Microsoft Office Tutorials and References
In Depth Information
Chapter 4: Doing Calculations in Forms and Subforms (and Reports)
Chapter 4: Doing Calculations
in Forms and Subforms
(and Reports)
In This Chapter
Including calculated results on your forms and reports
Using numbers in calculations
Using dates in calculations
Using strings — that is, text — in calculations
Using split forms to display a datasheet on a form
Adding subforms to a form
Totaling and counting information from subforms and subreports
The first three chapters of Book IV explain how to make forms with
all kinds of controls, showing information in all kinds of ways. In the
process, you find out how to create reports, because creating and editing
reports is so similar to working with forms. Up to this point, all the
information you’ve dealt with is sitting there waiting for you, nicely contained in
tables and queries. How about calculating data that isn’t stored anywhere?
Your forms and reports can calculate and display information that you can
also store in the record source for the form (that is, store the results so you
can use them in other objects). You may want the Order form for an online
store, for example, to calculate the total price of all items ordered, the sales
tax, and the grand total for the order.
In addition to calculating numbers, you can perform text, date, and logical
calculations, giving Access instructions such as “If Tax Exempt is True,
Sales Tax is 0; otherwise, it’s Tax Rate times Product Total.” Text
calculations include things such as keeping only the first five digits of a zip
code or capitalizing a text entry.
Doing Elementary Calculations
The title of this section sounds like algebra class, doesn’t it? Don’t worry;
creating calculated values for your forms won’t cause you to scream in
terror, the way your high school algebra teacher did. You’ll recognize some
arithmetic signs (especially the equal sign), but all the calculations are easy.
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