Boolean operators can be combined in a technique called Nesting to create focused searches in a database. Nesting involves using parentheses to join strings of search terms in combination with Boolean operators. Parentheses tell the database to do all searches in parentheses first followed by the operator that connects the two parenthetical searches. The search (school OR campus) AND (adolescent OR teenager) is an example of a nested search. The Boolean operators are highlighted in yellow.
The shaded areas represent the items that would be returned in this nested search.
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