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What are Boolean Operators?. Mrs. Mersand December 2007. Boolean operators are named after George Boole, an Englishman, who invented them as part of a system of logic in the mid-1800's. The most common Boolean operators are AND, OR, NOT and NEAR, additionally, () can be used

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what are boolean operators

What are Boolean Operators?

Mrs. Mersand

December 2007

slide2
Boolean operators are named after George Boole, an Englishman, who invented them as part of a system of logic in the mid-1800's.
    • The most common Boolean operators are AND, OR, NOT and NEAR, additionally, () can be used
    • They are used to combine search terms when doing research
    • In math, they are used to connect logical statements
slide3
No…

they aren’t leaning

ghosts….

slide4
And
  • Would everybody wearing Jeans, please stand up # _____
  • Would everybody wearing Sneakers please stand up # _____
  • Would everybody wearing jeans and sneakers please stand up # _____
venn diagram of and
Venn Diagram of AND

Jeans

Sneakers

and explained
AND Explained
  • Using the operator AND between keywords will limit the results of a search because all the keywords have to be present in order for an item to be retrieved.
slide7
OR
  • Would everybody wearing jeans please stand up #______
  • Would everybody wearing sneakers please stand up #______
  • Would everybody wearing jeans OR sneakers please stand up #______
venn diagram of or
Venn Diagram of OR

Jeans

Sneakers

or explained
OR Explained
  • Using the OR operator results in either or both of your search terms appearing in your results.
  • Using the OR operator will result in a larger number of retrieved items and therefore expands the search.
slide10
NOT
  • The NOT (or AND NOT) operator forbids the word after it from appearing in the items resulting from your search.
  • Would everybody wearing Jeans but NOT sneakers, please stand up
not explained
NOT Explained
  • Not helps to limit your search because it takes out a category of undesirable results.
  • NOT or AND NOT thus narrows or limits a search by excluding the keyword immediately following it.
slide13
NEAR
  • Finds the terms within 10 words of each other
  • Domestic NEAR Violence
    • would make sure these two words appeared close enough to each other that they would be referring to domestic violence
slide14
( )
  • Used to group together words or phrases, for example

(domestic NEAR violence) and (police AND trial)

    • Brings could be used to search for domestic violence that has been interrupted by the police or gone to trial
order of operators
Order of operators
  • Just as in math, certain operators are done first. The order for Boolean operators is:
    • ( )
    • NEAR
    • NOT
    • AND
    • OR
be sure to use proper search structure
Be sure to use proper search structure
  • What would the following search bring up?

Dogs AND ((rabies OR rabid) NOT (domestic OR Pet) )

    • The search will look for the words rabies and rabid
    • Then domestic and pet
    • Then remove all results that contain the words domestic or pet from the results
    • Then remove anything that does not contain the word dog from the results
now lets try some on our own
Now lets try some on our own
  • You should always use more than one search engine when you are doing research
  • Try thinking out of the box, give Google a break!!
  • Other options
  • www.mama.com
  • www.dogpile.com
  • www.yahoo.com
  • www.surfwax.com
  • www.ixquick.com
  • infomine.ucr.edu
  • www.lii.org
  • www.ipl.org
  • www.nettrekker.com
  • www.altavista.com