Where can I find examples of common DB structures for different things?

Question

MySQL

Hello.
Where can I find examples of the implementation of various common things at the database level, such as comments for comments, likes for posts, etc.?

Answer 1

dbpatterns.com
More specifically: likes .
Unfortunately, the project is still raw, I don’t find any banal trees there, but you can always contribute.
About the comments - you need tree structures. Usually such things are done using the parent-child (adjacency) model.