CREATE TABLE table_204_63 (id DECIMAL, "round" DECIMAL, "circuit" TEXT, "date" TEXT, "pole position" TEXT, "winning driver" TEXT, "winning team" TEXT, "trophy winner" TEXT)

which winning team won the least ?
SELECT "winning team" FROM table_204_63 GROUP BY "winning team" ORDER BY COUNT(*) LIMIT 1
SELECT "winning team" FROM "table_204_63" GROUP BY "winning team" ORDER BY COUNT(*) NULLS FIRST LIMIT 1