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Adjust example to reduce confusion between a tsvector column and

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an index, per Simon.
This commit is contained in:
Tom Lane 2007-11-14 23:48:55 +00:00
parent 866bad9543
commit a1715ac8f7
1 changed files with 5 additions and 5 deletions
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10
doc/src/sgml/textsearch.sgml
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@ -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 &amp; table') @@ textsearch_index
WHERE textsearchable_index_col @@ to_tsquery('create &amp; table')
ORDER BY last_mod_date DESC LIMIT 10;
</programlisting>
</para>