Inhealthcare, real-life data is highly coveted, as it represents authentic information in all its complexity. Its value lies not only in its authenticity, but also in its rarity. Health Data Warehouses (HDWs), which are massive databases containing the medical information of a large population, have developed considerably in recent years, driven by the French government.In recent years, health data warehouses (HDWs), which are massive databases containing medical information from a large population, have been widely developed, driven by public authorities in particular, and mainly in hospitals, in order to make secondary use of health data for research purposes. These EDS are increasingly being used to test artificial intelligence (AI) algorithms, with the aim of improving disease diagnosis and treatment, as well as medical research.