Filtering Within the Database
Boolean operators are based on math and logic.
They connect your search terms to either narrow or broaden your results.
The three main Boolean operators are AND, OR, & NOT.
AND = reduces the number of results
ex: cats AND felines will only pull records that have both "cats" and "felines" mentioned in them.
OR = increases the number of results.
ex: cats OR felines will pull records that have either the word "cats" or the word "felines," which will increase the number of possibilities.
NOT = reduces the number of results
ex: cats NOT felines will pull records only mentioning "cats" and will exclude any record mentioning "felines."
Truncation and wildcard symbols can vary by database.
When searching for phrases, it is helpful to put them in quotations. Doing so tells the database to search for the words in order, instead of placing an imaginary "AND" in between each one. For example:
Subject Headings/Controlled Vocabulary