CREATE TABLE table_204_421 (id DECIMAL, "name" TEXT, "nationality" TEXT, "position" TEXT, "spartak career" TEXT, "appearances" DECIMAL, "goals" DECIMAL)

who had the highest number of appearances ?
SELECT "name" FROM table_204_421 ORDER BY "appearances" DESC LIMIT 1
SELECT "name" FROM "table_204_421" ORDER BY "appearances" DESC NULLS LAST LIMIT 1