Log Message:
-----------
Avoid ambiguity, as per suggestion from Peter Stricker.
Modified Files:
--------------
pgsql-server/doc/src/sgml:
query.sgml (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql-server/doc/src/sgml/query.sgml.diff?r1=1.38&r2=1.39)