The discriminant tells us there are two roots when positive, one root when zero, and no roots when negative. b^2-4ac = (-8)^2-4*3*1 = 52 is positive, so there are two roots. The discriminant is just part of the quadratic equation. The quadratic equation gives us the exact real number roots of any equation in the form ax^2+bx+c=0. The quadratic equation is x = (-b \pm sqrt(b^2-4ac))/(2a), where \pm means that we have two values, one using + (addition) and one using - (subtraction). Let D = b^2-4ac.
A data warehouse is a special type of database used for analysis of data. A general database is usually used for transaction processing, and hence, it is not optimized for analysis and reporting. But a data warehouse is specially designed and optimized for analysis tasks.
In essence, the purpose of thedata warehouse is to get data out of the system,and turn it into information. This analysis-driven, time variant data are often pre-summarized into levels usable for decisionsupport, negating the need to summarize atomiclevel data in query operations.he SAS Rapid Data WarehouseMethodology Professional Services Division has developed aRapid Data Warehouse Methodology to ensure adisciplined, iterative, approach in themanagement and implementation of datawarehousing projects.