How many of the non-sales employees are married?
Married refers to MaritalStatus = 'M';  non-sales employees refer to PersonType = 'EM'
SELECT COUNT(T1.BusinessEntityID) FROM Employee AS T1 INNER JOIN Person AS T2 ON T1.BusinessEntityID = T2.BusinessEntityID WHERE T2.PersonType = 'EM' AND T1.MaritalStatus = 'M'