2. Whenever you conduct a search in a search engine or database, you typically type in whatever youâre interested inâthen the search engine or database gives you the results of your search. This is how Google worksâitâs also how you search for books and articles in library catalogs and library databases. Boolean operators let you better control what sorts of books or articles will appear in your search results. Even more than this, Boolean operators are a helpful way of conceptualizing your search. Once youâve learned how Boolean operators work, your search skills will improve, whether thatâs in a library database or Google.
3. Understanding Boolean Operators and how they work is useful for a couple of different reasons: Boolean operators make it easier to find the books and articles you need. Boolean operators make your searches more exact and thus more powerful. By constructing more specific searches, you narrow in on materials related to your topic much faster.
7. AND âANDâ lets you search for items that include two or more search terms or keywords. Both terms must appear in the article or book in order for that article or book to appear in your search results. Here are a few examples: Jim AND Jill dog AND cat Olympics AND skiing Try visualizing an âANDâ search like this: Searching just âJimâ will give you the first circle of returns. Searching just âJillâ would give you the second circle. But searching âJim AND Jillâ will only give you the shaded portionâie, only the results for where the two search terms overlap. Jill Jim
10. OR âORâ lets you search two or more search terms at once. Unlike âANDâ searches, only one of the search terms need to appear in a book or article in order for that book or article to appear in your search returns. John OR Jim cat OR feline soccer OR football Try visualizing it like this: Searching using âORâ gives you EVERY article or book that includes either of the two search terms (or keywords). This sort of search is great if youâre unsure of which keyword to useâyou can just try both at once! Jim John
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12. Gold shaded area represents search results (itâs all gold).College university
13. NOT âNOTâ lets you exclude books or articles from your search results that you know wonât be useful. Here are a few examples: Bigfoot NOT truck forest NOT (tropical OR rain) Rock NOT geology Try visualizing a âNOTâ search like this: If Iâm interested in rock music and I search ârock,â I may get a lot of search returns that relate to geology, something totally unrelated to rock music. But I can get rid of all those useless geology search returns by searching: rock NOT geology. This means I have a lot fewer search returns to weed through. geology rock
16. Just to be clear, you donât need to capitalize Boolean operators in order for them to work. Theyâre only capitalized in this tutorial for emphasis. Also, the âANDâ is assumed by some search engines and databases, meaning the search engine/database automatically puts an âANDâ in between each word in your search anyway. Letâs look at two final operators, both of which can be very useful.
17. â â Quotation marks are extremely useful. As we mentioned before, search engines and databases may automatically put an âANDâ in between each of the words in your search string. So if you search⌠King of the hill âŚthe database will actually search: king AND of AND the AND hill So how do we only search for books or articles that include the full phrase âKing of the hillâ? We use quotation marks around the phrase: âKing of the hillâ Now only items that use the full phrase will appear in our search results. This is especially helpful with full names. If we searched Henry Miller without quotation marks, every article or book that includes the names Henry and Miller will show up in our returns. By putting âHenry Millerâ in quotation marks, we weed out the useless stuff.
18. * The asterisk is also called a wildcard. Itâs also called a truncation mark. This is an extremely useful Boolean operator, and itâs well worth learning how it works. Basically, it acts as a substitute for any conceivable combination of letters. Letâs look at an example: If I was interested in feminism in professional sports, I might try a search like this: feminism AND professional sports. Unfortunately, that search may miss a couple of articles Iâd find really useful. Why? Because âfeminismâ would have to appear in any book or article in my search returns. What if a great article exists in a database, but it uses the word âfeministâ instead of âfeminismâ in the article record? It might not show up in my search returns. Instead, I might search: femin* AND professional sports. The asterisk (*) lets me search every possible ending to âfeminâ all at once. Another example: civil* would pull up âcivilization,â âcivilizing,â âcivil,â and every other word that starts with âcivilâ.
20. Question #1 âI want to find information about cloning humans.â To find information on this topic, you could actually try a couple of different search strings. Here are two possibilities: Cloning AND human âhuman cloningâ
21. Question #2 âI want to find information about either Brad Pitt or his wife, Angelina Jolie.â Suggested search: âBrad Pittâ OR âAngelina Jolieâ
22. Question #3 âI want to find information about mummies, but not mummies in Egypt.â Suggested search: mummies NOT Egypt
23. Question #4 âI want to find information about behavior in cats.â Consider: Is there more than one search term we could use to find cat-related information? Possible search: Behavior AND (cats OR felines)
24. Question #5 âI want information on designing web sites, but not on specific web design software programs.â Consider: which software programs help you create web sites? Possible searches: âweb site designâ NOT (Dreamweaver OR âFront Pageâ) âweb site designâ NOT software
25. Remember: If you ever have questions or need assistance, ask a librarian!