CREATE TABLE table_28171 ("No." 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 that had a production code of 2j5457?
SELECT "Directed by" FROM table_28171 WHERE "Production code" = '2J5457'
SELECT "Directed by" FROM "table_28171" WHERE "Production code" = '2J5457'