One-to-many?

At first, I'd like to say that SimpleCRUD is a great solution for quick CRUD tasks, especially as an alternative for popular ways of easy sharing of structured data (like Google Spreadsheets).
However, first advantage of DB against spreadsheet is relations between tables. If we have only id-by-id relation, it's easy and everything works like a charm, but how to deal with a one-to-many relations? E.g. if one designs a task list and needs to relate a task to several persons. I can't find a way to do it easily, without implementing all this logics manually.

The issue names no files, tests, or entry points. Start by reviewing SimpleCRUD's existing id-by-id relationship handling and how it maps database tables, then determine the expected behavior for one-to-many task/person relations. Done should be defined as supported relationship handling without requiring users to implement the logic manually.

Written by the indexing model from the issue text.