Get results from last WHERE condition - mysql

Question

I have the following DB design.
PRODUCTS
+----+----------------------------------+
| id | name |
+----+----------------------------------+
| 1 | Product 1, Intel, Celeron, N3350 |
| 2 | Product 2, Intel, Celeron, N3350 |
| 3 | Product 3, Intel, i5, 8250U |
| 4 | Product 4, Intel, i9, 8950HK |
| 5 | Product 5, Intel, i9, 8950HK |
+----+----------------------------------+
ATTRIBUTES
+----+--------------+
| id | name |
+----+--------------+
| 11 | Manufacturer |
| 22 | Type |
| 33 | Model |
+----+--------------+
ATTRIBUTE_VALUES
+-----+---------+
| id | value |
+-----+---------+
| 111 | Intel |
| 222 | Celeron |
| 333 | i5 |
| 444 | i9 |
| 555 | N3350 |
| 666 | 8250U |
| 777 | 8950HK |
+-----+---------+
And finally, the table that links all of these:
PRODUCT_ATTRIBUTES_VALUES
+------------+--------------+--------------------+
| product_id | attribute_id | attribute_value_id |
+------------+--------------+--------------------+
| 1 | 11 | 111 |
| 1 | 22 | 222 |
| 1 | 33 | 555 |
| 2 | 11 | 111 |
| 2 | 22 | 222 |
| 2 | 33 | 555 |
| 3 | 11 | 111 |
| 3 | 22 | 333 |
| 3 | 33 | 666 |
| 4 | 11 | 111 |
| 4 | 22 | 444 |
| 4 | 33 | 777 |
| 5 | 11 | 111 |
| 5 | 22 | 444 |
| 5 | 33 | 777 |
+------------+--------------+--------------------+
All of these are about filter products.
I want to return the results for each attribute filter.
If I filter by:
Attribute 'Intel' => it should return all 5 results.
Type 'Celeron' => it should return 2 results (only Celeron)
SQL-FIDDLE
SELECT products.id, products.name FROM `products` LEFT JOIN
`product_attributes_values` ON
`product_attributes_values`.`product_id`=`products`.`id` LEFT JOIN
`attributes` ON
`attributes`.`id`=`product_attributes_values`.`attribute_id` LEFT JOIN
`attribute_values` ON
`attribute_values`.`id`=`product_attributes_values`.`attribute_value_id`
WHERE ((attributes.id = 11 AND `attribute_values`.`id` IN (111)) OR
(`attributes`.`id` = 22 AND `attribute_values`.`id` IN (222)) ) GROUP
BY `products`.`id` LIMIT 10

Answer 1

try this one
SELECT
products.id,
products.name
FROM
`products`
LEFT JOIN `product_attributes_values`
ON `product_attributes_values`.`product_id`=`products`.`id`
LEFT JOIN `attributes`
ON `attributes`.`id`=`product_attributes_values`.`attribute_id`
LEFT JOIN `attribute_values`
ON `attribute_values`.`id`=`product_attributes_values`.`attribute_value_id`
WHERE
attributes.id = 11
OR attributes.id = 22
GROUP BY
products.id,
products.name
HAVING
MAX(CASE WHEN attributes.id = 11 THEN attribute_values.id ELSE NULL END) IN (111)
AND MAX(CASE WHEN attributes.id = 22 THEN attribute_values.id ELSE NULL END) IN (222)
LIMIT
10
if you know all your ids, then you don’t need all these joins
SELECT
p.id,
p.name
FROM
`products` as p
LEFT JOIN `product_attributes_values` as pav1
ON p.id = pav1.product_id
and pav1.attribute_id = 11
LEFT JOIN `product_attributes_values` as pav2
ON p.id = pav2.product_id
and pav2.attribute_id = 22
WHERE
pav1.attribute_value_id = 111
AND pav2.attribute_value_id = 222

Answer 2

It is kind of a relational division problem, here is one solution:
SELECT products.id, products.name
FROM products
WHERE EXISTS (
SELECT 1
FROM product_attributes_values
INNER JOIN attributes ON product_attributes_values.attribute_id = attributes.id
INNER JOIN attribute_values ON product_attributes_values.attribute_value_id = attribute_values.id
WHERE product_attributes_values.product_id = products.id AND (
(attributes.attribute_name = 'Manufacturer' AND attribute_values.value = 'Intel®') OR
(attributes.attribute_name = 'Type' AND attribute_values.value = 'Celeron®')
)
HAVING COUNT(*) = 2 -- this must match the number of conditions
)