Identifying keywords or phrases and then connecting them using Boolean operators (AND, OR ... you will only get results that include all three search terms. Using NOT is another way to narrow a search ...

A search for data that meets several criteria by using the Boolean operators AND, OR and NOT (see Boolean logic). For example, the request: "Search for all Spanish and French speaking employees ...

Using Parentheses to Control Order of Evaluation Even though SAS evaluates logical operators in a specific order ... moving outward until all parentheses have been processed. For example, suppose you ...

A prefix operator is an operator that is applied to the variable, constant, function, or parenthetic expression that immediately follows it. The plus sign (+) and minus sign (-) can be used as prefix ...