CREATE TABLE table_30224 ("Series #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

What is the series number for the episode with production code bdf109?
SELECT "Series #" FROM table_30224 WHERE "Production code" = 'BDF109'
SELECT "Series #" FROM "table_30224" WHERE "Production code" = 'BDF109'