CREATE TABLE table_73843 ("Series #" FLOAT, "Season #" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "Original air date" CLOB, "Production code" CLOB, "U.S. viewers  ( million ) " CLOB)

Who directed the episode with production code ca303?
SELECT "Directed by" FROM table_73843 WHERE "Production code" = 'CA303'
SELECT "Directed by" FROM "table_73843" WHERE "Production code" = 'CA303'