Subtracting One Query From Another?

Feb 23, 2008

Hi everyone,

I am familiar with databases and basic SQL, but never used Access, so your help is greatly appreciated!

What I *think* I need to do here is take the results from one query, subtract another query from that, then create a table of the results, so that I can make a chart in a report. I say that I *think* I need do that because Iím not confident that this approach is the best but thatís a whole other story...

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:

Item Table
ItemCode Date Address
JH231 2008-Feb-20 123 Test St.
KH831 2008-Feb-21 512 Test St.

Bids Table
ItemCode Amount
JH231 100.00
JH231 60.00
JH421 310.00
KH831 20.00
KH831 40.00
KH831 10.00
KH831 90.00

To make a pretty graph, I would like a table (so a query, or macro, or VBA or something?) that returns the minimum Amount for an ItemCode subtracted from the maximum Amount for an ItemCode based on the example above. What I would end up is something like this:

ItemCode Difference Between Maximum and Minimum
JH321 250
KH831 80.00

I hope this is clear. Any help on how to do this from you Access pros would be great, OR if Iím taking the wrong approach, suggestions on what I should try next. Thanks!!!


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