Q12) The following query is executing very slowly on a large amount of data, Would an Index help to speed it up? It not why not? If so, which columns should be indexed and why would this help? SELECT productNane, price quantity As 'total' FROM Product INNER JOIN Pricehistory ph on p.productId ph.productId WHERE ph.date End - NULL AND p.product Type IN (2435, 2233, 1286, 42) (10 marks)