System and method for generating multi-representations of a data cube

摘要: An apparatus and method for approximating the data stored in a databases by generating multiple projections representations from database such that OLAP queries original (such as aggregation histogram operations) may be applied to approximated version of database, which can much smaller than databases. Other aspects optimize mapping, via mapping (or dimension) table, non-numeric or numeric attributes other error incurred on applying is minimized. Still further define boundaries approximations so are preserved when versions generated.