user: Question: How many different people directed the episode titled "Fright Night"?
Columns: ['Episode #', 'Season #', 'Title', 'Directed by', 'Written by', 'Original airdate', 'Production code #']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [73.0, 401.0, '"Hawaii Bound"', 'Jack Arnold', 'Tam Spiva', 'September22,1972', 72.0]
SQL:

assistant: SELECT COUNT("Directed by") FROM "Table" WHERE "Title" = '"Fright Night"';