SELECT p.PIN, cm.ProductCode, p.Name, p.Cost, vpw.Cost AS Stock_Price, ROUND((p.Cost/vpw.Cost)-1,2) AS Percentage_Change, vpw.stock 
FROM products.pins p
JOIN products.client_map cm ON p.PIN = cm.PIN
JOIN products._VPW vpw ON p.PIN = vpw.MFG_SKU
WHERE p.Cost <> vpw.Cost 
AND vpw.Stock > 0
-- AND vpw.Cost != 0
Order BY Percentage_Change DESC