$($USE A for ATHLETE, E for EVENT, C for COMPETES$)$

$1.$ Find the first names of Athletes who have competed in the Olympics $($eName $=$ Olympics$)$

$2.$ Find the last names of Athletes who have competed in Budapest $($eLocation $=$ Budapest$)$

$3.$ List all the categories the Athletes from Norway have competed in

$4.$ Find the last names of the Athletes who have competed in at least on Event $($NOTE: at least one is NOT the same as more than one$)$