CREATE TABLE table_203_306 (id NUMBER, "no." NUMBER, "title" CLOB, "directed by" CLOB, "written by" CLOB, "original air date" CLOB)

how many episodes were unaired in u.s ?
SELECT COUNT("title") FROM table_203_306 WHERE "original air date" IS NULL
SELECT COUNT("title") FROM "table_203_306" WHERE "original air date" IS NULL