user: Question: What's the highest season number of an episode in the series?
Columns: ['No. in series', 'No. in season', 'Title', 'Directed by', 'Written by', 'Original air date', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [47.0, 1.0, '"Revenge Is Best Served Cold"', 'Danny Cannon', 'Carol Mendelsohn & Anthony E. Zuiker', 'September26,2002', '30.47']
SQL:

assistant: SELECT MAX("No. in season") FROM "Table";