mongodb translation for sql INSERT…SELECT

Question

How to simply duplicate documents from collectionABC and copy them into collectionB if a condition like {conditionB:1} and add a timestamp like ts_imported - without knowing

Answer 1

Mongodb does not have that kind of querying ability whereby you can (inside the query) insert to another collection based upon variables from the first collection.

You will need to pull that document out first and then operate on it.

You could technically use an MR for this but I have a feeling it will not work for your scenario.