... not to argue with Steve Jimmo's point. In answer to 'how do I make sure that the data in the table is ordered as it is loaded', Steve is 100% right. But to take it a step further, ordering the data in the table does not guarantee that it will always be returned in that order.
So if you are relying on processing the data in a given order at a later date, you must have a 'order by' key. Which incidentally, Steves suggestion also solves nicely.