Boolean Searching

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					      Boolean Searching

http://adam.ac.uk/info/boolean.html#bool
            Boolean Searching
• A simple lesson in Boolean searching is available and advisable to
  those who are unfamiliar with this method.
• It is possible to compose some complex search expressions using
  Boolean logic on this search system. To do so, use the following
  terms:

• 'AND' (Boolean AND)
  'OR' (Boolean OR)
  'AND NOT' (Boolean NOT)
•
  Parentheses can also be used when conducting an advanced
  search.

• For example: art AND (school OR college) - this expresses a search
  for records containing information about art schools or colleges.


                       http://adam.ac.uk/info/boolean.ht
                                   ml#bool
               Simple Boolean
• Boolean logic is essentially very simple. When used in
  constructing a search expression, it can be very useful in
  specifying exactly what information you want.

• The basis of Boolean logic can be illustrated by the
  following diagrams:

• Boolean 'AND'




• This is expressed as 'blue AND yellow' in a search.
                    http://adam.ac.uk/info/boolean.ht
                                ml#bool
               Simple Boolean
• When using AND in this search expression, results
  retrieved will contain both blue and yellow information.
  The results will not include those documents containing
  only blue or only yellow information. In the diagram the
  documents retrieved by using this search expression are
  contained within the green area.
• EXAMPLE: art AND schools
  This will retrieve all records containing both keywords art
  and schools.



                    http://adam.ac.uk/info/boolean.ht
                                ml#bool
                  Simple Boolean
• Boolean 'OR'




• This is expressed as 'blue OR yellow' in a search.

• When using OR in this search expression, results retrieved will
  contain either blue information, or yellow information, or blue and
  yellow information together. Such a search will not merely retrieve
  documents containing only blue information or only yellow
  information. In the diagram the documents retrieved by using this
  search expression are contained within all the colour areas.
• EXAMPLE: ceramics OR pottery
  This will retrieve all records containing the keywords ceramics or
  pottery, as well as those containing both.

                        http://adam.ac.uk/info/boolean.ht
                                    ml#bool
                  Simple Boolean
• Boolean 'NOT'




• This is expressed as 'blue NOT yellow' in a search.

• When using NOT in this search expression, results will contain only
  blue. The NOT operator will exclude yellow completely and thus any
  green information will be excluded also. It is important, therefore, to
  be careful when using this operator in order to avoid hindering your
  search. In this diagram the documents retrieved by using this search
  expression are contained within the blue area.
• EXAMPLE: film NOT photography
  This will retrieve all records containing the keyword film but not the
  keyword photography.

                        http://adam.ac.uk/info/boolean.ht
                                    ml#bool
      Feature                                Search Engine

                         AltaVista Advanced Web Search | AllTheWeb
Boolean operators        Advanced Search |
                         Dogpile | Google [OR only] | Ixquick
Full Boolean logic
with parentheses,     AlltheWeb Advanced Search | AltaVista
e.g.,                 Advanced Web Search |
behavior and (cats or Ixquick | MSN Search
felines)

Implied Boolean +/-      Most search engines offer this option

                         Most advanced search options offer this,
                         including:
Boolean logic            AllTheWeb Advanced Search | AltaVista
using search form        Advanced Web Search AOL Advanced
terminology              Search | Ask.com Advanced Search | Google
                         Advanced Search | MSN Search Search
                         Builder | Yahoo Advanced Web Search
Proximity operators      Exalead | Google [by default] | Ixquick
                      http://www.internettutorials.net/bo
                                  olean.html
          Interactive Tutorial
• http://library.nyu.edu/research/tutorials/boo
  lean/boolean.html

				
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posted:4/19/2011
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