CREATE TABLE table_203_764 (id DECIMAL, "name" TEXT, "date" DECIMAL, "nation" TEXT, "displacement" TEXT, "speed" TEXT, "number" DECIMAL, "notes" TEXT)

what is the top speed ?
SELECT "speed" FROM table_203_764 ORDER BY "speed" DESC LIMIT 1
SELECT "speed" FROM "table_203_764" ORDER BY "speed" DESC NULLS LAST LIMIT 1