Create a Logical Expression In Microsoft Access a Logical function compares two statements and chooses one answer. The Logical function in Access begins with IIF.   If you subtract the movie rental: (Left([Description],1) from the days rented DateDiff("d",[DateRented],Now()) and that amount is greater than the days rented, then it's, “Not Overdue.” If the amount is not greater, then it's, “Overdue.”   6. Try it: Create a Logical Expression Click on a blank Field in the QBE Grid. Right click to Zoom. Enter the Expression:   Overdue: IIf(Left([Description],1)-DateDiff("d",[DateRented],Now())>DateDiff("d",[DateRented],Now()),"Not Overdue","Overdue")   Click OK. Keep going.. Query Tools ->Design Exam 77-885: Microsoft Access 2010 4. Creating and Managing Queries 4.3. Manipulate fields: Create a Calculated Control