Joe Yoder wrote on 2014-06-08:
> Scenario:
> - Cursor with 2 fields TimeStamp T, and Value N(4.0) - 1 record per
> second - Output needed - BegStamp as the beginning of a time period
> X seconds long and Avg as the average of the Value field for X
> seconds
> With X = 3600 the results should give the average value for each hour.
>
> I'm stuck on what to use for a group by expression and suspect that the
> best way may be to hard code a pair of loops that increments through the
> cursor one time period at a time.
>
> Does anyone want to show me a better way?
>
> Thanks in advance,
>
> Joe
>
Joe,
I would accomplish this using a subquery.
CREATE CURSOR joe (TimeStamp T, Value n(4))
FOR nn = 1 TO 10000
INSERT INTO joe VALUES (DATETIME() + nn, 1000*RAND())
NEXT
startTime = DATETIME() + 1234
endTime = startTime + 3600 - 1 && fencepost
SELECT grouping, AVG(value) ;
FROM (SELECT value, 1 as grouping ;
FROM joe ;
WHERE TimeStamp between startTime AND endTime) ;
average GROUP BY 1
Tracy Pearson
PowerChurch Software
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