id_, video_id_, student_id_, content_, evaluate_time_ SELECT u.id_ AS userId, u.username_ AS userName, u.real_name_ AS realName, u.avatar_ AS avatar, e.is_teacher_ AS isTeacher, e.id_ AS evaluateId, e.content_ AS content, e.evaluate_time_ AS evaluateTime FROM video_lesson_evaluate e LEFT JOIN sys_user u ON e.student_id_ = u.id_ WHERE video_id_ = #{param.videoId}