CREATE TABLE table_28448 ("Episode #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Prod. code" FLOAT)

How many production codes does 'number one' have?
SELECT MAX("Prod. code") FROM table_28448 WHERE "Title" = 'Number One'
SELECT MAX("Prod. code") FROM "table_28448" WHERE "Title" = 'Number One'