Data set with multiple tables I want to check an algorithm that learns the connections between different tables in a database.

Where can I find datasets that are compound of multiple tables (i.e. more than 5) that have connections between them?

All I can find on the web (mainly on Kaggle.com) are datasets with 1 or 2 tables.

I'm aware that my question is kind of off topic but still I'm sure it can help people that have the same problem as I do
There are many places:

this one is very good: https://relational.fit.cvut.cz/

there are also:

https://datahub.io/search

https://www.reddit.com/r/bigquery/wiki/datasets