From 6b02ed66e2856abb1d5eef64747badd4fc78cef9 Mon Sep 17 00:00:00 2001
From: Robert Haas <rhaas@postgresql.org>
Date: Mon, 13 Jun 2011 12:59:04 -0400
Subject: [PATCH] Clarify that NATURAL without matching columns is like CROSS
 JOIN.

As suggested by Grzegorz Szpetkowski.
---
 doc/src/sgml/queries.sgml | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/doc/src/sgml/queries.sgml b/doc/src/sgml/queries.sgml
index b3cf39a39b..7ca640e697 100644
--- a/doc/src/sgml/queries.sgml
+++ b/doc/src/sgml/queries.sgml
@@ -266,7 +266,9 @@ FROM <replaceable>table_reference</replaceable> <optional>, <replaceable>table_r
         <literal>USING</>: it forms a <literal>USING</> list
         consisting of all column names that appear in both
         input tables.  As with <literal>USING</>, these columns appear
-        only once in the output table.
+        only once in the output table.  If there are no common
+        columns, <literal>NATURAL</literal> behaves like
+        <literal>CROSS JOIN</literal>.
        </para>
 
        <para>
-- 
2.40.0