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Claiming that NATURAL JOIN is equivalent to CROSS JOIN when there are no common column names is only strictly correct if it's an inner join; you can't say e.g. CROSS LEFT JOIN. Better to explain it as meaning JOIN ON TRUE, instead. Per a suggestion from David Johnston. Discussion: https://postgr.es/m/CAKFQuwb+mYszQhDS9f_dqRrk1=Pe-S6D=XMkAXcDf4ykKPmgKQ@mail.gmail.com