ORA-01779: cannot modify a column which maps to a non key-preserved table

ORA-01779: cannot modify a column which maps to a non
key-preserved table

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ORA-01779: cannot modify a column which maps to a non key-preserved table..

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Cause: An attempt was made to insert or update columns of a
join view which map to a non-key-preserved table.

Action: Modify the underlying base tables directly.

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