There are many causes of erratic results,
such as SQL cloning, weak source control, frequent break-fix work,
and untested code.
One way to keep reports consistent is to build a
Data Mart ETL system
that runs overnight and sets up results in static tables.
To learn more about Data Mart ETL, read my post:
Data Mart ETL Basics
No matter how your reports and analyses are implemented, they're
only as good as the SQL behind them.
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