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Getting a total in $
I have a table with a Gross Sales field and a Total Costs field, there is a
third field called Net Sales. How can I create a function to take Gross Sales minus Total Costs to populate the Net Sales field? All three are set to currency. |
#2
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Getting a total in $
Rob H,
In your table... you don't. Since you have the GrossSales and the TotalCosts in your table, then you can always calculate NetSales "on the fly" in any form, query, or report. = GrossSales - TotalCosts As a general normalization rule... don't store any values in a table, that can be derived from data you already have. -- hth Al Campagna Microsoft Access MVP 2007-2009 http://home.comcast.net/~cccsolutions/index.html "Find a job that you love... and you'll never work a day in your life." "Rob H" wrote in message ... I have a table with a Gross Sales field and a Total Costs field, there is a third field called Net Sales. How can I create a function to take Gross Sales minus Total Costs to populate the Net Sales field? All three are set to currency. |
#3
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Getting a total in $
On Sun, 21 Mar 2010 08:34:01 -0700, Rob H
wrote: I have a table with a Gross Sales field and a Total Costs field, there is a third field called Net Sales. How can I create a function to take Gross Sales minus Total Costs to populate the Net Sales field? All three are set to currency. You don't. The net sales should SIMPLY NOT EXIST in your table. Storing derived data such as this in your table accomplishes three things: it wastes disk space; it wastes time (almost any calculation will be MUCH faster than a disk fetch); and most importantly, it risks data corruption. If one of the underlying fields is subsequently edited, you will have data in your table WHICH IS WRONG, and no automatic way to detect that fact. Just redo the calculation whenever you need it; you can do so in a Query by putting an expression like NetSales: [Gross Sales] - [Total Costs] in a vacant Field cell in the query, or on a Form or Report by putting =[Gross Sales] - [Total Costs] as the Control Source of a textbox. -- John W. Vinson [MVP] |
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