![]() 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. 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 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. 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 OR searches a broader range of keywords and increases the number of results.Using AND narrows the search and decreases the number of results.The most commonly used Boolean Operators are AND, OR, and NOT. Boolean operators will help you broaden and narrow your searches when when searching library catalogs, databases, and the web. The term Boolean comes from the name of the man who invented this system, George Boole. 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. Instruction Boolean Searching Boolean logic is a system of showing relationships between sets by using the operators AND, OR, and NOT. Send your suggestions, comments or queries to our. For example: "love not hate" will find the whole phrase 'love not hate'. Boolean Search uses a combination of keywords and the three main Boolean operators ( AND, OR, and NOT) to organize and sift through your searches. If you wish to search for the word 'not' in a phrase (and therefore do not want it to be a Boolean operator) you should type the phrase into the search box and enclose it in double quotes. Boolean queries are used to frame the search query with logical operators, namely AND, OR and NOT. The NOT operator retrieves all items that contain the first term entered but not the second. This is an algebraic concept, but dont let that scare you away. If you wish to search for the word 'or' in a phrase (and therefore do not want it to be a Boolean operator) you should type the phrase into the search box and enclose it in double quotes.įor example: "love or hate" will find the whole phrase 'love or hate'. This retrieves more hits than searching one Boolean logic (named after mathematician George Boole) is a system of logic to designed to yield optimal search results. ![]() The OR operator retrieves all items which contain either or both of A search strategy should build up the controlled vocabulary terms, text words, synonyms and related terms for each. If you wish to search for the word 'and' in a phrase (and therefore do not want it to be a Boolean operator) you should type the phrase into the search box and enclose it in double quotes.įor example "love and hate" will find the whole phrase 'love and hate'. This normally retrieves fewer hits than searching one of the terms on its own. The AND operator retrieves all items which contain both of the terms it separates. When you transfer more than one search term from a browse index to a search box, The Bible in English automatically combines them using the Boolean operator OR. ![]() To execute a Boolean search, enter the required terms separated by the Boolean operators you wish to use. Boolean searching allows you to combine search terms using the three Boolean operators AND, OR and NOT.
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