CREATE TABLE table_203_231 (id NUMBER, "season" CLOB, "tier" NUMBER, "division" CLOB, "place" CLOB)

which tier was ud alzira a part of the least ?
SELECT "tier" FROM table_203_231 GROUP BY "tier" ORDER BY COUNT(*) LIMIT 1
SELECT "tier" FROM "table_203_231" GROUP BY "tier" ORDER BY COUNT(*) FETCH FIRST 1 ROWS ONLY