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You can use Boolean logic when you are searching a database for journal articles. Boolean "operators" (AND, OR and NOT) define the relationships between the terms you enter in the search bar(s).
AND | OR | NOT |
Each result contains all search terms. | Each result contains at least one search term. | Results do not contain the specified terms. |
The search heart and lung finds items that contain both heart and lung. | The search heart or lung finds items that contain either heart or items that contain lung. | The search heart not lung finds items that contain heart but do not contain lung. |