id,user_id,course_id, hour_id,total_duration,finished_duration, real_duration,is_finished,finished_at, created_at,updated_at select `t1`.* from `user_course_hour_records` as `t1` inner join (select `course_id`, max(`updated_at`) as `latest_at` from `user_course_hour_records` where `user_id` = #{userId} group by `course_id`) as `t2` on `t2`.`course_id` = `t1`.`course_id` and `t2`.`latest_at` = `t1`.`updated_at` order by `t1`.`updated_at` desc limit #{size}; SELECT `course_id`, count(1) AS `total` FROM `user_course_hour_records` WHERE `user_id` = #{userId} AND `course_id` IN (#{courseId}) AND `is_finisehd` = #{isFinished} GROUP BY `course_id`; SELECT * FROM `user_course_hour_records` as `t` AND `t`.`user_id` = #{userId} AND `t`.`is_finisehd` = #{isFinished} ORDER BY `t`.`finished_at` ASC ORDER BY `t`.`created_at` ASC ORDER BY `t`.`updated_at` ASC ORDER BY `t`.`real_duration` ASC ORDER BY `t`.`id` ASC ORDER BY `t`.`finished_at` DESC ORDER BY `t`.`created_at` DESC ORDER BY `t`.`updated_at` DESC ORDER BY `t`.`real_duration` DESC ORDER BY `t`.`id` DESC LIMIT #{pageStart}, #{pageSize}; SELECT count(1) FROM `user_course_hour_records` as `t` AND `t`.`user_id` = #{userId} AND `t`.`is_finisehd` = #{isFinished}