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The text search engine allows queries to be formed from arbitrary Boolean
expressions containing the keywords AND, OR, and NOT, and grouped with
parentheses. For example:
- information retrieval
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finds documents containing 'information' or 'retrieval'
- information or retrieval
-
same as above
- information and retrieval
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finds documents containing both 'information' and 'retrieval'
- information not retrieval
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finds documents containing 'information' but not 'retrieval'
- (information not retrieval) and WAIS
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finds documents containing 'WAIS', plus 'information' but not
'retrieval'
- web*
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finds documents containing words starting with 'web'
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