Knowledge Drop

What is a fanout?

  • 5 April 2021
  • 0 replies
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Userlevel 5

Last  Updated: Jan 21, 2019

A "fanout" happens when you join two tables and a single value gets duplicated in the end result. This screws up aggregation since some of the values are being double counted. "Symmetric aggregates" was invented to prevent bad aggregation due to fanouts.

 

 

 

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