If you don't put in the parentheses, the search statement is processed strictly from left to right, so that the AND is done first. This search strategy will retrieve records containing both of the concepts, Diet Therapy + Bulimia, or any records with the concept Anorexia. For example, diet therapy AND ( bulimia OR anorexia ) will retrieve records containing the two concepts, Bulimia + Diet Therapy, or the two concepts, Anorexia + Diet Therapy, or records that contain all three concepts, Bulimia + Diet Therapy + Anorexia. Searches within parentheses are performed first and operations proceed from left to right. The order in which the operations (AND, OR, NOT) are processed can vary between systems. Use parentheses ( ) to separate keywords when you are using more than one operator and three or more keywords. Nesting, or mixing the Boolean operators, is a way to combine several search statements into one comprehensive search statement. For example, you could search multi-infarct dementia by using Dementia NOT Alzheimer's.īut be careful using this because you would eliminate records discussing both types of dementia, as all articles discussing Alzheimer's are eliminated.
#A BOOLEAN SEARCH SOFTWARE#
Below is a list of commonly used terms: Example: I am looking for Software Engineer candidates. The final Boolean operator NOT allows you to exclude concepts not relevant to your search. Boolean Operators: Boolean operators are simple words (AND,OR, NOT, or AND NOT) used as conjunctions to combine or exclude keywords in a search, resulting in more focused and productive results. The more concepts or keywords you OR together, the more records you will retrieve. For example, kidney disease OR renal diseases will retrieve citations using either (or both) terms. This expands your search by retrieving citations in which either or both terms appear. While most searches are done by entering a keyword and waiting for the result (in Google, YouTube, social listening tools, etc.), Boolean search allows entering keywords combined with Boolean operators such as AND, NOT, AND NOT, etc.
#A BOOLEAN SEARCH MANUAL#
The Boolean operator OR allows you to broaden a concept and include synonyms. Boolean search is a manual type of search (as opposed to a wizard) used in search engines. The more concepts you AND together, the fewer records you will retrieve.
For example: "Does taking aspirin cause Reye's Syndrome in children?" This will retrieve citations that discuss all three concepts in each article.
When terms/concepts are combined with the AND operator, retrieved records must contain all the terms. (The shading represents the outcome of the Boolean operation.) The circle diagrams that help illustrate the relationships between the sets used in Boolean logic were named after another mathematician, John Venn.
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