Hi
A couple of resources I have found useful lately:
A good MOOC site with content from Microsoft and Universities
Data Management Framework, covers the lifecycle of data management, the DAMA-DMBOK is very good reference material and helps implement good processes and practices
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.