service not installed

[cheche]

How can I know what computers have not installed "my service"?

[cheche]

Works fine. Thanks!

[Hemoco]

Select tblComputers.Computername, tblComputers.ComputerUnique,
tblComputers.Domain
From tblComputers
Where tblComputers.Computername Not In (Select tblservices.Computername
From tblservices Where tblservices.Name = 'my service')