user: Question: What is the sum of Ends with a Name of abidal, and has a Since larger than 2007?
Columns: ['Nat.', 'Name', 'Since', 'Goals', 'Ends', 'Transfer fee']
Types: ['text', 'text', 'real', 'real', 'real', 'text']
Sample row: ['ESP', 'V. Valdés ( VC3 )', 1998.0, 0.0, 2010.0, 'Youth system']
SQL:

assistant: SELECT SUM("Ends") FROM "Table" WHERE "Name" = 'abidal' AND "Since" > 2007.0;