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Clarify that NATURAL without matching columns is like CROSS JOIN.

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As suggested by Grzegorz Szpetkowski.
This commit is contained in:
Robert Haas
2011-06-13 12:59:04 -04:00
parent f2328b0713
commit 26e7eec5f0
1 changed files with 3 additions and 1 deletions
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doc/src/sgml/queries.sgml
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@@ -266,7 +266,9 @@ FROM <replaceable>table_reference</replaceable> <optional>, <replaceable>table_r
<literal>USING</>: it forms a <literal>USING</> list <literal>USING</>: it forms a <literal>USING</> list
consisting of all column names that appear in both consisting of all column names that appear in both
input tables. As with <literal>USING</>, these columns appear 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>
<para> <para>