user: Question: What is the average earnings made by Greg Norman?
Columns: ['Rank', 'Player', 'Country', 'Earnings ( $ )', 'Wins']
Types: ['real', 'text', 'text', 'real', 'real']
Sample row: [1.0, 'Tom Kite', 'United States', 8500729.0, 19.0]
SQL:

assistant: SELECT AVG("Earnings ( $ )") FROM "Table" WHERE "Player" = 'Greg Norman';