How Can I Query for Unique Value and Update another Field in Same Table If return True mysql php

Question

I want to update mysql table pin if Pin field value is the same as the user input pin.In this case, I want to update appid field in the pin table once the the select query retur

Answer 1

There should be a log table that record each updation of tables. If the record found then system should prevent further updation for that particular record.