Update Average From Different Rows In One Column To Another Row In The Same Table

Aug 2, 2012

I am still quite new to Access and have spend the last two days looking for a solution to an issue but don't seem to find anything that fits. The problem is that I want the three year average of [NIbyA] inserted in [AvgNIbyA]. The years are stored in [FocalYear] (as Date/Time formate) and [TextYear] (as text formate) and [ID] indicates which entity the record belongs to (see below).

UniqueID
ID
TextYear
FocalYear
NIbyA
AvgNIbyA
1020180-19981231
1020180
19981231

[Code]...

Example.accdb

I have been playing around with update queries but can not seem to get the syntax right. The query needs to add NIbyA for year 1998, 1999 and 2000, divide it by 3 (or use Avg() function or something of that sort) and insert the result into the row where [FocalYear] = 13/12/2000. To add to the confusion, it should obviously only add those records that belong to the same ID. Years are from 1998 to 2010 and ID's are random (this obviously means that the rows where [FocalYear] = 13/12/1998 and [FocalYear] = 13/12/1999 will not have an entry).

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A
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[code]....

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time tag value
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10:03 Tag1 10
10:03 Tag2 11
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10:05 Tag1 10
10:05 Tag2 12
10:06 Tag1 10
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10:07 Tag1 11
10:07 Tag2 12
10:08 Tag1 11
10:08 Tag2 11

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10:08 Tag2 11
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