A minimal relational database in Debian?

[Richard Owlett <rowlett@cloud85.net>]

The last time I needed a relational database my employer was using 
dBaseII on a MS-DOS machine.
What is a functional equivalent in the Debian repository?

I looked at at LibreOffice Base. It was unusable as its "help" system 
provided no intrinsic way to increase fonts to a legible size.

https://packages.debian.org/stable/database/ was not useful as it 
doesn't categorize the list.

Suggestions?
TIA