Which database does facebook use?
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Does aggregate and fact tables gets populated from transactional data with only diffrence in there granularity? Please clarify?
WHAT IS CARDINALITIES OF JOIN?
First input columns brand, mt, re values are ov, 1,re vg, 2,re wu ,3,re. Second input columns are brand, mt, cx their records are ov,4,vg ,5,cx Wu, 6,cx and third input columns brand, mt, rt values are ov,7,rt vg, 8,rt wu, 9,rt but my output is brand, re, cx,rt values are ov, 1,4,7 vg, 2,5,8 wu, 3,6,9
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