You have created a CDS view and used alias names for some of its elements. In which of the following cases is the alias name mandatory? Note: There are 3 correct answers to this question.

You have created a CDS view and used alias names for some of its elements. In which of the following cases is the alias name mandatory? Note: There are 3 correct answers to this question.
A . CAST( ‘USO’ AS abap.cuky) AS currency_key
B . SUM( revenue ) AS total_revenue
C . Crtdby AS created_by
D . CASE order type WHEN ‘A’ THEN 1 ELSE 0 END AS Order_type
E . ASSOCIATION TO sflight AS_flights

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Answer: A,B,D