CREATE TABLE table_203_545 (id NUMBER, "single/ep" CLOB, "release date" CLOB, "label" CLOB, "format ( s ) " CLOB, "uk singles chart position" NUMBER, "notes" CLOB)

which format was used the most according to this chart ?
SELECT "format(s)" FROM table_203_545 GROUP BY "format(s)" ORDER BY COUNT(*) DESC LIMIT 1
SELECT "format(s)" FROM "table_203_545" GROUP BY "format(s)" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY