update aim_place_position
set front_level_id = null
where id in (select id
             from (select a1.id
                   from aim_place_position a1
                            left join aim_place_position a2 on a1.front_level_id = a2.id
                   where a1.front_level_id is not null
                     and a2.id is null) t);

update land_mark
set front_level_id = null
where id in (select id
             from (select a1.id
                   from land_mark a1
                            left join land_mark a2 on a1.front_level_id = a2.id
                   where a1.front_level_id is not null
                     and a2.id is null) t);

update area_info
set template_id = null
where id in (select id
             from (select area_info.id
                   from area_info
                            left join aim_group_info on area_info.template_id = aim_group_info.id
                   where area_info.template_id is not null
                     and aim_group_info.id is null) t);

update thing_info
set template_id = null
where id in (select id
             from (select thing_info.id
                   from thing_info
                            left join aim_group_info on thing_info.template_id = aim_group_info.id
                   where thing_info.template_id is not null
                     and aim_group_info.id is null) t);