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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2007-11-14 23:48:55 +0000 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2007-11-14 23:48:55 +0000 |
| commit | a1715ac8f77cce628a69c434764dbd24e52bc875 (patch) | |
| tree | cb8edc58c4187fbcfed73ec4b8675f17730bdfb5 | |
| parent | 866bad9543897291319d0a309dbddeb9ea8808ac (diff) | |
| download | postgresql-a1715ac8f77cce628a69c434764dbd24e52bc875.tar.gz postgresql-a1715ac8f77cce628a69c434764dbd24e52bc875.zip | |
Adjust example to reduce confusion between a tsvector column and
an index, per Simon.
| -rw-r--r-- | doc/src/sgml/textsearch.sgml | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/doc/src/sgml/textsearch.sgml b/doc/src/sgml/textsearch.sgml index 9366fdd2407..0a153c465cd 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 1.34 2007/11/14 23:43:27 tgl Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/textsearch.sgml,v 1.35 2007/11/14 23:48:55 tgl Exp $ --> <chapter id="textsearch"> <title id="textsearch-title">Full Text Search</title> @@ -538,15 +538,15 @@ CREATE INDEX pgweb_idx ON pgweb USING gin(to_tsvector('english', title || body)) indexed when the other is <literal>NULL</>: <programlisting> -ALTER TABLE pgweb ADD COLUMN textsearch_index tsvector; -UPDATE pgweb SET textsearch_index = +ALTER TABLE pgweb ADD COLUMN textsearchable_index_col tsvector; +UPDATE pgweb SET textsearchable_index_col = to_tsvector('english', coalesce(title,'') || coalesce(body,'')); </programlisting> Then we create a <acronym>GIN</acronym> index to speed up the search: <programlisting> -CREATE INDEX textsearch_idx ON pgweb USING gin(textsearch_index); +CREATE INDEX textsearch_idx ON pgweb USING gin(textsearchable_index_col); </programlisting> Now we are ready to perform a fast full text search: @@ -554,7 +554,7 @@ CREATE INDEX textsearch_idx ON pgweb USING gin(textsearch_index); <programlisting> SELECT title FROM pgweb -WHERE to_tsquery('create & table') @@ textsearch_index +WHERE textsearchable_index_col @@ to_tsquery('create & table') ORDER BY last_mod_date DESC LIMIT 10; </programlisting> </para> |