👉 Relational Algebra (REL) is a formal system used to manipulate and query data in relational databases. It extends the principles of set theory by introducing operations that work on relations, which are essentially tables with rows and columns representing data entities and their attributes. Key operations in Relational Algebra include union, intersection, difference, projection, and join, which allow for the combination, comparison, and transformation of data. These operations are used to define complex queries and relationships between different data sets, enabling efficient data retrieval and manipulation in database management systems.
