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+2023年9月11日
+
+星期一
+
+今日学习
+
+学会需求分析  学作ER图  
+
+```sql
+CREATE DATABASE dianying CHARSET utf8;
+use dianying;
+/*==============================================================*/
+/* DBMS name:      MySQL 5.0                                    */
+/* Created on:     2023/9/12 10:41:02                           */
+/*==============================================================*/
+
+
+drop table if exists Filmcritics;
+
+drop table if exists film;
+
+drop table if exists movietype;
+
+/*==============================================================*/
+/* Table: Filmcritics                                           */
+/*==============================================================*/
+create table Filmcritics
+(
+   ID                   int,   
+   Username             varchar(20) not null,
+   filmname             varchar(20) not null,
+   Usercomments         varchar(20) not null,
+	 moviename            varchar(20) not null,
+   primary key (Username)
+);
+
+INSERT into Filmcritics (ID,Username,filmname,Usercomments,moviename) VALUES
+(1,'小李','奥本海默','看之前以为奥本海默，看完才意识到他其','奥本海默'),
+(2,'小王','小李飞刀','“有一天，当他们对你的惩罚足够多时','小李飞刀'),
+(3,'小猪','奥本海默','又白又男又有点好看，。','奥本海默'),
+(4,'朱碧池','过往人生','全片最喜欢的三段 ','过往人生'),
+(5,'王总','牛栏山的故事','从没看过一部电影','牛栏山的故事'),
+(6,'刘总','星际穿越','三小时听力考试','星际穿越');
+
+/*==============================================================*/
+/* Table: film                                                  */
+/*==============================================================*/
+create table film
+(
+   filmname             varchar(20) not null,
+   type                 varchar(6) not null,
+   Showtime             time not null,
+   Duratioofplayback    time not null,
+   language             varchar(2) not null,
+   directorname         varchar(20) not null,
+   screenwriter         varchar(20) not null,
+   actorname            varchar(20) not null,
+   filmtype             varchar(6) not null,
+   primary key (filmname)
+);
+INSERT into film (filmname,type,Showtime,Duratioofplayback,language,directorname,screenwriter,actorname,filmtype) VALUES
+('奥本海默'	,'英语'	,'02:20:23'	,'02:01:29'	,'英语'	,'奥本海默'	,'奥本海默'	,'奥本海默',	'戏剧'),
+('牛栏山的故事'	,'汉语',	'19:29:15'	,'01:29:30'	,'汉语'	,'大鹏'	,'大鹏'	,'大鹏'	,'喜剧');
+
+/*==============================================================*/
+/* Table: movietype                                             */
+/*==============================================================*/
+create table movietype
+(
+   type                 varchar(6) not null,
+   primary key (type)
+);
+INSERT into movietype (type) VALUES
+('汉语'),
+('英语'),
+('韩语');
+
+
+alter table Filmcritics add constraint FK_comments foreign key (filmname)
+      references film (filmname) on delete restrict on update restrict;
+
+alter table film add constraint FK_relationship foreign key (type)
+      references movietype (type) on delete restrict on update restrict;
+
+
+
+```