Table: spanish_grand_prix_1969
Columns: driver
constructor
laps
time_retired
grid

Question: What is the average grid number for cars that retired due to engine failure before 18 laps?
SQL: SELECT AVG("grid") FROM spanish_grand_prix_1969 WHERE "time_retired" = 'engine' AND "laps" < 18

Question: What is the time/retired for jo siffert with a grid under 11?
SQL: SELECT "time_retired" FROM spanish_grand_prix_1969 WHERE "grid" < 11 AND "driver" = 'jo siffert'

Question: What driver has under 19 laps and a grid under 10?
SQL: SELECT "driver" FROM spanish_grand_prix_1969 WHERE "laps" < 19 AND "grid" < 10