![]() Field Designations MUST be in Square Brackets If you are using the Boolean search screen, you must post qualify each term with a field designation that must be enclosed in square brackets. Some databases only accept these operators when they are capitalized. A search formulation may contain both symbols and words to represent the Boolean operators, e.g., x & y OR z. Psychology NOT Developmental: any results that contain the word "psychology" will appear in your results list except those results that also contain the word "developmental".Ĭapitalize your Boolean commands. Any kind of logic, function, expression, or theory based on the work of George Boole is considered Boolean. Using Boolean command NOT in your search tells the search engine to give you results that contain the word(s) you entered except the word following NOT. Teenagers OR adolescents: any results that contain either teenagers or adolescents will appear in your results list. ![]() Using Boolean command OR in your search tells the search engine to give you results that contain any of the words you have entered. Media AND violence: only those results that contain both media and violence will appear in your search results list. Using the Boolean command AND in your search tells the search engine to give you results that contain all of the words you have entered. A logic gate is a physical piece of hardware that performs an AND, OR, or NOT operation, as well as other Boolean operations. Other commands include parentheses, truncation, and phrases. Logical operators logical gates At the hardware level, computers implement logical operators using logic gates. The most popular Boolean commands are AND, OR, and NOT. Boolean is a set of commands that can be used in almost every search engine, database, or online catalogue.
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