CREATE TABLE table_1140067_2 (date VARCHAR, pole_position VARCHAR)
SELECT date FROM table_1140067_2 WHERE pole_position = "Alain Prost"
Alain Prost ขึ้นโพลโพซิชั่นวันที่เท่าไหร่คะ?
What was the date for the pole position of alain prost?