CREATE TABLE table_26612 ("No. in series" FLOAT, "No. in season" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "Original air date" TEXT, "U.S. viewers  ( millions ) " TEXT)

Who was the director of the episode called 'If I had a hammer'?
SELECT "Directed by" FROM table_26612 WHERE "Title" = 'If I Had a Hammer'
SELECT "Directed by" FROM "table_26612" WHERE "Title" = 'If I Had a Hammer'