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If you enter: | You retrieve: |
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railroad AND subway | only records containing both railroad and subway |
airplane AND airport AND terminal | only records containing all three search terms-- airplane, airport , and terminal |
If you enter: | You retrieve: |
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railroad OR subway | records containing railroad, records containing subway, and records containing both |
airplane OR airport OR terminal | records containing airplane, records containing airport, records containing terminal, and records containing any combination of two or all three search terms |
If you enter: | You retrieve: |
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railroad NOT subway | records containing railroad which do not include the search term subway |
airplane AND airport NOT terminal | records that contain both airplane and airport but do not include any reference to terminal |
Group terms in parentheses to specify the order in which they will be combined. Without parentheses, terms will be combined in left-to-right order. For example, railroad and subway or Amtrak can be combined with parentheses to give you two distinctly different sets of results.
If you enter: | You retrieve: |
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railroad AND subway OR Amtrak | records containing both railraod and subway , then records containing Amtrak whether or not they contain railroad or subway |
(railroad AND subway) OR Amtrak | the same results as above |
railroad AND (subway OR Amtrak) | records containing either subway or Amtrak or both; it then searches that set of records for records that contain railroad so that all records contain either subway and railroad or Amtrak and railroad or subway and Amtrak and railroad |
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