When you run your parameter query, Access uses the data types you chose in the Query Parameters dialog box to validate the data that is entered. For instance, if you chose the Date/Time data type and entered 31-Feb-2004 (a date that could never occur), Access displays an error message that says, "The value you entered isn't valid for this field," and you'll have to re-enter the date. When you enter a parameter in the Query Parameters dialog box and don't specify a data type, Access converts the value entered into the Text data type.
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