user: Question: Which Goal Difference has 28 Points, and a Club of cd cartagena, more than 15 losses?
Columns: ['Position', 'Club', 'Played', 'Points', 'Wins', 'Draws', 'Losses', 'Goals for', 'Goals against', 'Goal Difference']
Types: ['real', 'text', 'real', 'real', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: [1.0, 'Córdoba CF', 30.0, 40.0, 16.0, 8.0, 6.0, 48.0, 22.0, 26.0]
SQL:

assistant: SELECT "Goal Difference" FROM "Table" WHERE "Points" = 28.0 AND "Club" = 'cd cartagena' AND "Losses" > 15.0;