SQL + IF?

<?php
$query = "
			SELECT 
			  SUM((f.price1 * b.quantitysmall) + (f.price2 * b.quantitybig)) as totaalprijs 
			FROM 
			  flowers f 
			INNER JOIN 
			  payments b 
			ON 
			  (f.id = b.flower_id)
			WHERE
			 	b.customer_id = ".$id."
			 AND
			 	b.done = 0
			AND
				b.date = NOW()";
?>

<?php
$query = "
			SELECT 
			  SUM((f.price1 * b.quantitysmall) + (f.price2 * b.quantitybig)) as totaalprijs 
			FROM 
			  flowers f 
			INNER JOIN 
			  payments b 
			ON 
			  (f.id = b.flower_id)
			WHERE
			 	b.customer_id = ".$id."
			 AND
			 	b.done = 0
			AND
				b.date = NOW()";
?>

<?php
	$query = "
			SELECT
			  SUM((IF(f.special == 1, f.price12, f.price1) * b.quantitysmall) + IF(f.special == 1, f.price22, f.price2) * b.quantitybig)) as totaalprijs 
			FROM 
			  flowers f 
			INNER JOIN 
			  payments b 
			ON 
			  (f.id = b.flower_id)
			WHERE
			 	b.customer_id = ".$id."
			 AND
			 	b.done = 0
			AND
				b.date = NOW()";
?>

<?php
	$query = "
			SELECT
			  SUM((IF(f.special == 1, f.price12, f.price1) * b.quantitysmall) + IF(f.special == 1, f.price22, f.price2) * b.quantitybig)) as totaalprijs 
			FROM 
			  flowers f 
			INNER JOIN 
			  payments b 
			ON 
			  (f.id = b.flower_id)
			WHERE
			 	b.customer_id = ".$id."
			 AND
			 	b.done = 0
			AND
				b.date = NOW()";
?>