创建、删除表

//创建表
create table user(
   tutorial_id INT NOT NULL AUTO_INCREMENT,
   tutorial_title VARCHAR(100) NOT NULL,
   tutorial_author VARCHAR(40) NOT NULL,
   submission_date DATE,
   PRIMARY KEY ( tutorial_id )
);
Query OK, 0 rows affected (0.61 sec)


//创建banner表
create table banner(
   id INT NOT NULL AUTO_INCREMENT,
   img_url varchar(255)  NOT NULL,
   web_url text  NOT NULL,
   addtime datetime,
   PRIMARY KEY ( id )
);


//创建表3
create table room(
  `uid` int(11) COMMENT '用户ID',
  `subject` varchar(50) CHARACTER SET utf8mb4 DEFAULT NULL COMMENT '房间标题',
  `praise_num` int(20) DEFAULT '0' COMMENT '点赞数',
  `gold_num` int(20) DEFAULT '0' COMMENT '本直播获得贝壳数',
  `watch_num` int(11) DEFAULT '0' COMMENT '观看次数',
  `review_url` varchar(200) COLLATE utf8mb4_unicode_ci DEFAULT NULL COMMENT '回放地址URL',
  `addtime` timestamp NULL DEFAULT CURRENT_TIMESTAMP COMMENT '创建时间',
  `endtime` timestamp NULL DEFAULT NULL COMMENT '结束时间',
   PRIMARY KEY ( uid )
);


//删除表
DROP TABLE user;