Include individuals with no activities

Dear Guru's

I have 3 Tables 

1.  'Employees' A list of all employees  // a master list of all Employees which has a relationship with 'Invoice DATA' based on employee name, there is only 1 column in this table which is [Employee Name].

2.  'Invoice DATA' The number of invoices completed per Sales Person // data has mulitple columns which include [Employee Name], [Date of invoice] & [# Invoices] etc

3.  'Country list' A list of all our countries // a master list of all our countries which has a relationship with 'Invoice DATA' based on [Country name], there is only 1 column in this table which is [Country Name]

As expected, when I use the 'Invoice DATA', I can generate a list of Employees and the number of invoices per Employee.  

BUT, this list using 'Invoice Data' will only show you the Employees who actually have completed any invoices, obviously would not show any data for employee WITHOUT any invoices.

I was hoping if I start off with a base list from the table 'Employees' [Employee Name] that I could then see a list of all Employees and for those employees that have No data in the table 'Invoice DATA' then it will show 0.

But I am unable to succeed because i also need to be able to filter for Country.

Any Ideas?