In this example from the Web of Science database, you can use the Basic search form to add multiple search lines by clicking on Add Another Field. When you use the AND operator, you narrow your search results to include only results satisfying both requirements. AND The AND operator combines two or more search criteria into one string. Sometimes you will have to access the Advanced Search for these options. To begin using Boolean search strings to optimize your search for job candidates, read about these five commonly used Boolean operators: 1. Many databases offer the functionality to separate out your search terms, and this saves you having to add the parentheses. OR human as a secondary search - This means that your search results containing human would not be linked in any way to cloning.If you do not use the parentheses and search using the following:Ĭloning AND sheep OR human, your search will be processed as: Words or phrases such as AND, OR, NOT can be used to limit, broaden and determine the search results utilize a search engine to its fullest potential. If you want to find information on cloning humans and cloning sheep, use the following instruction:Ĭloning AND (sheep OR human) - This will search for cloning AND sheep as well as cloning AND human What is Boolean search Boolean search helps you define your search specifically to what you are looking for. Boolean operators act on sets - groups of records conta Boolean Operators: A Cheat Sheet The circle diagrams that help illustrate the relationships between the sets used in Boolean logic were named after another mathematician, John Venn. Any number of boolean search terms can be connected with these operators to refine your search results. The operators used to express the relationship are AND, OR, and NOT. If you use a combination of AND and OR operators in one search, use parentheses (brackets) to group the OR words together so that your search is processed correctly. The Boolean operators, AND, OR, and NOT, help you construct a logical search. In a search query, Boolean logic helps us define the logical relationship between multiple search terms. They typically recognise AND as the primary operator and will connect concepts with AND together first. Databases usually process the Boolean operators in a logical order. When searching electronic databases, you can use Boolean operators to either narrow or broaden your results list.
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