Today, from science to automobiles, everything is becoming software. In science, computational science is beginning to play a major role as a paradigm following theory and experiment, and automobiles are becoming more computer-centric than mechanical with the arrival of the automated driving car era. Software is at the center of these systems. The core of such software-centric systems is the data system. In this class, we will learn how to use databases, and then we will discuss query processing and data mining behind the databases.