<form action="ajax.php" method="post" onsubmit="return false">
<form>
$(".sub").submit (function(e){
e.preventDefault();
select
usr.*,
recept.*
from
(
select distinct
t2.*
from tovary t1
inner join recepty t2 on t2.product_use_1 = t1.id
or t2.product_use_2 = t1.id
or t2.product_use_3 = t1.id
// и тд до t2.product_use_9
where t1.id = ####
) as recept
inner join
(
select
t1.id,
t1.name,
t2.own_id
from
users t1
inner join comments t2 on t1.id = t2.own_id
) as usr on usr.own_id = recept.own_id