C, C++, SQL, STL guy from the way-back machine. If it ever hoped to manage data, I've probably used it, and optimized it.
Used every kind of dbms drempt up over the last 25 years, and wrote a couple of my own. A temporal database, and an In-Memory database.
Have used Hierarchical, Network/BOM, Relational, Object, Object-Relational and even Informix back when it was just an ISAM. Currently having a ball building complex, real-time watch-dog apps using C++ and the STL for a telco.