Unknown column 'c' in 'order clause'<br>SELECT i.PKimprenta, i.imprenta, l.localidad  FROM imprentas i INNER JOIN localidades l ON i.FKlocalidad = l.PKlocalidad WHERE 1  and (i.imprenta like '%u%' or l.localidad like '%u%') 
		group by  i.PKimprenta
		order by  c limit 0,16