库，还有个picgo，心情好不写了。
+
+```sql
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/10 22:21:34                           */
+/*==============================================================*/
+
+
+drop table if exists Borrowing;
+
+drop table if exists UserId;
+
+drop table if exists book;
+
+drop table if exists dengji;
+
+drop table if exists jiyie;
+
+drop table if exists "return";
+
+/*==============================================================*/
+/* Table: Borrowing                                             */
+/*==============================================================*/
+create table Borrowing
+(
+   brtime               char(10) not null,
+   userid               int(10) not null auto_increment,
+   username             char(6) not null,
+   returntime           date not null,
+   bokname              char(5) not null,
+   bokid                int(10) not null auto_increment,
+   primary key (userid, bokid)
+);
+
+/*==============================================================*/
+/* Table: UserId                                                */
+/*==============================================================*/
+create table UserId
+(
+   user_id              int(10) not null auto_increment,
+   user_name            char(5) not null,
+   user_password        char(6) not null,
+   primary key (user_id)
+);
+
+/*==============================================================*/
+/* Table: book                                                  */
+/*==============================================================*/
+create table book
+(
+   bk_id                int(10) not null auto_increment,
+   bk_name              char(10) not null,
+   primary key (bk_id)
+);
+
+/*==============================================================*/
+/* Table: dengji                                                */
+/*==============================================================*/
+create table dengji
+(
+   bk_id                int not null,
+   user_id              int not null,
+   primary key (bk_id, user_id)
+);
+
+/*==============================================================*/
+/* Table: jiyie                                                 */
+/*==============================================================*/
+create table jiyie
+(
+   userid               int not null,
+   bokid                int not null,
+   user_id              int not null,
+   primary key (userid, bokid, user_id)
+);
+
+/*==============================================================*/
+/* Table: "return"                                              */
+/*==============================================================*/
+create table "return"
+(
+   userid               int not null,
+   bokid                int not null,
+   bk_id                int not null,
+   primary key (userid, bokid, bk_id)
+);
+
+alter table dengji add constraint FK_dengji foreign key (bk_id)
+      references book (bk_id) on delete restrict on update restrict;
+
+alter table dengji add constraint FK_dengji2 foreign key (user_id)
+      references UserId (user_id) on delete restrict on update restrict;
+
+alter table jiyie add constraint FK_jiyie foreign key (userid, bokid)
+      references Borrowing (userid, bokid) on delete restrict on update restrict;
+
+alter table jiyie add constraint FK_jiyie2 foreign key (user_id)
+      references UserId (user_id) on delete restrict on update restrict;
+
+alter table "return" add constraint FK_return foreign key (userid, bokid)
+      references Borrowing (userid, bokid) on delete restrict on update restrict;
+
+alter table "return" add constraint FK_return2 foreign key (bk_id)
+      references book (bk_id) on delete restrict on update restrict;
+```
-- 
Gitee