CREATE TABLE table_203_670 (id DECIMAL, "pos" TEXT, "driver" TEXT, "entrant" TEXT, "constructor" TEXT, "time/retired" TEXT, "grid" DECIMAL)

what entrant has the most drivers ?
SELECT "entrant" FROM table_203_670 GROUP BY "entrant" ORDER BY COUNT("driver") DESC LIMIT 1
SELECT "entrant" FROM "table_203_670" GROUP BY "entrant" ORDER BY COUNT("driver") DESC NULLS LAST LIMIT 1