CREATE TABLE table_55851 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the average Laps for andrea de cesaris?
SELECT AVG("Laps") FROM table_55851 WHERE "Driver" = 'andrea de cesaris'
SELECT AVG("Laps") FROM "table_55851" WHERE "Driver" = 'andrea de cesaris'