Subtracting Values From Two Consecutive Records

Jan 17, 2006

I am having a problem, probably due to my inexperience with Access. Here is the seniero:

-I have a form/table set up for operators to enter numbers on a daily basis.
-I am setting up queries/reports to display not only the entered data, but also calculated values from the entered values
--I have no idea on how to subtract a previous day's value from today's value and report that value.
- Since Access gives no "ownership" to any value I do not know how to reference yesterday's value in today's calculation.Any Ideas?

Example
Record #1
Date - 1/17/06
Value - 15,232

Record #2
Date - 1/16/05
Value - 14,111

Desired output
Date 1/17/06
Value - 1121

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2 5
3 2
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Jan 25, 2006

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Code:

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Code:

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Please look at the following tables below for an example. The Item table has ItemCode as a primary key. The Bids Table has multiple rows for each ItemCode showing bids for the item:

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I have a query A, that gives me the a set of numbers.
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