docs: use alias in WHERE clause of full text search example

The current doc query specified an alias in the FROM clause and used in
it the target list, but not in the WHERE clause.

Reported-by: axykon@gmail.com
Discussion: https://postgr.es/m/158316348159.30450.16075357948244298217@wrigleys.postgresql.org

Backpatch-through: 9.5

diff --git a/doc/src/sgml/textsearch.sgml b/doc/src/sgml/textsearch.sgml
index 9839eaa8dd2e9511e0bd476bd41f60d2ed9ab8d8..c5b254c7ca936e5a49e96015d3daa4b4c4381455 100644 (file)
--- a/doc/src/sgml/textsearch.sgml
+++ b/doc/src/sgml/textsearch.sgml
@@ -200,7 +200,7 @@ WHERE mid = 12;
 
 SELECT m.title || ' ' || m.author || ' ' || m.abstract || ' ' || d.body AS document
 FROM messages m, docs d
-WHERE mid = did AND mid = 12;
+WHERE m.mid = d.did AND m.mid = 12;
 </programlisting>
    </para>