user: Question: What is the average medal total of the country who had 0 silver medals and participated in less than 15 games?
Columns: ['Games', 'First', 'Last', 'Gold', 'Silver', 'Bronze', 'Total', 'Best finish (first/last)']
Types: ['real', 'real', 'real', 'real', 'real', 'real', 'real', 'text']
Sample row: [15.0, 1990.0, 2013.0, 10.0, 5.0, 0.0, 15.0, '1st ( 1990 / 2012 )']
SQL:

assistant: SELECT AVG("Total") FROM "Table" WHERE "Games" < 15.0 AND "Silver" < 0.0;