If I'm from the Muscle Machine Inc, to which e-mail adress should I write a letter if I want to reach the superior of my sales representitive?
Muscle Machine Inc is name of customer; superior refers to 'reportsTO', who is the leader of the 'employeeNumber'
SELECT t2.email FROM customers AS t1 INNER JOIN employees AS t2 ON t1.salesRepEmployeeNumber = t2.employeeNumber WHERE t1.customerName = 'Muscle Machine Inc'