A Data warehouse has its own set of challenges for security. Organizational data warehouse are often very large systems. Once we have extracted and loaded the data from heterogeneous sources we need to integrated the data as it seems to similar but coming from the different sources. Validation is required at all the design phases of the development of the data warehouse. With the rapid developm...

What is the relation between metaphysical necessity and essence? This paper defends view that one of identity: a special case essence. My argument consists in showing best joint theory essence which just The made against backdrop novel, higher-order logic (HLE), whose core features are introduced first part paper. second investigates context HLE. Reductive hypotheses among most natural to be ex...