Cause: An attempt was made to modify the column type to object, REF, neste

ORA-22858: invalid alteration of datatype

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Answer Posted / guest

Cause: An attempt was made to modify the column type to
object, REF, nested table, VARRAY or LOB type.

Action: Create a new column of the desired type and copy the
current column data to the new type using the appropriate
type constructor.

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