Who is the employee in “New York City” with a good performance? Give the social security number of the employee.
New York City refers to locationcity = 'New York City'; good performance refers to performance = 'Good'; social security number refers to ssn
SELECT T1.firstname, T1.lastname, T1.ssn FROM employee AS T1  INNER JOIN location AS T2  ON T1.locationID = T2.locationID WHERE T2.locationcity = 'New York City' AND T1.performance = 'Good'