user: Question: What's the highest series number ? 
Columns: ['Series #', 'Episode #', 'Title', 'Directed by', 'Written by', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text']
Sample row: [23.0, 1.0, '"Guess Who\'s Not Coming to Dinner"', 'James Burrows', 'David Kohan & Max Mutchnick', 'September21,1999']
SQL:

assistant: SELECT MAX("Series #") FROM "Table";