“…However, such an approach would be both tedious to program and immensely inefficient, given the obvious inter-relationships between the various views. Consequently, in 1995, the data cube operator (an SQL syntactical extension) was proposed by Gray et al [9] as a means of simplifying the process of data cube construction. Subsequent to the publication of the seminal data cube paper, a number of independent research projects began to focus on designing efficient algorithms for the computation of the data cube [4,5,10,11,12,15,16,17,19,21,22,23,24].…”