Hello, good morning everyone.

Could you help? I created a field related to the account object and I want to fill in autometico when creating a record by Dataloader, the CSV file only contains the customer number, but not the account name (Account)

I have tried to populate that field by Process Builder, but I do not start as, the other option is to do a trigger, which as soon as the CSV is loaded, it will be triggered and compare "Customer Number" of my custom object against "Client Number" (Accounts) and if it is the same, fill in the field Master-detail, in my custom object. Do you have any idea how to do this trigger?

Look out for comments.