How many employees report to Nancy Edwards?
SELECT count ( * )  FROM employees AS T1 JOIN employees AS T2 ON T1.id  =  T2.reports_to WHERE T1.first_name  =  "Nancy" AND T1.last_name  =  "Edwards"
count employees reporting to a person = count(*) WHERE condition matches the person's name; reports to Nancy Edwards refers to T2.reports_to links to T1.id AND T1.first_name = 'Nancy' AND T1.last_name = 'Edwards';