user: Question: How many number in series's are written by Greg Haddrick?
Columns: ['No. in total', 'No. in series', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['14/15', '1/2', '"Aussie Bob & Kiwi Terry" / "Bad Habits"', 'Ken Cameron', 'Peter Gawler', '9February2009']
SQL:

assistant: SELECT COUNT("No. in series") FROM "Table" WHERE "Written by" = 'Greg Haddrick';