text: DROP TABLE IF EXISTS msg_0;
  DROP TABLE IF EXISTS msg_1;
  DROP TABLE IF EXISTS msg_2;
  
  CREATE TABLE `msg_0` (
    `id` bigint(21) NOT NULL AUTO_INCREMENT,
    `uid` int(11) NOT NULL,
    `content` varchar(25) NOT NULL,
    PRIMARY KEY (`id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  
  CREATE TABLE `msg_1` (
    `id` bigint(21) NOT NULL AUTO_INCREMENT,
    `uid` int(11) NOT NULL,
    `content` varchar(25) NOT NULL,
    PRIMARY KEY (`id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  
  CREATE TABLE `msg_2` (
    `id` bigint(21) NOT NULL AUTO_INCREMENT,
    `uid` int(11) NOT NULL,
    `content` varchar(25) NOT NULL,
    PRIMARY KEY (`id`)
  ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
  