Clarify that NATURAL without matching columns is like CROSS JOIN.

As suggested by Grzegorz Szpetkowski.
15 years ago · 26e7eec5f0
parent f2328b0713
commit 26e7eec5f0
1 changed files with 3 additions and 1 deletions
--- 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>