create particular database

I all, I’m new in django and I have studied some manuals. I would ask a good tutorial for database creation. I’m interesting in a Database as follow:
tableOfPatiens →
→ patient1[name, surname etc] → visit1 → [date, diagnostic_a, diagnostic_b…]
→ visit2 → [date, diagnostic_a etc]

→ patient2[…] → visit1
->visit2
tablesOfDiagnostics → diagnostic_a → parameter1, parameter2 etc
→ diagnostic_b → …

where diagnostic_a, diagnostic_b and so on are described in one other database.

it is possibile this type of organization of patiens in Django?
have someone a good manual to create custom databases

many thanks in advance

Have you done the official tutorial Writing your first Django app, part 1 | Django documentation | Django ?

This will show you how Django’s models are used to create the database.