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ABENCDS_PATH_EXPR_CARD_V2 - CDS PATH EXPR CARD V2

ABENCDS_PATH_EXPR_CARD_V2 - CDS PATH EXPR CARD V2

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- CDS View Entity, path_expr, Cardinality

...  1$|*: ...

Effect

Specifies the cardinality of the current CDS association:

  • If the attribute 1: is specified, the current CDS association is declared as unique.
  • If the attribute *: is specified, the current CDS association is declared as non-unique.

The addition 1: makes it possible to use filter conditions in path expressions, which are used in WHERE clauses or HAVING clauses. In a clause like this, it overwrites the cardinality of the CDS association. Please be aware that the transformation into a join expression can vary depending on the database system used.

The addition 1: or *: cannot be specified as the only addition in square brackets. It must always be combined with a filter condition.

Note

The addition 1: prevents a syntax error if a path specified with filter conditions or with a non-unique cardinality is used in a WHERE clause or HAVING clause. However, at runtime, there's no check to validate whether the condition achieves the required unique cardinality.






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