CREATE TABLE table_203_835 (id DECIMAL, "season" TEXT, "club" TEXT, "country" TEXT, "competition" TEXT, "apps." DECIMAL, "goals" DECIMAL)

which competition occurred the most ?
SELECT "competition" FROM table_203_835 GROUP BY "competition" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "competition" FROM "table_203_835" GROUP BY "competition" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1