PostgreSQL查询间隔为1分钟，在所有时间范围内累积总和[重复]

Question

到目前为止，我一直在努力处理这个查询，我可以创建 1 分钟的间隔，但是我需要的两列的总和只给出了那个分钟，而不是随时间累积的总和

SELECT
    TIMESTAMP WITH TIME ZONE 'epoch' +
    INTERVAL '1 second' * round(extract('epoch' from "Timestamp") / 60) * 60 as Timestamp",
    SUM("Particles"), sum("Bio")
from "Results" 
where "SampleID" = 50 
GROUP BY round(extract('epoch' from "Timestamp") / 60)
ORDER BY "Timestamp" DESC

这是我正在使用的查询，结果是这些

          Timestamp      |Sum |Sum
"2013-08-09 14:17:00-07" | 61 | 4
"2013-08-09 14:16:00-07" | 64 | 6
"2013-08-09 14:15:00-07" | 29 | 5
"2013-08-09 14:14:00-07" | 96 | 1
"2013-08-09 14:13:00-07" | 43 | 2

但我需要最后两列的累计和

Select
    TIMESTAMP WITH TIME ZONE 'epoch' +
    INTERVAL '1 second' * round(extract('epoch' from "Timestamp") / 60) * 60 as "Timestamp",
    sum("Particles") over (order by "Timestamp") as Cumulative_Part, 
    sum("Bio") over (order by "Timestamp") as Cumulative_Bio from "Results" 
where
    "SampleID" = 50 and
    "Timestamp" between '2013-08-09 14:13:00' and '2013-08-09 14:17:00'
GROUP BY round(extract('epoch' from "Timestamp") / 60)
Order by "Timestamp" DESC

Answer 1

如果你有 postgresql 8.4 或更高版本，你可以使用OVER(ORDER BY..) 构造

SELECT...
, SUM("Particles") OVER(ORDER BY TimeStamp_Field) as SUM_Particles
...

查看here了解更多信息