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I'm developing an app. These images show my database. What you will find there is a sheet called “People” where is the registration of people and the generation of a qr code to give attendance to an event to people. As second sheet you will find “Attendance” where it is related to a form that reads with the section “Code” the QR of the person and in name and dni has a lookup to the table “People”.
The main problem of my app is that I need the code to be read only once, that can be registered once that qr code has been read by the application and that 2 different people can not use the same qr code so I avoid people who can sneak. I need a solution for me to implement in the app fundamentally to be automatic registration that the qr code and that person has already entered the enclosure.
