from
The Free On-line Dictionary of Computing (8 July 2008)
drill down
drill-down analysis
<database> (Or "drill-down analysis") To examine data in
greater detail, especially, in {reporting}, to interactively
select some item from a summary and display the data that
contributed to that item, broken down by some extra parameter.
For example, when viewing your company's total worldwide sales
for each month of this year, you might drill down to see
October's sales by country, then again to see October's sales
in Afghanistan by product and so on.
This kind of analysis is often supported by some kind of {data
warehouse}.
(2007-06-04)