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Commit6b02ed6

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Clarify that NATURAL without matching columns is like CROSS JOIN.
As suggested by Grzegorz Szpetkowski.
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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
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<literal>USING</>: it forms a <literal>USING</> list
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consisting of all column names that appear in both
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input tables. As with <literal>USING</>, these columns appear
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only once in the output table.
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only once in the output table. If there are no common
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columns, <literal>NATURAL</literal> behaves like
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<literal>CROSS JOIN</literal>.
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</para>
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<para>

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