select attribute mysql - filter

Question

I have there mysql table:
**product (id,name)**
1 Samsung
2 Toshiba
3 Sony
**attribute (id,name,parentid)**
1 Size 0
2 19" 1
3 17" 1
4 15" 1
5 Color 0
6 White 5
7 Black 5
8 Price 0
9 <$100 8
10 $100-$300 8
11 >$300 8
**attribute2product (id,productid,attributeid)**
1 1 2
2 1 6
3 2 2
4 2 7
5 3 3
6 3 7
7 1 9
8 2 9
9 3 10
And listed them like:
**Size**
-- 19" (2)
-- 17" (1)
-- 15" (0)
**Color**
-- White (1)
-- Black (2)
**Price**
-- <$100 (1)
-- $100-$300 (1)
-- >$300 (1)
Please help me the mysql query to list the attribute name and count the number product that this attribute have. EG: When select Size 19" (attribute.id 2)
**Size**
-- 19"
**Color**
-- White (1)
-- Black (1)
**Price**
-- <$100 (1)
-- $100-$300 (1)
This will query to attribute2product >> select the productid >> next query to select other attribute of that productid and display the attribute name, number of prod that attribute name now have... (Like Magento)
Thanks,

Answer 1

I've modified the query. This should be what you based on your updates:
SELECT attribute.name AS attributename, COUNT(*) AS numofproducts FROM product
INNER JOIN attribute2product ON attribute2product.productid = product.id
INNER JOIN attribute ON attribute.id = attribute2product.attributeid
WHERE product.id IN
(
SELECT p.id FROM product AS p
INNER JOIN attribute2product AS a2p ON a2p.productid = p.id
WHERE a2p.attributeid = 2
)
GROUP BY attribute.id, attribute.name;
Based on your above data I got:
attributename numofproducts
19" 2
White 1
Black 1
<$100 2
For multiple attributes (based a more knowledgeable expert Quassnoi's blog article) :
I've removed product table since it's not needed here
SELECT attribute.name AS attributename, COUNT(*) AS numofproducts
FROM attribute2product
INNER JOIN attribute ON attribute.id = attribute2product.attributeid
WHERE attribute2product.productid IN (
SELECT o.productid
FROM (
SELECT productid
FROM (
SELECT 2 AS att
UNION ALL
SELECT 6 AS att
) v
JOIN attribute2product ON attributeid >= att AND attributeid <= att
) o
GROUP BY o.productid
HAVING COUNT(*) = 2
)
GROUP BY attribute.id, attribute.name
2, 6 refer to 19" and White, respectively. COUNT(*) = 2 is to match 2 attributes. More attributes can be added by appending the following to nested derived table:
UNION ALL
SELECT <attributeid> AS att
As expected the result from the query:
attributename numofproducts
19" 1
White 1
<$100 1