4/10/2023 0 Comments Youtube boolean search![]() ![]() You can also nest parentheses (put one set inside of another) and the the database will work from inside out. Then it looks in those results to find "mosquito control." If you search "mosquito control" AND (bats OR frogs), the database knows that it needs to look up bats OR frogs first.First it looks up "mosquito control" AND bats and then it looks for frogs, so you get search results that are about frogs but have nothing to do with mosquito control If you search "mosquito control" AND bats OR frogs, the database works left to right.That is why you need to put parentheses around groups of keywords joined by OR.Įxample: Searching the use of bats and frogs for mosquito control Parentheses tell the database that it cannot just work from left to right - it has to perform certain operations first. Hint: always put parentheses around groups of keywords joined by OR. With OR, you search rabies AND (bats OR possums OR "feral cats") and the database knows that you need to know about rabies in bats, or rabies in possums, or rabies in feral cats, or any combination of the above. ![]() You would miss out on the results that talked about rabies in only one of those kinds of animals.
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