user: Question: When "Speed Metal" is the episode title what is the lowest number?
Columns: ['No.', '#', 'Episode title', 'Director', 'Writer(s)', 'U.S. original airdate', 'Prod. code']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'real']
Sample row: [6.0, 1.0, '"Masters and Students"', 'Todd Waterman', 'David Slack', 'February11,2011', 106.0]
SQL:

assistant: SELECT MIN("No.") FROM "Table" WHERE "Episode title" = '"Speed Metal"';