CREATE TABLE table_203_874 (id DECIMAL, "year" DECIMAL, "competition" TEXT, "venue" TEXT, "position" TEXT, "event" TEXT, "notes" TEXT)

which venue is listed the most ?
SELECT "venue" FROM table_203_874 GROUP BY "venue" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "venue" FROM "table_203_874" GROUP BY "venue" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1