CREATE TABLE table_203_339 (id DECIMAL, "year" TEXT, "car" DECIMAL, "start" DECIMAL, "qual" DECIMAL, "rank" DECIMAL, "finish" DECIMAL, "laps" DECIMAL, "led" DECIMAL, "retired" TEXT)

how many total laps have been driven in the indy 500 ?
SELECT SUM("laps") FROM table_203_339
SELECT SUM("laps") FROM "table_203_339"