Advanced Search Skills Boolean Search EditRefine Search

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Advanced Search Skills - Boolean Search -
Edit/Refine Search
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Boolean operators/Boolean logic

• Boolean search is invented by George Boole, a
  British mathematician (1815-1864).
• He found Boolean algebra, the basis of modern
  computer arithmetic.
• Boole is regarded as one of the founders of
  computer science field.

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Boolean operators/Boolean logic

• Boolean logic is a system for logical operations.
  
• Refers to the logical relationship among search
  terms.
• Compatible with binary logic used in digital
  computers.
• The conventional basis for searching most
  computerized systems / database

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• The primary operators are
• - AND
• - OR
• - NOT

Join words or concepts to alter the results
obtain when searching database
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Boolean AND

• Linking keywords with AND will find pages which
  contain all of the search terms entered.
• For Example, searching for
• Scotland AND Wales
• The database will only retrieve documents in
  which both terms are found.

Venn Diagram
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Boolean OR

• Using the OR command when searching will retrieve
  documents containing any of the search terms
  entered.
• For example, a search for
• Scotland OR Wales
• The database will produce a list of all
  documents which contain either the "Scotland" or
  "Wales" search term.

OR
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Boolean NOT
NOT

• NOT is used to exclude a particular term from
  your results.
• For example
• Scotland NOT Wales
• The databases will retrieve all of the
  documents containing the word Scotland only. It
  will remove all documents that contain the word
  Wales.

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PubMed
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Infotrac OneFile
Search using AND/OR/NOT
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Search using AND/OR/NOT
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• Exercise