PLS-01909: : cannot assign supertype instance to subtype

PLS-01909: : cannot assign supertype instance to subtype
Cause: An attempt was made to assign or copy a supertype instance to a container (destination) that can only hold a subtype instance.
Action: Make sure the runtime type of the source of the assignment or copy is the same type as the destination or is a subtype of the destination type

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小智 2018-08-30 19:03

PLS-01909：：不能将??超类型实例分配给子类型,
.原因：尝试将超类型实例分配或复制到只能容纳子类型实例的容器（目标）。,
.操作：确保分配或副本的源的运行时类型与目的地类型相同或是目标类型的子类型,
.

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PLS-01909: : cannot assign supertype instance to subtype

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