text: CREATE TABLE IF NOT EXISTS `hashtag` (
    `name` VARCHAR(80) NOT NULL,
    `post_id` INT UNSIGNED NOT NULL,
    `type` ENUM('#', '@') NOT NULL,
    `created_date` DATETIME NULL,
    PRIMARY KEY (`name`, `post_id`),
    INDEX `fk_hashtag_1_idx` (`post_id` ASC),
    CONSTRAINT `fk_hashtag_1`
      FOREIGN KEY (`post_id`)
      REFERENCES `post` (`id`)
      ON DELETE NO ACTION
      ON UPDATE NO ACTION)
  ENGINE = InnoDB
  DEFAULT CHARACTER SET = utf8;
  