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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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