Hi, I'm trying to get my head around the following question. As an example take a table with products:
productid (pk) name and productprice productpriceid (pk) productid (fk) pricedate price There are multiple records in productprice for each product as prices (often) go up and (less often) go down. I'm looking for a query that returns the following: productid, name, pricedate, current_price, difference current_price is the latest (ie. most recent date) price of the product and difference is the difference in price between the latest price and the price before the latest. Any suggestions how to do this with SQL only? I can make it work with a function (probably less efficient) but think this should be possible with SQL too... cheers, Jan
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