Note that Whale and Pacific must always appear together, or not at all, while Cetacean may be the only term present. The blue area in the second illustration represents the results that would be returned for the search Cetacean OR (Whale AND Pacific), which yields 1718 results and gives us articles with the following combinations: This is because Cetacean and Whale are linked with OR while Pacific is added to the search with AND. Note that Cetacean and Whale may or may not be present, but Pacific will appear in every search result. The blue area in the first illustration represents the results that would be returned for the search (Cetacean OR Whale) AND Pacific, which yields 633 results and gives us articles with the following combinations: Using parentheses in your Boolean search, is a lot like using them in arithmetic - the search inside the parentheses is done first. Take a look at the illustrations below - the search terms and Boolean Operators are identical, but the parentheses create two very different searches. You can use parentheses to build a search with a combination of Boolean Operators.
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#BOOLEAN SEARCH MEANING HOW TO#
#BOOLEAN SEARCH MEANING PDF#
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