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using the domain functions in this type of query is going to be amazingly slow. &nbsp;Generally, when I need to do something like this, I include the same table in the query twice and use a non-equi join to match three months worth of records from one table to a single record on the other record.<br />
<br />
Select T.Area, T.ProductID, T.TransactionDate, T.Sales, SUM(T.Sales) as 3MonAvg<br />
FROM Table1 as T<br />
LEFT JOIN Table1 as TAvg <br />
ON T.Area = TAvg.Area <br />
AND T.ProductID = TAvg.ProductID<br />
AND TAvg.TransactionDate &gt;= DateAdd(&quot;m&quot;, -3, T.TransactionDate<br />
AND TAvg.TransactionDate &lt;&nbsp;T.TransactionDate<br />
GROUP BY T.Area, T.ProductID, T.TransactionDate, T.Sales<br />
<br />
You will not be able to do all of this in the query grid, and if you try to view it in the grid after you write the SQL you will get a message that Access is unable to represent the join in the grid. &nbsp;So what I usually do is add the tables to the grid, add all of the columns, add the joins on Area, ProductID and Transaction date, then move to the SQL view and tweak the SQL.<br />
<br />
HTH<br />
Dale
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Hi Rgonzo1971,<br />
it works nicely but I'm missing the third criteria &quot;Area&quot;. Is there an easy way to include it to the code?
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<div class="content wysiwyg-content">
Looking for a way to calculate a three month average with three criterias (Transaction date, Area and product id).<br />
<br />
<b>Current code is:</b> MovingAverage: DAvg(&quot;Sales&quot;,&quot;Table1&quot;,&quot;Are<wbr />a ='&quot; &amp;&nbsp;[Area] &amp;&nbsp;&quot;' AND Month(format(TransactionDa<wbr />te,'mm/dd/<wbr />yyyy') &lt;&quot;&nbsp;&amp; (Month(Format([Transaction<wbr />Date],'mm/<wbr />dd/yyyy')+<wbr />2)\3))<br />
<br />
Struggeling with the Transaction date as I only receive an error in the query (the data is only monthly and all data is therefor set to 1/1/2015 for Jan and 2/1/2015 for feb).<br />
<br />
I would also need product ID to be part of the criteria for the three month moving average. <br />
<br />
Any suggestions? &nbsp;I've attached the test database as well.<br />
<a href="https://filedb.experts-exchange.com/incoming/2016/03_w12/1086875/3-16-2016-11-30-03-AM.png" target="_blank" class="file-inline" title="3-16-2016-11-30-03-AM.png (11 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>3-16-2016-11-30-03-AM.png</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2016/03_w12/1086876/3-16-2016-11-30-18-AM.png" target="_blank" class="file-inline" title="3-16-2016-11-30-18-AM.png (17 KB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>3-16-2016-11-30-18-AM.png</a><br />
<a href="https://filedb.experts-exchange.com/incoming/2016/03_w12/1086877/TEST--2---4-.mdb" target="_blank" class="file-inline" title="TEST--2---4-.mdb (3.5 MB)"><svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 512 512"><path d="M67.508 468.467c-58.005-58.013-58.016-151.92 0-209.943l225.011-225.04c44.643-44.645 117.279-44.645 161.92 0 44.743 44.749 44.753 117.186 0 161.944l-189.465 189.49c-31.41 31.413-82.518 31.412-113.926.001-31.479-31.482-31.49-82.453 0-113.944L311.51 110.491c4.687-4.687 12.286-4.687 16.972 0l16.967 16.971c4.685 4.686 4.685 12.283 0 16.969L184.983 304.917c-12.724 12.724-12.73 33.328 0 46.058 12.696 12.697 33.356 12.699 46.054-.001l189.465-189.489c25.987-25.989 25.994-68.06.001-94.056-25.931-25.934-68.119-25.932-94.049 0l-225.01 225.039c-39.249 39.252-39.258 102.795-.001 142.057 39.285 39.29 102.885 39.287 142.162-.028A739446.174 739446.174 0 0 1 439.497 238.49c4.686-4.687 12.282-4.684 16.969.004l16.967 16.971c4.685 4.686 4.689 12.279.004 16.965a755654.128 755654.128 0 0 0-195.881 195.996c-58.034 58.092-152.004 58.093-210.048.041z"/></svg>TEST--2---4-.mdb</a>
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TEST--2---4-.mdb

3-16-2016-11-30-03-AM.png

3-16-2016-11-30-18-AM.png

Looking for a way to calculate a three month average with three criterias (Transaction date, Area and product id).

Current code is: MovingAverage: DAvg("Sales","Table1","Area ='" & [Area] & "' AND Month(format(TransactionDate,'mm/dd/yyyy') <" & (Month(Format([TransactionDate],'mm/dd/yyyy')+2)\3))

Struggeling with the Transaction date as I only receive an error in the query (the data is only monthly and all data is therefor set to 1/1/2015 for Jan and 2/1/2015 for feb).

I would also need product ID to be part of the criteria for the three month moving average. 

Any suggestions?  I've attached the test database as well.

3 Month Moving average with three criterias

Microsoft Access is a rapid application development (RAD) relational database tool. Access can be used for both desktop and web-based applications, and uses VBA (Visual Basic for Applications) as its coding language.