Doubts about MAC authentication

Hello, System version: freeradius-server-3.0.21 After reading the tutorial of mac authentication on the official website, for the last application scenario "Mac Auth authorization by SSID SQL", why should we create a separate table "SSIDMACAUTH"? Is it OK to put "Calling Station ID" and "Called Station SSID" in the radgroupcheck table to check? Looking forward to your professional guidance. Best regards