diff options
Diffstat (limited to 'doc/src/sgml/textsearch.sgml')
| -rw-r--r-- | doc/src/sgml/textsearch.sgml | 19 |
1 files changed, 17 insertions, 2 deletions
diff --git a/doc/src/sgml/textsearch.sgml b/doc/src/sgml/textsearch.sgml index caa8847ef8e..41db566b6cc 100644 --- a/doc/src/sgml/textsearch.sgml +++ b/doc/src/sgml/textsearch.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/textsearch.sgml,v 1.43 2008/04/14 17:05:32 tgl Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/textsearch.sgml,v 1.44 2008/05/16 16:31:01 tgl Exp $ --> <chapter id="textsearch"> <title id="textsearch-title">Full Text Search</title> @@ -754,6 +754,20 @@ SELECT to_tsquery('english', 'Fat | Rats:AB'); 'fat' | 'rat':AB </programlisting> + Also, <literal>*</> can be attached to a lexeme to specify prefix matching: + +<programlisting> +SELECT to_tsquery('supern:*A & star:A*B'); + to_tsquery +-------------------------- + 'supern':*A & 'star':*AB +</programlisting> + + Such a lexeme will match any word in a <type>tsvector</> that begins + with the given string. + </para> + + <para> <function>to_tsquery</function> can also accept single-quoted phrases. This is primarily useful when the configuration includes a thesaurus dictionary that may trigger on such phrases. @@ -798,7 +812,8 @@ SELECT to_tsquery('''supernovae stars'' & !crab'); </programlisting> Note that <function>plainto_tsquery</> cannot - recognize either Boolean operators or weight labels in its input: + recognize Boolean operators, weight labels, or prefix-match labels + in its input: <programlisting> SELECT plainto_tsquery('english', 'The Fat & Rats:C'); |