From 3048292a6448eb5b0809a2a0695eaf0c57538a93 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=88=98=E6=99=BA=E7=BF=94?= <2045602860@qq.com>
Date: Thu, 14 Sep 2023 04:07:23 +0000
Subject: [PATCH] =?UTF-8?q?34=20=E5=88=98=E6=99=BA=E7=BF=94?=
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Signed-off-by: 刘智翔 <2045602860@qq.com>
---
 ...73\347\224\237\347\263\273\347\273\237.md" | 98 +++++++++++++++++++
 1 file changed, 98 insertions(+)
 create mode 100644 "34 \345\210\230\346\231\272\347\277\224/\345\214\273\347\224\237\347\263\273\347\273\237.md"

diff --git "a/34 \345\210\230\346\231\272\347\277\224/\345\214\273\347\224\237\347\263\273\347\273\237.md" "b/34 \345\210\230\346\231\272\347\277\224/\345\214\273\347\224\237\347\263\273\347\273\237.md"
new file mode 100644
index 0000000..46dc890
--- /dev/null
+++ "b/34 \345\210\230\346\231\272\347\277\224/\345\214\273\347\224\237\347\263\273\347\273\237.md"	
@@ -0,0 +1,98 @@
+```mysql
+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
+
+/*==============================================================*/
+/* 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;
+
+
+
+```
\ No newline at end of file
-- 
Gitee