merge into ${rangeTableName} a
using (
select a.pk_member, max(a.new_level) pk_grade
from cu_member_grade a
inner join(
select pk_member, max(nvl(modified_time, creation_time)) creation_time
from cu_member_grade
where period = #{period}
and del_flag = 0
and up_type = 2
group by pk_member) b
on a.pk_member = b.pk_member and nvl(a.modified_time, a.creation_time) = b.creation_time
group by a.pk_member
) b
on (a.pk_member = b.pk_member)
when matched then
update set
a.pk_grade = b.pk_grade