The following is the ORA-22894 error message, you can learn the cause and solution of the Oracle database error.


ORA-22894 cannot add constraint on existing unscoped REF columns of non-empty tables

Cause: An attempt was made to add a constraint to existing unscoped REF columns of a table which contains one or more rows.

Solution: Remove the constraint specification or add the constraint after emptying the table.

Case:

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