t_letter.letter_id, t_letter.notice_id, t_letter.sort, t_letter.disabled_flag, t_letter.deleted_flag, t_letter.user_id, t_letter.update_time, t_letter.create_time SELECT FROM t_letter SELECT COUNT(1) FROM t_letter WHERE t_letter.user_id = #{userId} AND t_letter.create_time >= DATE_SUB(CURDATE(), INTERVAL 1 YEAR)