id_, class_group_id_, user_id_, create_time_, status_ class_group_student_mapper.id_, class_group_student_mapper.class_group_id_, class_group_student_mapper.user_id_, class_group_student_mapper.create_time_, class_group_student_mapper.status_ SELECT s.real_name_ as name,s.avatar_ as avatar,m.class_group_id_ as classGroupId,s.id_ as userId,c.music_group_id_ as musicGroupId from class_group_student_mapper m LEFT JOIN class_group c on m.class_group_id_ = c.id_ LEFT JOIN sys_user s on m.user_id_ = s.id_ where c.music_group_id_ = #{musicGroupId} SELECT class_group_student_mapper.* FROM class_group_student_mapper LEFT JOIN class_group ON class_group_student_mapper.class_group_id_ = class_group.id_ LEFT JOIN `subject` ON `subject`.id_ in (class_group.subject_id_list_) where class_group_student_mapper.class_group_id_ = #{query.groupId} and class_group_student_mapper.status_ in ('NORMAL', 'LEAVE') and subject.id_ = #{query.subjectId}