Table: race_results_71
Columns: year
entrant
chassis
engine
points

Question: What is the average Year with Chassis equalling cooper t60?
SQL: SELECT AVG("year") FROM race_results_71 WHERE "chassis" = 'cooper t60'

Question: Which Chassis has an Entrant of cooper car company, and a Year of 1963?
SQL: SELECT "chassis" FROM race_results_71 WHERE "entrant" = 'cooper car company' AND "year" = 1963

Question: Which Entrant has an Engine of climax straight-4, and Points larger than 0?
SQL: SELECT "entrant" FROM race_results_71 WHERE "engine" = 'climax straight-4' AND "points" > 0