How to determine the associated user accounts?

There is a database with physical and legal. persons. Addresses, phone numbers, personal data, email, and more. What methods can be used to determine what user is using multiple accounts for work and link them in the database?
Cookie: if it comes with different browser will not help
IP: one IP can be many users
Jur. address: Again, in the same building, there may be several companies
Help to be defined with some tracking algorithm.
July 2nd 19 at 13:28
1 answer
July 2nd 19 at 13:30
There is a database with physical and legal. persons. Addresses, phone numbers, personal data, email, and more. What methods can be used to determine what user is using multiple accounts for work and link them in the database?


In this situation, in my opinion, options 2. Or indirectly (to write the system of analysis all at once, Cookies, IP addresses, etc., which would have tied everything together and gave a certain percentage of probability that the user belongs to one group or another company) or You can ask the user which company they belong to.

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