Anastasios Skarlatidis

Online analytical processing (OLAP) systems are commonly used in many Business Intelligence, Analytics and Data Science applications. According to Wikipedia, “OLAP is an approach to answer multi-dimensional analytical queries swiftly in computing”. Compared to traditional relational database systems, the main difference is that the data in an OLAP system is being stored in a pre-aggregated and multi-dimensional form. The main benefit of storing data in such form, is that it is optimized for ad-hoc complex aggregations. »