CREATE TABLE table_204_630 (id NUMBER, "no" NUMBER, "date" CLOB, "race" CLOB, "track" CLOB, "winner" CLOB, "reports" CLOB)

who won the most ?
SELECT "winner" FROM table_204_630 GROUP BY "winner" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "winner" FROM "table_204_630" GROUP BY "winner" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY