Errore data_elenco SELECT az.*,azap.*,az.id,p.titolo_ita AS paese_titolo_ita,pr.titolo_ita AS paese_prov FROM aziende AS az JOIN aziende_app AS azap ON az.id=azap.id_aziende JOIN paese AS p ON p.id=az.id_paese JOIN province AS pr ON pr.id=p.id_province WHERE az.id= GROUP BY az.id: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'GROUP BY az.id' at line 1