如下两种的表达效果是一样
方法一：
select
tm ,
count(tm) as times
from
(
select
case
when single_times = '1' then 'one_time'
when single_times = '2' then 'two_time'
when single_times = '3' then 'three_time'
when single_times = '4' then 'four_time'
when single_times = '5' then 'five_time'
else 'more_five' end as tm
from
(select count(userid) single_times from test where dt = '2020-10-12' group by userid ) t
) t
group by tm ；
方法二：文章来源：https://www.toymoban.com/news/detail-410695.html
select
tm ,
count(tm) as times
from
(
select
case single_times
when '1' then 'one_time'
when '2' then 'two_time'
when '3' then 'three_time'
when '4' then 'four_time'
when &#文章来源地址https://www.toymoban.com/news/detail-410695.html
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