On 2/4/25 10:03, Ron Johnson wrote:

On Tue, Feb 4, 2025 at 11:31 AM Michał Kłeczek <michal@kleczek.org> wrote:

[snip] 

The query to register a visit is:
insert into restaurant_visit
select $user, current_date, restaurant_id, $rating
from restaurant where name = $restaurant_name


It is now completely unclear what it means to change the name of the restaurant for already registered visits.
Is it still the same restaurant with a different name or a different restaurant?

Or let say someone swaps names of two restaurants.
That means a user that goes to the same restaurant every day would register visits to two different restaurants!

Valid concerns, which means that you add a new restaurant record when the name changes.

And there goes your unique index on phone number :)