CREATE TABLE table_203_237 (id DECIMAL, "n" DECIMAL, "p" TEXT, "nat." TEXT, "name" TEXT, "age" DECIMAL, "moving from" TEXT, "type" TEXT, "transfer\ window" TEXT, "ends" DECIMAL, "transfer\ fee" TEXT)

what season has the most transfer windows ?
SELECT "transfer\nwindow" FROM table_203_237 GROUP BY "transfer\nwindow" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "transfer\nwindow" FROM "table_203_237" GROUP BY "transfer\nwindow" ORDER BY COUNT(*) DESC NULLS LAST LIMIT 1