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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
- finds documents containing
'information' or 'retrieval'
- information or retrieval
- same as above
- information and retrieval
- finds documents containing both
'information' and 'retrieval'
- information not retrieval
- finds documents containing
'information' but not 'retrieval'
- (information not retrieval)
and WAIS
- finds documents containing 'WAIS',
plus 'information' but not 'retrieval'
- web*
- finds documents containing words
starting with 'web'
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