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我有一系列排放數據時間序列。我想選擇某些高峯事件。 我所做的就是計算treshold,並提出與超過時間的表:如何在MySQL中對以下日期進行分組
%create the treshold value
select min(dummie.value) from (select top 5 percent value from timevalues where id =
(select id from source where type = 'observation') as dummie) as treshold
%view every time where the value is higher then treshold
select name, time, value from timevalue, catchment
where timevalue.sourceID = source.id
and where source.id = catchment.sourceID
and where value >= treshold.value
as exceed_table
現在我想所有的值是這個treshold以上,再算上他們有多少人的時間。有沒有辦法刪除所有的數據?
謝謝!