Improved the 'The Data CUBE Operator' section: there are now more accurate descriptions with proper examples that explain why the constructs that the data cube operator generalizes cannot be implemented elegantly without it, how they have to fall back to very daunting SQL statements involving a large amount of group by's.
Improved the 'The Data CUBE Operator' section: there are now more accurate descriptions with proper examples that explain why the constructs that the data cube operator generalizes cannot be implemented elegantly without it, how they have to fall back to very daunting SQL statements involving a large amount of group by's.

wimleers/wpoanalytics,wimleers/wpoanalytics