CREATE TABLE table_203_607 (id NUMBER, "catalogue number" CLOB, "artist" CLOB, "release title" CLOB, "format" CLOB, "release date" CLOB)

which format had the most releases ?
SELECT "format" FROM table_203_607 GROUP BY "format" ORDER BY COUNT("release title") DESC LIMIT 1
SELECT "format" FROM "table_203_607" GROUP BY "format" ORDER BY COUNT("release title") DESC FETCH FIRST 1 ROWS ONLY