user: Question: What is the sum of the difference for 9 draws and over 18 played?
Columns: ['Team', 'Points', 'Played', 'Drawn', 'Lost', 'Against', 'Diff']
Types: ['text', 'real', 'real', 'real', 'real', 'real', 'real']
Sample row: ['Caracas F.C.', 36.0, 18.0, 6.0, 2.0, 12.0, 15.0]
SQL:

assistant: SELECT SUM("Diff") FROM "Table" WHERE "Drawn" = 9.0 AND "Played" > 18.0;