CREATE TABLE table_name_70 (year VARCHAR, engine VARCHAR, chassis VARCHAR)

In what year did a car have a yamaha v12 engine and a brabham bt60y chassis
SELECT year FROM table_name_70 WHERE engine = "yamaha v12" AND chassis = "brabham bt60y"
SELECT "year" FROM "table_name_70" WHERE "brabham bt60y" = "chassis" AND "engine" = "yamaha v12"