sql，将一天所有记录按小时划分

mysql:

select

date_format(H_TIME,'%H') as HOUR,

ROUND(AVG(H_TEMPERATURE),1) as TEMP,

ROUND(AVG(H_HUMIDITY),1) as HUMIDITY

FROM  HOME_MONITOR  Where date_format(H_TIME,'%Y-%m-%d') =  '2016-03-09'  

group by date_format(H_TIME,'%H')

order by date_format(H_TIME,'%H') desc

 

 

oracle:

select

to_char(H_TIME,'HH24') as HOUR,

AVG(H_TEMPERATURE) as TEMP,

AVG(H_HUMIDITY) as HUMIDITY

FROM  HOME_MONITOR  Where to_char(H_TIME,'yyyy-MM-dd') =  '2016-03-09'  

group by to_char(H_TIME,'HH24')

order by to_char(H_TIME,'HH24') desc 

来自为知笔记(Wiz)