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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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