When using a wildcard in a query criteria, a user should substitute a(n) ________ for the missing unknown character(s)

Use the Not NULL property to indicate that a field value is required.

a. true b. false

If you want to select the first and third rows in the table in the accompanying figure, you select the first row, and then hold down the ____ key while selecting the third row.

A. CTRL B. ALT C. SHIFT D. ENTER