How many directors got 6.79 million U.S. viewers from their episodes?
CREATE TABLE table_74322 (
    "No. in series" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
)
SELECT COUNT("Directed by") FROM table_74322 WHERE "U.S. viewers (million)" = '6.79'
Below are sql tables schemas paired with instruction that describes a task. Using valid SQLite, write a response that appropriately completes the request for the provided tables. ### Instruction: How many directors got 6.79 million U.S. viewers from their episodes? ### Input: CREATE TABLE table_74322 (
    "No. in series" real,
    "Title" text,
    "Directed by" text,
    "Written by" text,
    "Original air date" text,
    "Production code" text,
    "U.S. viewers (million)" text
) ### Response: SELECT COUNT("Directed by") FROM table_74322 WHERE "U.S. viewers (million)" = '6.79'