How to get a sliding average value for periodic stored values.

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May 27th, 2004, 04:09 PM

MiaWie

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Join Date: May 2004

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How to get a sliding average value for periodic stored values.

Hi experts,

you are nearly my last chance to solve a sql problem. I hope that someone can help me.

Keywords: average, time offset, data period

I want to get data from a database in Excel to calculate a mathematic model. The problem is, that the model requires averaged data. I have 26 variables, which are stored every 10 seconds. What I would like to get is a sliding average value with 5 minutes before and five minutes after a specific time.

+---------------------+---------+-------------

| DateTime | Value 1 | Avg(Value1)

|---------------------+---------+-------------

|3/14/2003 2:55:00 PM | 856 | 850

|3/14/2003 2:56:00 PM | 850 | 851

|3/14/2003 2:57:00 PM | 852 | 851

|3/14/2003 2:58:00 PM | 600 | 850

|3/14/2003 2:59:00 PM | 860 | 849

|3/14/2003 3:00:00 PM | 854 | 850

|3/14/2003 3:01:00 PM | 850 | 850

|3/14/2003 3:02:00 PM | 849 | 849

|3/14/2003 3:03:00 PM | 865 | 850

|3/14/2003 3:04:00 PM | 851 | 850

|3/14/2003 3:05:00 PM | 849 | 850

|3/14/2003 3:06:00 PM | 855 | 851

What I have now is:

SELECT

CONVERT(VARCHAR(10), DateTime, 110) + ' ' + CONVERT(VARCHAR(2), DateTime, 108) + ':' + CONVERT(VARCHAR(2), FLOOR(DATEPART(mi, DateTime) / 5) * 5) AS 'Five Minute Period Starting',

TagName,

AVG(Value) AS 'Average'

FROM Runtime..AnalogHistory

WHERE

TagName IN ('Variable1', 'Varable2', 'Variable3') AND

DateTime >= '3/14/2003 2:55' AND

DateTime < '3/17/2003 11:00' AND

wwRetrievalMode = 'DELTA'

GROUP BY

CONVERT(VARCHAR(10), DateTime, 110) + ' ' + CONVERT(VARCHAR(2), DateTime, 108) + ':' + CONVERT(VARCHAR(2), FLOOR(DATEPART(mi, DateTime) / 5) * 5),

TagName

With this code I can get the average from the values in a five minute data period. This code doesn’t calculate a sliding average. But I need a sliding average to set a time offset or to get data period from, for example, an average value every two minutes.

I’m not sure if I’m describing my problem clearly.

Thanks a lot for your help in advance.

Best regards

Melanie

May 28th, 2004, 11:20 AM

sbaxter

Moderator: Access, SQL

Join Date: Oct 2003

Posts: 5,126

Time spent in forums: 4 Days 1 h 2 m 51 sec
Reputation Power: 13

You will need something similar to this

Select DateTime, Value, (Select Avg(Value) from Table1 Where Table1.DateTime between (t.DateTime +5 min) and t.DateTime - 5 min)) as 'Average' From Table1 as T

S-

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