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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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