Vanilla MySQL doesn't support any sort of referential integrity. You can use "InnoDB" tables (here) that add that functionality.

Databases don't just store data. They store relationships between data. A customer places orders. An order contains line items.

There are two categories of integrity constraints: General constraints, which allow you to restrict the data values that are ...

If a table says "this booking belongs to user_id = 10", then: User with user_id = 10 must exist in the users table Ex Chudu: If a ...