Hi guys, just a general question about shares, I saw it happen...

Hi guys, just a general question about shares, I saw it happen with gda today so I thought I would ask the question here.

Someone with an order of 50000 shares had 1 share go through, now what would happen if his buy order was good for only a day and pulled at the end of trading, and his other 49999 didn't go through, does it mean he has just paid the $30 or so brokerage fee for 1 share.

I guess it could happen the other way as well, selling, maybe you only get to sell 1 share before the end of the day.

Thanks
Tony