mongodb/docs — pull request #149 by chen56 (2012-08-28 03:01:44+00:00)
Title: Update source/use-cases/pre-aggregated-reports.txt

To retrieve several months of daily data：
... { 'metadata.date': 1, 'hourly': 1 } },
new:
... { 'metadata.date': 1, 'daily': 1 } },