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.
Get started or reach the next level of SQL expertise with
my 2-day courses:
T‑SQL Programming, and
For details, click on a course name. Or go to the
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check out my Training Features.