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comma-separated list of column names, which the joined tables
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must have in common, and forms a join condition specifying
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equality of each of these pairs of columns. Furthermore, the
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other columns from each table. Thus, <literal>USING (a, b,
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c)</literal> is equivalent to <literal>ON (t1.a = t2.a AND
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t1.b = t2.b AND t1.c = t2.c)</literal> with the exception that
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if <literal>ON</> is used there will be two columns
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<literal>a</>, <literal>b</>, and <literal>c</> in the result,