record numbers

Maybe my question is stupid and wrong but I hope that you will understand.
So, image that you need to create web application which will used by many
peoples in one LAN. They processing some documents and every person has the
particular number of documents in particular order (1. person has documents
from 1 to 100, second from 101 to 200 etc), which process with the
particular number (first document -> number 1 in a database). If they all
work in a same time, what is the easiest and the most safety way to manage
that? Adding number manually is the logical solution but if 2 person put the
same number, can they freeze the database or databases are imune on that ?


.

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