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From: =?UTF-8?q?=E5=91=A8=E4=BA=9A=E8=BE=89?= <3192667214@qq.com>
Date: Thu, 14 Sep 2023 04:34:06 +0000
Subject: [PATCH] =?UTF-8?q?41=20=E5=91=A8=E4=BA=9A=E8=BE=89?=
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Signed-off-by: 周亚辉 <3192667214@qq.com>
---
 ...72\344\270\216\350\215\257\345\223\201.md" | 105 ++++++++++++++++++
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 create mode 100644 "41 \345\221\250\344\272\232\350\276\211/20230914\345\214\273\347\224\237\357\274\214\347\227\205\344\272\272\344\270\216\350\215\257\345\223\201.md"

diff --git "a/41 \345\221\250\344\272\232\350\276\211/20230914\345\214\273\347\224\237\357\274\214\347\227\205\344\272\272\344\270\216\350\215\257\345\223\201.md" "b/41 \345\221\250\344\272\232\350\276\211/20230914\345\214\273\347\224\237\357\274\214\347\227\205\344\272\272\344\270\216\350\215\257\345\223\201.md"
new file mode 100644
index 0000000..f6f09be
--- /dev/null
+++ "b/41 \345\221\250\344\272\232\350\276\211/20230914\345\214\273\347\224\237\357\274\214\347\227\205\344\272\272\344\270\216\350\215\257\345\223\201.md"	
@@ -0,0 +1,105 @@
+## 笔记
+
+如果一个主体的属性有多个值，那这个属性就可以拆成一个新主体
+
+## 作业
+
+医生，病人，药品制表
+
+``` mysql
+
+
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023-09-14 08:55:14                          */
+/*==============================================================*/
+
+
+drop table if exists doctor;
+
+drop table if exists drug;
+
+drop table if exists medical;
+
+drop table if exists patients;
+
+drop table if exists prescription;
+
+/*==============================================================*/
+/* Table: doctor                                                */
+/*==============================================================*/
+create table doctor
+(
+   doc_id               int not null auto_increment,
+   doc_no               varchar(20) not null,
+   doc_name             varchar(10) not null,
+   doc_sex              varchar(5),
+   primary key (doc_id)
+);
+
+/*==============================================================*/
+/* Table: drug                                                  */
+/*==============================================================*/
+create table drug
+(
+   dro_id               int not null auto_increment,
+   dro_name             varchar(20) not null,
+   primary key (dro_id)
+);
+
+/*==============================================================*/
+/* Table: medical                                               */
+/*==============================================================*/
+create table medical
+(
+   ca_id                int not null auto_increment,
+   doc_id               int,
+   bat_no               int,
+   date                 date,
+   diagnose             varchar(50),
+   primary key (ca_id)
+);
+
+/*==============================================================*/
+/* Table: patients                                              */
+/*==============================================================*/
+create table patients
+(
+   bat_no               int not null auto_increment,
+   bat_name             varchar(10) not null,
+   bat_age              int,
+   bat_sex              varchar(5),
+   primary key (bat_no)
+);
+
+/*==============================================================*/
+/* Table: prescription                                          */
+/*==============================================================*/
+create table prescription
+(
+   dro_id               int not null,
+   ca_id                int not null,
+   bat_no               int,
+   usa                  varchar(20),
+   dosage               varchar(20),
+   primary key (dro_id, ca_id)
+);
+
+alter table medical add constraint FK_Relationship_1 foreign key (doc_id)
+      references doctor (doc_id) on delete restrict on update restrict;
+
+alter table medical add constraint FK_Relationship_2 foreign key (bat_no)
+      references patients (bat_no) on delete restrict on update restrict;
+
+alter table prescription add constraint FK_Relationship_5 foreign key (bat_no)
+      references patients (bat_no) on delete restrict on update restrict;
+
+alter table prescription add constraint FK_prescription foreign key (dro_id)
+      references drug (dro_id) on delete restrict on update restrict;
+
+alter table prescription add constraint FK_prescription2 foreign key (ca_id)
+      references medical (ca_id) on delete restrict on update restrict;
+```
+
+
+
-- 
Gitee