user: Question: When was episode 02x07 first broadcast?
Columns: ['Episode', 'First broadcast', 'Andrew and Georgies guest', 'Jamie and Johns guest', 'Scores']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['02x01', '7 October 2010', 'Jimmy Carr', 'Lily Allen', '11–9']
SQL:

assistant: SELECT "First broadcast" FROM "Table" WHERE "Episode" = '02x07';