Hi

A couple of resources I have found useful lately:

A good MOOC site with content from Microsoft and Universities

https://www.edx.org

Data Management Framework, covers the lifecycle of data management, the DAMA-DMBOK is very good reference material and helps implement good processes and practices

https://www.dama.org/

Data Modelling Essentials by Simsion and Witt

And if you're interested in looking at different types of Database Engines then I would recommend Seven Databases in Seven Weeks by Redmond and Wilson for a brief overview.

Hope this helps.

Stef.