You will need to add a field to your database to show the date it was created. Then add to your query string something like AND DBDATE > (TODAY - 90).
The actual language will vary depending on the version of Access you're using.
You can get the actual language from MS Access, by opening the sample NORTHWIND database. Open Queries, then open "Product sales for 1994" and then VIEW SQL.
on my version, it looks like this.
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SELECT DISTINCTROW Categories.CategoryName, Products.ProductName, Sum(CCur([Order Details].[UnitPrice]*[Quantity]*(1-[Discount])/100)*100) AS ProductSales
FROM (Categories INNER JOIN Products ON Categories.CategoryID = Products.CategoryID) INNER JOIN (Orders INNER JOIN [Order Details] ON Orders.OrderID = [Order Details].OrderID) ON Products.ProductID = [Order Details].ProductID
WHERE (((Orders.ShippedDate) Between #1/1/94# And #12/31/94#))
GROUP BY Categories.CategoryName, Products.ProductName;
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Now look at the WHERE ((( orders. shoppeddate) line, and change it to fit the "today - 90" and you should have it.
