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I am creating a website where a particular field in database is edited simultaneously by many users (assume all the users are making same edit). How can I cope with this? I need only one user to get notified that their edit has successfully done.
This is a complicated problem with many possible solutions. Essentially you need a way to lock the table or detect concurrent updates. A common technique for doing this is adding version data to your tables. On every update, you then check the version of the data when it was retrieved from the DB originally against the version of the data right now. If they are different, you know that someone else has changed the data during the update process.
Projects like Hibernate can automate some of this for you, so you should consider using this to help implement table versioning.