Table: raptors_players_6
Columns: player
nationality
position
years_in_toronto
school_club_team

Question: What year(s) did Hakeem Olajuwon play Center for Toronto?
SQL: SELECT "years_in_toronto" FROM raptors_players_6 WHERE "player" = 'hakeem olajuwon'

Question: What position did Jimmy Oliver of the United States play?
SQL: SELECT "position" FROM raptors_players_6 WHERE "nationality" = 'united states' AND "player" = 'jimmy oliver'