Final answer:
Clearing the check box for a field in the query design grid means the field will not be displayed in the query results, but can still be used for filtering or calculations within the query.
Step-by-step explanation:
When you clear the check box for a field in the design grid portion of the query design window in a database program like Microsoft Access, you are telling the database not to display that field in the results of the query. However, even though the field will not be visible in the query results, it can still be used in calculations or criteria within the query. This means you could use that field to filter results without it appearing in the final output.
For instance, if you have a table with fields for "Name", "Age", and "City" and you only want to display the "Name" field, you can uncheck "Age" and "City". Those fields won't appear in your query result, but you could still use "Age" to retrieve only records of people who are over a certain age, without showing the age in your results.