OLAP Interview Question:

The operation of moving from finer-granularity data to a coarser granularity (by means of aggregation) is called a ________.
a) Roll-up
b) Drill down
c) Dicing
d) Pivoting

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a) Roll-up
Explanation:
The opposite operation-that of moving from coarser-granularity data to finer-granularity data-is called a drill down.
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