Boolean Logic: how to talk to search engines in their own language
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George Boole, a famous mathematician, invented Boolean logic which uses AND and OR operators to combine search terms. Boolean logic allows search engines to understand what information a user is looking for. AND produces results that include all search terms while OR produces results that include any of the search terms. Using Boolean operators such as AND and OR allows users to more precisely define their search queries to find relevant information.
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Boolean Logic: how to talk to search engines in their own language
- 1. Booleanand what it can do for you!
- 2. George Boole •He is a rock star •He did math like Michael did “Thriller” •He invented Boolean Logic This is
- 3. BOOLEAN LOGIC is a system that combines terms using AND and OR. Boolean lets you tell a search engine what you want to know!
- 4. How you think How a search engine thinks George Boole, a famous mathematician, wa s also a great animal lover. Do you think he had any pets?
- 5. If the search engine were a person, this would be an easy problem – it just speaks a different language! How a search engine thinks
- 6. Boolean is how you translate between your English and the search engine’s super-logical computer language! Luckily, you only need to know two easy words.
- 7. AND Produces only results that include all keywords and conditions.
- 8. EVERYTHING ABOUT CATS THIS is everything on the entire Internet that includes the word CATS.
- 9. EVERYTHING ABOUT BOOLE THIS is everything on the entire Internet that mentions the word BOOLE.
- 10. EVERYTHING ABOUT CATS EVERYTHING ABOUT BOOLE Here they are together. Everything CATS and everything BOOLE. Notice the rather sizeable overlap. Sometimes CATS and BOOLE occur together. HMMMMM.
- 11. ONLY stuff about CATS AND BOOLE EVERYTHING ABOUT CATS EVERYTHING ABOUT BOOLE We know that information about Boole’s pet cats must include both the word “Boole” and the word “cats.” Therefore, the information we want must be located somewhere in that overlap!
- 12. ONLY stuff about CATS AND BOOLE By using AND, we have told the search engine to eliminate any results that do not include BOTH keywords. Now we have a good chance of finding the information we want!
- 13. OR Produces results that include every keyword and condition.
- 14. EVERYTHING ABOUT CATS Here we have everything about CATS again.
- 15. EVERYTHING ABOUT DOGS And what do you know– here’s everything about DOGS!
- 16. EVERYTHING ABOUT CATS EVERYTHING ABOUT DOGS Here they are together. We don’t want to eliminate either one of these words. We want to know about all the cats as well as all the dogs. HMMMMM!
- 17. EVERYTHING ABOUT CATS EVERYTHING ABOUT DOGS When we ask for CATS OR DOGS, the search engine knows that we want every result that includes EITHER or BOTH keywords. Now our results include not only CATS, but also DOGS!
- 18. COMBO!
- 19. EVERYTHING ABOUT CATS Here we have – again! – everything about CATS.
- 20. EVERYTHING ABOUT CATS EVERYTHING ABOUT DOGS And now, everything about CATS as well as everything about DOGS.
- 21. EVERYTHING ABOUT CATS EVERYTHING ABOUT DOGS We know that by using OR, we can include everything about all the keywords.
- 22. EVERYTHING ABOUT CATS EVERYTHING ABOUT DOGS EVERYTHING ABOUT BOOLE What we’re looking for now is information on George Boole’s cats and dogs – in other words, BOOLE AND anything about his CATS OR his DOGS.
- 23. EVERYTHING ABOUT CATS EVERYTHING ABOUT DOGS EVERYTHING ABOUT BOOLE That information will be in the overlap, just like before! Except now, we’re using TWO operators – AND and OR!
- 24. This is how we can tell the search engine to give us only results that include the word “BOOLE” at the same time as either the word “CATS” or the word “DOGS.” Now we’re SURE to find what we’re looking for! BOOLE AND (CATS OR DOGS)
- 25. Where is Boolean used? • Google! – Google already puts AND between all of your search terms, but sometimes you may want to use OR instead – Using OR can supercharge your Goo-fu! – Try the example! • Boole (cats OR dogs) • Any database – Databases usually give you drop-down AND/OR menus – Even easier than the Goo – Access them for free through your public library, school or college
- 26. Boxford’s Databases Remember, you’ll need your card to log in! Academic One-File Lots of good stuff in one neat place Gale Virtual Reference Library Good for quick answers EBSCOhost A bunch of databases, all useful HeritageQuest Great for looking up your ancestors http://boxfordlibrary.org/index.php/databases
- 27. CONGRATULATIONS! Now go out and find that stuff!