user: Question: How many networks are there that have a channel number 7?
Columns: ['Channel', 'Band', 'Video Frequency', 'Audio Frequency', 'Station', 'Network', 'Transmission', 'Format', 'Status']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [7.0, 'UHF', '189.250- MHz', '194.750- MHz', 'TV1', 'RTM', 'Analog', 'SDTV', 'Public']
SQL:

assistant: SELECT COUNT("Network") FROM "Table" WHERE "Channel" = 7.0;