Show who has more than one value in field
I have one Table with two fields: Deliveries::client_id and Deliveries::product_organisation_name
It is an excerpt of a bulky export which shows for what organization_name a client had a registration.
I would like to have a script or find command which shows me which client_id's have more than one sort of product_organisation_name. The result should be a list of client_id's. So, client_id 297026 should show up, and 297015, 297022 and 297029 should not be on the list. (see screenshot)
Please help, tnx.