`files` table schema

CREATE TABLE IF NOT EXISTS `files` (
  `id` INT(11) UNSIGNED NOT NULL AUTO_INCREMENT,
  `id_user` INT(11) DEFAULT NULL,
  `flag_converted` TINYINT(1) DEFAULT '0' COMMENT '0 - not converted, 1 - converted',
  `flag_error` TINYINT(1) DEFAULT '0' COMMENT '0 - no errors, 1 - error occurred',
  `rating` INT(11) UNSIGNED DEFAULT NULL COMMENT '1-5',
  PRIMARY KEY (`id`)
) DEFAULT CHARSET=utf8;


INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (NULL, 0, 0, NULL);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (NULL, 1, 0, 5);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (NULL, 1, 0, 5);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (NULL, 0, 1, 2);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (1, 0, 0, NULL);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (1, 1, 0, 5);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (1, 0, 1, 2);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (2, 0, 0, NULL);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (3, 1, 0, 5);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (3, 1, 0, 5);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (4, 0, 1, 2);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (4, 0, 1, 2);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (4, 0, 1, 2);
INSERT INTO `files` (`id_user`, `flag_converted`, `flag_error`, `rating`) VALUES (4, 0, 1, 2);