CREATE TABLE table_204_104 (id NUMBER, "title" CLOB, "genre" CLOB, "sub\\u00addivisions" CLOB, "libretto" CLOB, "premiere date" CLOB, "place ,  theatre" CLOB, "notes" CLOB)

how many were released after zenone , imperator d'oriente ?
SELECT COUNT(*) FROM table_204_104 WHERE "premiere date" > (SELECT "premiere date" FROM table_204_104 WHERE "title" = "zenone, imperator d'oriente")
SELECT COUNT(*) FROM "table_204_104" WHERE "premiere date" > (SELECT "premiere date" FROM "table_204_104" WHERE "title" = "zenone, imperator d'oriente")