Table: race_results_76
Columns: year
entrant
chassis
engine
points

Question: Who is entered earlier than 1975 and has a Lotus 20 chassis?
SQL: SELECT "entrant" FROM race_results_76 WHERE "year" < 1975 AND "chassis" = 'lotus 20'

Question: Which engine has a Lotus 49c chassis?
SQL: SELECT "engine" FROM race_results_76 WHERE "chassis" = 'lotus 49c'

Question: What are the average points of Scuderia Scribante with a Brabham bt11 chassis before 1968?
SQL: SELECT AVG("points") FROM race_results_76 WHERE "entrant" = 'scuderia scribante' AND "chassis" = 'brabham bt11' AND "year" < 1968

Question: How many points are there for a Mclaren m23 chassis later than 1972?
SQL: SELECT COUNT("points") FROM race_results_76 WHERE "year" > 1972 AND "chassis" = 'mclaren m23'