The world of information management hinges on the foundation of databases, powerful tools that store, organize, and retrieve data efficiently. This chapter delves into the heart of databases, clarifying their significance and exploring the realm of relational databases. The chapter begins by unraveling the essence of databases, their role in storing, organizing, and retrieving data. It then delves into relational databases, exploring their architecture, attributes, and calculations. It introduces set operations such as union, difference, and intersection and crucial database operations such as restriction and projection. Each operation is explained with illustrative examples, providing clarity from the practical perspective. To enhance understanding, the chapter concludes with exercises that invite learners to apply the theoretical knowledge to real-world scenarios. For learners who are newcomers to the world of databases, this chapter provides an accessible guide to navigating the landscape of data manipulation.

Authors and Affiliations

1. Institute of Liberal Arts and Science, Kanazawa University, Kanazawa, Ishikawa, Japan

   Wei Weng

Corresponding author

Correspondence toWei Weng.

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