user: Question: How many series did John Banas direct?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [337.0, 1.0, '"Till Death Do Us Part"', 'Cameron Welsh', 'Louise Crane-Bowes', '28February2006']
SQL:

assistant: SELECT COUNT("No. in series") FROM "Table" WHERE "Directed by" = 'John Banas';