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Nilone
 
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Default Re: Looking for elegant solution to sensor / reading / alert database design. - 12-09-2010 , 06:00 PM





On Dec 10, 1:57*am, Nilone <rea... (AT) gmail (DOT) com> wrote:
Quote:
CREATE VIEW SensorLimitsExceeded AS
SELECT a.Sensor, a.Time, a.Reading, a.Time - b.Time AS AlertDuration
* FROM SensorReadings cur, SensorReadings prv, SensorLimits lim
*WHERE cur.Sensor = prv.Sensor
* *AND cur.Reading NOT BETWEEN lim.LowerLimit AND lim.UpperLimit
* *AND prv.Time = (SELECT Max(hst.Time) FROM SensorReadings hst,
SensorLimits lmh
*WHERE hst.Sensor = cur.Sensor AND hst.Sensor = lmh.Sensor
* *AND hst.Time < cur.Time
* *AND hst.Reading BETWEEN lmh.LowerLimit AND lmh.UpperLimit)
Oops, replace a and b with cur and prv, respectively.

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