每两小时分组查询
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2021-03-31 21:43:33
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SELECT
sum(water_flow) as water_flow,created_time,
CASE
WHEN DATE_FORMAT(created_time ,'%H') >= 0 and DATE_FORMAT(created_time ,'%H') < 2 then '2'
WHEN DATE_FORMAT(created_time ,'%H') >= 2 and DATE_FORMAT(created_time ,'%H') < 4 then '4'
WHEN DATE_FORMAT(created_time ,'%H') >= 4 and DATE_FORMAT(created_time ,'%H') < 6 then '6'
WHEN DATE_FORMAT(created_time ,'%H') >= 6 and DATE_FORMAT(created_time ,'%H') < 8 then '8'
WHEN DATE_FORMAT(created_time ,'%H') >= 8 and DATE_FORMAT(created_time ,'%H') < 10 then '10'
WHEN DATE_FORMAT(created_time ,'%H') >= 10 and DATE_FORMAT(created_time ,'%H') < 12 then '12'
WHEN DATE_FORMAT(created_time ,'%H') >= 12 and DATE_FORMAT(created_time ,'%H') < 14 then '14'
WHEN DATE_FORMAT(created_time ,'%H') >= 14 and DATE_FORMAT(created_time ,'%H') < 16 then '16'
WHEN DATE_FORMAT(created_time ,'%H') >= 16 and DATE_FORMAT(created_time ,'%H') < 18 then '18'
WHEN DATE_FORMAT(created_time ,'%H') >= 18 and DATE_FORMAT(created_time ,'%H') < 20 then '20'
WHEN DATE_FORMAT(created_time ,'%H') >= 20 and DATE_FORMAT(created_time ,'%H') < 22 then '22'
WHEN DATE_FORMAT(created_time ,'%H') >= 22 and DATE_FORMAT(created_time ,'%H') < 24 then '24'
END AS `c_hour`
from wlsq_data.water_flow
where to_days(created_time) = to_days(now())
GROUP BY c_hour
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