Table: racing_results
Columns: year
entrant
chassis
engine
points

Question: Who used Gordini Straight-6 in 1956?
SQL: SELECT "entrant" FROM racing_results WHERE "engine" = 'gordini straight-6' AND "year" = 1956

Question: Who was in 1963?
SQL: SELECT "entrant" FROM racing_results WHERE "year" = 1963