user: Question: Name the least series number
Columns: ['Series No.', 'Episode No.', 'Title', 'Directed by', 'Written by', 'UK Ratings (BBC2 Rank)', 'Original air date']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text']
Sample row: [7.0, 1.0, '"The Mysteries of the Isles"', 'Various', 'n/a', '2.88m (2)', '13May2012']
SQL:

assistant: SELECT MIN("Series No.") FROM "Table";