PHP和MySQL Web开发从新手到高手,第3天-数据库设计

CREATE TABLE `author` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  `password` char(32) DEFAULT NULL,
  `email` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=2827009 DEFAULT CHARSET=utf8

CREATE TABLE `authorrole` (
  `authorid` int(11) NOT NULL,
  `roleid` varchar(255) NOT NULL,
  PRIMARY KEY (`authorid`,`roleid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

CREATE TABLE `category` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `name` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=21 DEFAULT CHARSET=utf8

CREATE TABLE `joke` (
  `id` int(11) NOT NULL AUTO_INCREMENT,
  `joketext` text,
  `jokedate` date NOT NULL,
  `authorid` int(11) DEFAULT NULL,
  `visible` enum(‘NO‘,‘YES‘) NOT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB AUTO_INCREMENT=72 DEFAULT CHARSET=utf8

CREATE TABLE `jokecategory` (
  `jokeid` int(11) NOT NULL,
  `categoryid` int(11) NOT NULL,
  PRIMARY KEY (`jokeid`,`categoryid`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8

CREATE TABLE `role` (
  `id` varchar(255) NOT NULL,
  `description` varchar(255) DEFAULT NULL,
  PRIMARY KEY (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8