select id,FLOOR(id/4) hourGroup
, case FLOOR(id/4)
when 0 then '00:00~04:00'
when 1 then '04:00~08:00'
when 2 then '08:00~12:00'
when 3 then '12:00~16:00'
when 4 then '16:00~20:00'
when 5 then '20:00~00:00' end hourRange
from (
select 0 as id union
select 1 as id union
select 2 as id union
select 3 as id union
select 4 as id union
select 5 as id union
select 6 as id union
select 7 as id union
select 8 as id union
select 9 as id union
select 10 as id union
select 11 as id union
select 12 as id union
select 13 as id union
select 14 as id union
select 15 as id union
select 16 as id union
select 17 as id union
select 18 as id union
select 19 as id union
select 20 as id union
select 21 as id union
select 22 as id union
select 23 as id
) t
order by id ;
mysql 每4小时统计一次数据
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