SQL calculate years from view

I have a view that has a
EmployeeNumber, companyname, startdate, and enddate

I need to find a way to calculate years of experience for each employeenumber when they worked at the company MYCOMPANY, and also a total of all years worked at another company.

I don't care it this ends up being two rows in the same view for each employeenumber (only one if they don't have other experience), or two different views.



SELECT     EmpNo, CompanyName, Location, Title, StartDate, EndDate
FROM         dbo.EmpWorkHistory AS e
GROUP BY EmpNo, StartDate, EndDate, CompanyName, Location, Title
ORDER BY EmpNo, StartDate

so
1, Google, 1990-1-1, 1991-1-1
1, IBM, 1991-1-1, 1992-1-1
1, XXX, 1992-1-1, 1993-1-1
1, MyCompany, 1993-1-1, 1994-1-1

would give me
1, MyCompany, 1 Year
1, AllOtherCompanies, 3 Years

Thanks!