Mine

$sql="SELECT domainsponsor_results.domain, domainsponsor_results.stored, domainsponsor_results.visitors as dvisitors, domainsponsor_results.total_revenue as drevenue,
						 google_results.landing as gvisitors, google_results.revenue as grevenue,
						 sedo_results.uniques as svisitors, sedo_results.earnings as srevenue,
						 trafficz_results.clicks as tvisitors, trafficz_results.total as trevenue
						 FROM domainsponsor_results
						 LEFT JOIN google_results USING (stored, domain)
						 LEFT JOIN sedo_results USING (stored, domain)
						 LEFT JOIN trafficz_results USING (stored, domain)";