CREATE TABLE table_28418 ("No." FLOAT, "#" FLOAT, "Title" TEXT, "Directed by" TEXT, "Written by" TEXT, "U.S. viewers  ( million ) " TEXT, "Rank  ( week ) " TEXT, "Original air date" TEXT, "Production code" TEXT)

What was the ranking of episode #19?
SELECT "Rank (week)" FROM table_28418 WHERE "#" = '19'
SELECT "Rank (week)" FROM "table_28418" WHERE "#" = '19'