And / Or / Not
This is an algebraic concept, but don't let that scare you away. Boolean connectors are all about sets. There are three little words that are used as Boolean connectors:
Think of each keyword as having a "set" of results that are connected with it. These sets can be combined to produce a different "set" of results. You can also exclude certain "sets" from your results by using a Boolean connector.
AND is a connector that requires both words to be present in each record in the results. Use AND to narrow your search.
|Television and violence||123 hits|
The words 'television' and 'violence' will both be present in each record.
OR is a connector that allows either word to be present in each record in the results. Use OR to expand your search.
|Adolescents or teenagers||172 hits|
Either 'adolescents' or 'teenagers' (or both) will be present in each record.
NOT is a connector that requires the first word be present in each record in the results, but only if the record does not contain the second word.
|High school||423 hits|
|High school not Elementary||275 hits|
Each record contains the words 'high school', but not the word 'elementary'.
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Boolean Search Examples
A (link will open in a pop-up window) text description of "Boolean Search Examples" is also available.