Extracting Database EAFC

Dear all,
I was wondering if someone could help me understand on how to extract player database from EAFC.
I'm using FIFA Editor Tool, and I'm managing to extract all the data from fifa_ng_db, cards_uxr_db, etc.
First of all:

1. What are the differences between these files?
2. Why are some players missing from these files? It seems like the one that you get by updating the rosters are not present

If someone knows, please help.
I would like to extract all the players data with the...

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