Can I put copyright on my database?

Answer:

This is a field with different policies all depending on the country or region.

EU: If your database is an original intellectual creation, you can protect it through copyright, which guarantees you exclusive rights to reproduce, adapt, distribute the database or any variation of it. With copyright, you protect the structure of your database and not its content.

https://europa.eu/youreurope/business/running-business/intellectual-property/database-protection/index_en.htm

USA: You can not put copyright on your database.