BOOLEAN (and, or, not) & MATH SYMBOLS
BOOLEAN Searches with Diagrams
The power of Boolean searching is based on combinations of keywords with connecting terms called operators.
The three basic operators are the terms
The operator AND narrows a search by combining terms and retrieves every document that contains both of the words specified. When the computer searches its database and retrieves every record containing both of the words Internet and security, only the records WITH BOTH WORDS will be retrieved.
Internet AND security
AND narrows a search by combining terms
The OR operator broadens or widens a search to include documents containing either keyword. The OR search is particularly useful when there are several common synonyms for a concept or variant spellings of a word.
weightlifting OR bodybuilding
OR searches often produce large numbers of documents
the computer searches for all documents containing these terms
Combining search terms with the NOT operator narrows a search by excluding unwanted terms.
gambling NOT lottery
Boolean search terms may be combined in various ways to refine searches.
oceans OR lakes AND pollution
nurses AND malpractice NOT doctors
children NOT infants AND psychology
This guide was created by Denise English, Director of Library Services. http://www.lscc.fl.us/library/guides/boolsea.htm
MATH & “ ” Searches
You may use + or – as well as “ ” marks to search for an exact word or phrase. example:
Oglala + Horse will make your search more specific. Oglala – Rosebud will decrease some of the general sources that might include both tribes.
Quotation marks will look for the exact title or phrase you are request:
“tribal college library” will produce 1,310 hits on Google whereas
tribal college library entered without the quotation marks brought up more than 176,000 hits on Google.
Check out the InfoPeople SEARCH TOOLS CHART for more tips on Boolean, + or -, and “”, AVAILABLE IN YOUR LIBRARY HANDBOOK.