MYSQL: Select entries in relation to multiple rows of multiple table - mysql

Question

I have three tables that I can't change the structure of:
facet
id name
-----------------
1 Series
2 Material
value
id facet_id name
----------------------------------
1 2 Glass
2 2 Metal
3 1 Series #1
4 1 Series #2
5 1 Series #3
product_facet_values
product_id value_id
-----------------------------------
1 1
1 3
2 1
2 4
3 2
3 5
4 1
I am trying to write two queries:
/1. One that will return the ids that represent the series facet from the values table where a product record is Glass and has any series. So an output like this:
id facet_id name
----------------------------------
3 1 Series #1
4 1 Series #2
Record 1 is not a series.
Record 2 is not a series.
Record 3 is returned because product #1 has both a series and material and the material is glass.
Record 4 is returned because product #2 has both a series and material and the material is glass.
Record 5 is not returned because product #3 has the material of metal even though it has both a series and material.
/2. Same as number one but return a list of product ids.
product_id
---------------
1
2
Product #1 is returned because it has both a series and material and the material is glass.
Product #2 is returned because it has both a series and material and the material is glass.
Product #3 is not returned because it has the material of metal even though it has both a series and material set.
Product #4 is not returned because it has no series set even though the material is glass.

Answer 1

FIRST QUERY:
try this.. I believe this will do the trick.
SELECT
v.id
FROM value v
JOIN product_facet_values pfv ON pfv.value_id = v.id
WHERE pfv.product_id IN
( SELECT
product_id
FROM product_facet_values
WHERE
product_id IN
( SELECT
product_id
FROM product_facet_values
GROUP BY product_id
HAVING COUNT(*) > 1
)
AND value_id = 1
)
AND v.facet_id = 1;
SECOND QUERY:
the inner part of the same query returns the products that have a value of 1 and a value of something other than one so it would be this
SELECT
product_id
FROM product_facet_values
WHERE
product_id IN
( SELECT
product_id
FROM product_facet_values
GROUP BY product_id
HAVING COUNT(*) > 1
)
AND value_id = 1
EXPLANATION:
INNERMOST SUBQUERY:
SELECT
product_id
FROM product_facet_values
GROUP BY product_id
HAVING COUNT(*) > 1
give me products that have more than one record per product (later to be filtered by 'Glass' and 'Series')
MIDDLE SUBQUERY:
SELECT
product_id
FROM product_facet_values
WHERE
product_id IN
(
INNERMOST SUBQUERY
)
AND value_id = 1
give me products that have the value_id = 1 (aka 'Glass') that have more than one record.
OUTERMOST QUERY:
SELECT
v.id
FROM value v
JOIN product_facet_values pfv ON pfv.value_id = v.id
WHERE pfv.product_id IN
(
MIDDLE SUBQUERY
)
AND v.facet_id = 1;
give me the value id for the products that are related to 'Glass' but whos facet_id = 1 (aka series)