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What are boolean operators 1


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  • 1. What are Boolean Operators? Mrs. Mersand December 2007
  • 2.
    • 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
  • 3.
    • No…
    • they aren’t leaning
    • ghosts….
  • 4. And
    • Would everybody wearing Jeans, please stand up # _____
    • Would everybody wearing Sneakers please stand up # _____
    • Would everybody wearing jeans and sneakers please stand up # _____
  • 5. Venn Diagram of AND Jeans Sneakers
  • 6. 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.
  • 7. OR
    • Would everybody wearing jeans please stand up #______
    • Would everybody wearing sneakers please stand up #______
    • Would everybody wearing jeans OR sneakers please stand up #______
  • 8. Venn Diagram of OR Jeans Sneakers
  • 9. 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.
  • 10. 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
  • 11. Venn Diagram for NOT Jeans Sneakers
  • 12. 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.
  • 13. 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
  • 14. ( )
    • 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
  • 15. Order of operators
    • Just as in math, certain operators are done first. The order for Boolean operators is:
      • ( )
      • NEAR
      • NOT
      • AND
      • OR
  • 16. 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
  • 17. 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