I have a database used by an NGO where we have 1900 caregivers taking care of 5500 clients in Swaziland. Among others I have a table for the caregivers and another table for the clients and these two are connected in a query via the ID number of the caregivers. However, I realise that some client information have not been submitted and now it seems as if there are some caregivers without any clients. I would like to create a query consisting of the two tables but which indicate which of the caregivers DO NOT have any clients so that I can start working on obtaining the outstanding information. It might work if I test for caregiver IDs which exist in the caregiver table but do NOT exist in the caregiver/client query. But I cannot think of a way to do this. Any solutions will be highly appreciated.