user: Question: What is the earliest launch that was from Beijing?
Columns: ['Name', 'Hanzi', 'Origin', 'Launch', 'Owner']
Types: ['text', 'text', 'text', 'real', 'text']
Sample row: ['Anhui Satellite Television', '安徽卫视', 'Anhui', 1997.0, 'Anhui Television (AHTV)']
SQL:

assistant: SELECT MIN("Launch") FROM "Table" WHERE "Origin" = 'Beijing';