Accept a number of MAC address per login

[ShR3K]

Hello,
I would like to authorize a user to connect to the freeradius server with a
maximum of 3 PC. I added a counter, an attribute for the check-name and a
line in radcheck table but for my counter I'd like a query like this : 
select (COUNT(distinct CallingStationId)) FROM radcheck WHERE
UserName='user_login' AND CallingStationId !='MAC_client'

But there is I think, only one key and I need two.
How can I do it ?

Thank for your help !

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