effects of defining an attribute as Unique Key

In the source editor I can define an attribute as Unique Key. What are the concrete effects in my DDL & ETL scripts? And what is the idea behind this possibility?

I made a full generation for my test purposes and can identify this attribute as still being part of my sat but not part of the SAT-Hash-Diff-Calculation. Are there are more effects?

Kind regards,

Birgitta

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