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Boolean OperatorĮach search result will contain both the terms falls AND agedĮach search result will contain either (or both) of the terms falls OR agedĮach search result will contain both the terms falls AND aged but only if they do NOT contain the third term homeīoolean logic uses the terms AND, OR and NOT to combine concepts. Boolean search is the process of combining keywords with other words or symbols to narrow the search results. These are logic-based words that help search engines narrow down or broaden search results. These Boolean operators, when used in a Boolean expression, control the. Boolean searches allow you to combine words and phrases using the words AND, OR, NOT (known as Boolean operators) to limit, broaden, or define your search. The most common Boolean operators used are: AND (&), OR () and NOT (). Now test your understanding in the next example by identifying how the results would appear and then clicking on the answer symbol to check your answer. Boolean searching uses operators: words like AND, OR, and NOT. Boolean searching is built on a method of symbolic logic developed by George Boole, a 19th century English mathematician. Boolean OperatorĬombine keywords that reflect different conceptsĮach search result will contain both the terms art and therapyĬombine keywords that reflect similar conceptsĮach search result will contain either (or both) of the terms art or therapyĮach search result will contain both the terms art and therapy but only if they do not contain the third term children Use brackets when using Boolean Operators such as ‘(art AND therapy) NOT children’ so that the database will only look for articles about art and therapy but exclude those that mention children. A Boolean search, in the context of a search engine, is a type of search where you can use special words or symbols to limit, widen, or define your search.

Using NOT excludes information not required and reduces the number of resultsīrackets are used to define the order in which the concepts are processed.

Using the Operators AND The Boolean operator AND tells a search engine that you want to find information about two (or more) search terms. Basic Boolean Operators Explained Boolean Search Operator: AND Boolean Search Operator: OR Boolean Search Operator: NOT Boolean Search Modifier: ASTERISK.

Using OR searches a broader range of keywords and increases the number of results Boolean searching uses operators: words like AND, OR, and NOT.Using AND narrows the search and decreases the number of results.The or operator could also be defined by the following truth table. The most commonly used Boolean Operators are AND, OR, and NOT. Manipulate Boolean values with Boolean operators Convert Booleans to other types.

Combining terms with Boolean Operators (AND, OR, NOT)īoolean Operators are specific words used to combine concepts or keywords to improve the chances of finding relevant information.

Definition boolean search logic