user: Question: How many weight stats are there for players from San Francisco, CA?
Columns: ['Name', '#', 'Position', 'Height', 'Weight', 'Year', 'Home Town', 'High School']
Types: ['text', 'real', 'text', 'text', 'real', 'text', 'text', 'text']
Sample row: ['Marvin Alexander', 22.0, 'Guard-Forward', '6–4', 190.0, 'Junior', 'Houston, TX', 'Worthing']
SQL:

assistant: SELECT COUNT("Weight") FROM "Table" WHERE "Home Town" = 'San Francisco, CA';