KO: 
	SELECT ricetta, ing_principale
	FROM ricetta
		INNEr JOIN tipo_piatto ON tipo_piatto.id = ricetta.tipo_piatto
	WHERE 1
	
	
	AND data_approvazione IS NOT NULL
	GROUP BY ricetta.id
	ORDER BY ricetta
	LIMIT 0.php;, 30

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '0.php;, 30' at line 10