How to optimize this nested SQL query - mysql

Question

Here is the database schema:
[redacted]
I'll describe what I'm doing with the query below:
Innermost query: Select all the saleIds satisfying the WHERE conditions
Middle query: Select all the productIds that were a part of the saleId
Outermost query: SUM the products.cost and select the vendors.name.
And here is the SQL query I came up with:
SELECT vendors.name AS Company
, SUM(products.cost) AS Revenue
FROM
products
INNER JOIN sold_products
ON (products.productId = sold_products.productId)
INNER JOIN vendors
ON (products.vendorId = vendors.vendorId)
WHERE sold_products.productId IN (
SELECT sold_products.productId
FROM
sold_products
WHERE sold_products.saleId IN (
SELECT sales.saleId
FROM
markets
INNER JOIN vendors
ON (markets.vendorId = vendors.vendorId)
INNER JOIN sales_campaign
ON (sales_campaign.marketId = markets.marketId)
INNER JOIN packet_headers
ON (sales_campaign.packetHeaderId = packet_headers.packetHeaderId)
INNER JOIN packet_details
ON (packet_details.packetHeaderId = packet_headers.packetHeaderId)
INNER JOIN sales
ON (sales.packetDetailsId = packet_details.packetDetailsId)
WHERE vendors.customerId=60
)
)
GROUP BY Company
ORDER BY Revenue DESC;
Any help in optimizing this?

Answer 1

Since you are just using inner joins you normally simplify the query to smth like this:
SELECT ve.name AS Company
, SUM(pr.cost) AS Revenue
FROM products pr
, sold_products sp
, vendors ve
, markets ma
, sales_campaign sc
, packet_headers ph
, packet_details pd
, sales sa
Where pr.productId = sp.productId
And pr.vendorId = ve.vendorId
And ve.vendorId = ma.vendorId
And sc.marketId = ma.marketId
And sc.packetHeaderId = ph.packetHeaderId
And pd.packetHeaderId = ph.packetHeaderId)
And sa.packetDetailsId = pd.packetDetailsId
And ve.customerId = 60
GROUP BY ve.Company
ORDER BY pr.Revenue DESC;
Please try if this works and if it is faster and let me know.