user: Question: When Aspect Computing is the yacht what is the sail number?
Columns: ['Position', 'Sail Number', 'Yacht', 'State/Country', 'Yacht Type', 'LOA (Metres)', 'Skipper', 'Elapsed Time d:hh:mm:ss']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'US17', 'Sayonara', 'USA', 'Farr ILC Maxi', '24.13', 'Larry Ellison', '2:19:03:32']
SQL:

assistant: SELECT "Sail Number" FROM "Table" WHERE "Yacht" = 'Aspect Computing';