Locking a MySQL database so only one person at once can run a query?

Question

I am having a few issues when people are trying to access a MySQL database and they are trying to update tables with the same information.

I have a webpage written u

Answer 1

You could check if data has been changed before you edit something. In that case if someone has edited data while other person is doing his edit, he will be informed about it.

Kind of like stackoverflow handles commenting.