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Purpose of KEY addition on select fields in CDS views

I have CDS view with aggregation functions ( Mostly SUM ) having characteristic fields as well as key figures. While defining View i did not define Characteristic fields with addition KEY. will it give me wrong data while selecting data? will it cause any performance issue?

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  • Best Answer
    Apr 03 at 07:29 PM
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    • I did read that documentation
      But I am confused

      if I use CDS view with aggregated functions will result set have incorrect data if I use CDS view without key fields.

      Why can't it consider all character fields as KEY and order of key they way they are defined.