如果您的創建時間是日期列,那么這將是微不足道的：

SELECT TO_CHAR(CREATE_TIME,'DAY:HH24'),COUNT(*)

FROM EVENTS

GROUP BY TO_CHAR(CREATE_TIME,'DAY:HH24');

實際上,轉換createtime列并不太難：

select TO_CHAR(

TO_DATE('19700101','YYYYMMDD') + createtime / 86400000),'DAY:HH24') AS BUCKET,COUNT(*)

FROM EVENTS

WHERE createtime between 1305504000000 and 1306108800000

group by TO_CHAR(

TO_DATE('19700101','DAY:HH24')

order by 1

或者,如果您正在尋找fencepost值(例如,從第一個十分位數(0-10％)到下一個十分位數(11-20％),您可以執行以下操作：

select min(createtime) over (partition by decile) as decile_start,max(createtime) over (partition by decile) as decile_end,decile

from (select createtime,ntile (10) over (order by createtime asc) as decile

from events

where createtime between 1305504000000 and 1306108800000

)

總結

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