SELECT DISTINCT
dp.DPStream
, sku.SkuNumber
, sku.Category
, CStr(prod.ProductId)
, CStr(prod.WINProductId)
, prod.WINDescription
FROM (StreamSKUs AS dp INNER JOIN SKUs AS sku ON dp.SkuNumber=sku.SkuNumber) LEFT JOIN CategoryProducts AS prod ON prod.Category=sku.Category
ORDER BY sku.SkuNumber;