Queries are used in Access in order to summarize exactly the information you need from the database tables. Quite often you will not need the basic information but calculated information. As an example if you want to express the age and not the birth date of a person. In such cases you will need to add a calculated field to the query.
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Access 2007
Calculated Fields:
This video will show you how to add calculations to your queries.
(5 Min.)