How does the online book management system allow users to find and operate their own data tables based on usernames?

Question

For example, in an online book management system, where users perform operations of adding, deleting, modifying, and checking, how can the user generate a data table of his own for adding, deleting, modifying, and checking every time he successfully registers? How can he find the corresponding one based on the user name? data sheet

Answer 1

To register a user, just create table username. This way you can create the user's table, but this doesn't make much sense. If there are tens of thousands of users, wouldn't your table also have tens of thousands? It's best not to do this!