CREATE TABLE table_54728 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is the sum of laps for Derek Warwick?
SELECT SUM("Laps") FROM table_54728 WHERE "Driver" = 'derek warwick'
SELECT SUM("Laps") FROM "table_54728" WHERE "Driver" = 'derek warwick'