Table: race_results_63
Columns: year
entrant
chassis
engine
pts

Question: What engine has more than 0 pts?
SQL: SELECT "engine" FROM race_results_63 WHERE "pts" > 0

Question: What is the average pots of Alfa Romeo v12 after 1983?
SQL: SELECT AVG("pts") FROM race_results_63 WHERE "engine" = 'alfa romeo v12' AND "year" > 1983