If someone bought at a price then someone else sold at the same price. Bitstamp matches buy and sell orders to create trades. Thus each trade consists of a matched buy and sell order (or parts thereof). Thus your trade doesn't tell you if it was a bid or ask because it's a matched pair.
I won't post again because you ask for help yet you won't take it when it's given...
it is different because the sequence, someone first place an order, then someone buy from the order list,it is called a bid. I won't post again because you ask for help yet you won't take it when it's given...