Table: japanese_grand_prix_1993
Columns: driver
constructor
laps
time_retired
grid

Question: What is the average Laps for andrea de cesaris?
SQL: SELECT AVG("laps") FROM japanese_grand_prix_1993 WHERE "driver" = 'andrea de cesaris'

Question: What is the lowest Grid for jj lehto with over 51 laps?
SQL: SELECT MIN("grid") FROM japanese_grand_prix_1993 WHERE "laps" > 51 AND "driver" = 'jj lehto'

Question: What is the average Grid that has a Time/Retired of +2 laps, and under 51 laps?
SQL: SELECT AVG("grid") FROM japanese_grand_prix_1993 WHERE "time_retired" = '+2 laps' AND "laps" < 51