select to_char(t.createtime, 'yyyyMM') create_month,
count(*) cnt
sum(count(*)) over(order by to_char(t.createtime, 'yyyyMM')) sum_cnt -- the value what you want!
from t_userinfo t
where t.status = 0
group by to_char(t.createtime, 'yyyyMM')
order by create_month;