user: Question: How many directors directed the episode titled "Incoming"?
Columns: ['No.', 'Title', 'Directed by', 'Written by', 'Original air date', 'Production code', 'U.S. Viewers (in millions)']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, '"Pilot"', 'Michael Rymer', 'Christopher McQuarrie', 'June7,2010', '4002-08-101', '4.29']
SQL:

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