Sample Question #3“I want to find information about mummies, but not mummies in Egypt.”Suggested search:mummies NOT Egypt Sample Question #2“I want to find information about either Brad Pitt or his wife, Angelina Jolie.”Suggested search:“Brad Pitt” OR “Angelina Jolie” Here are two possibilities:Cloning AND human“human cloning” ( )Sample Question #1“I want to find information about cloning humans.”To find information on this topic, you might try a couple of different search strings. So combining them in ( ) with OR helps us find more info.How do I know which Boolean Operators to use?AND Salmonella and food poisoning are two related terms.
Your search is narrowed by using NOT, and you exclude more by using OR.Example #2 Using ( )“peanut butter” and (salmonella OR “food poisoning”)Using this search string allows you to find anything about peanut butter as it relates to salmonella or food poisoning. Using ( ) allows you to combine two possible searches into one, and it saves you time.Example #1 Using ( )“alternative energy” NOT (wind OR solar)Using this search string would allow you to find documents about alternative energy, but not wind or solar methods – it would only give you other methods. Use AND and OR together to expand your search. Use NOT and OR together to limit your search. (Parentheses)(Parentheses) allow you to combine any of the Boolean operators together in combination. “Henry Miller”Note:Using “quotation marks” will give you different search results than if you use the AND operator between each word without quotes. Helpful for searching multiple-word terms, places, or a person’s name.Example using “ ”:“global warming” It requires words to be searched as a phrase in the exact order that you type them within the quotation marks. (Parentheses)“Quotation Marks”Using quotation marks narrows your search. Purple shaded area represents search results.CatsDogsĪdvanced Boolean Search Techniques“Quotation Marks” Use NOT to exclude a term from your search and to find fewer results.Example using NOT:Cats NOT DogsDocuments are retrieved containing only information on cats, and nothing on dogs. It retrieves documents that do not contain a search term in your search. Gold shaded area represents search results.Collegeuniversity Use it to search for similar terms.Example using OR:College OR UniversityDocuments are retrieved containing either search term. The more terms you connect with OR, the more search results you will find. It retrieves documents that contain either of the search terms or keywords that you specify, but not necessarily both. The more terms you connect with AND, the fewer search results you will find.Example using AND:Poverty AND CrimeDocuments are retrieved containing both search terms.īlue shaded area represents search results.povertycrime It retrieves documents that contain both of the search terms or keywords that you specify. Most online databases and Internet search engines support Boolean searches.Īllows you to do effective searches by cutting out many unrelated documents.Basic Boolean Operators:AND
What is Boolean searching?Based on a method of logic developed by George Boole, a 19th century English mathematician. Boolean SearchingImprove your database and internet searching with Boolean operatorsCarteret Community College Librar圜ontent by Tara Guthrie
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