CREATE TABLE table_25538 ("No." FLOAT, "#" FLOAT, "Title" CLOB, "Directed by" CLOB, "Written by" CLOB, "U.S. viewers  ( million ) " CLOB, "Rank  ( week ) " CLOB, "Original air date" CLOB)

Who is no. 79 directed by?
SELECT "Directed by" FROM table_25538 WHERE "No." = '79'
SELECT "Directed by" FROM "table_25538" WHERE "No." = '79'