CREATE TABLE table_204_26 (id NUMBER, "name" CLOB, "position" CLOB, "birth date/age at start of campaign" CLOB, "games in campaign" CLOB, "club" CLOB)

which club was represented the most ?
SELECT "club" FROM table_204_26 GROUP BY "club" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "club" FROM "table_204_26" GROUP BY "club" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY