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Microsoft Accesss 2010 : Enhancing the Queries That You Build - Creating and Running Parameter Queries

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11/16/2014 7:55:43 PM

You might not always know the parameters for the query output when you’re designing a query—and your application’s users also might not know the parameters. Parameter queries let you specify specific criteria at runtime so that you don’t have to modify the query each time you want to change the criteria.

For example, imagine you have a query, like the one shown in Figure 1, for which you want users to specify the date range they want to view each time they run the query. You have entered the following clause as the criterion for the Order Date field:

Between [Enter Starting Date] And [Enter Ending Date]

Figure 1. A Parameter query that prompts for a starting date and an ending date.

This criterion causes two dialog boxes to appear when the user runs the query. The first one, shown in Figure 2, prompts the user with the text in the first set of brackets. Access substitutes the text the user types for the bracketed text. A second dialog box appears, prompting the user for whatever is in the second set of brackets. Access uses the user’s responses as criteria for the query.

Figure 2. A dialog box that appears when a Parameter query is run.
 
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