How to group by relation property b if property a is null - mysql

Question

I have a table containing items, each item belongs to an store, e.g:
id | name | store_id | price
1 | hat | 1 | 110
2 | bag | 1 | 120
3 | coat | 2 | 130
A Store can be canonical or a duplicate. A canonical Store has canonical_id equal to null, and a duplicate Store has canonical_id equal to the ID of the canonical Store, e.g:
id | name | canonical_id
1 | NYC | null
2 | Bronx | 1
I need to group items by their Store to get the total stock value of all items at the store, e.g:
SELECT store_id, SUM(price) as `stock_value` FROM items GROUP BY store_id
This would produce 2 results, Store 1 has a stock_value of 230 and Store 2 has a stock_value of 130.
Because Store 2 is a duplicate of Store 1 the items from Store 2 should be included in the total for Store 1. The goal is for this example to provide a single result of 360.
I think the correct implementation would involve some sort of join which retrieves the Store ID from stores by using IFNULL to get either the canonical_id or id after selecting based on id from the items table, but I'm struggling to implement a solution that works.
Any pointers would be greatly appreciated, thank you.
Edit: my attempt is as follows, it appears to meet my needs, are there any caveats / issues with my approach?
SELECT SUM(price) as `stock_value`, IFNULL(stores.canonical_id, store_id) as `store`
FROM items
JOIN stores on stores.id = items.store_id
GROUP BY store

Answer 1

I just realize you don't wanted to keep the stock_values of the "children" or "related" stores. However the next approach take those into account too:
SELECT
s.*,
(SELECT
SUM(i.price)
FROM
items AS i
INNER JOIN
stores AS s1 ON s1.id = i.store_id
WHERE
s1.cannonical_id = s.id
OR
s.id = i.store_id) AS "stock_value"
FROM
stores AS s
Online example: DB-Fiddle
If you don't want they, you just could filter the previous query using the condition WHERE s.cannonical_id is NULL like this:
SELECT
s.*,
(SELECT
SUM(i.price)
FROM
items AS i
INNER JOIN
stores AS s1 ON s1.id = i.store_id
WHERE
s1.cannonical_id = s.id
OR
s.id = i.store_id) AS "stock_value"
FROM
stores AS s
WHERE
s.cannonical_id is NULL
But, you should note that the query you posted on the updated question will be better in performance than this approach.