How Logical Operators Are Used
QBF allows you to use the logical operators AND (conjunction) and OR (disjunctive) to qualify retrievals. AND and OR are known as Boolean operators:
• When you use the AND operator, QBF retrieves only data records that meet both or all of the criteria you specify.
• When you use the OR operator, QBF retrieves data records that meet any one of the criteria you specify.
There are two ways to use the AND and OR operators:
• Within a column
• Between different columns
For more information on the use of Boolean operators, see the chapter "VIFRED Field Specifications."