Oracle : Ошибка ORA-01761

"DML operation does not map to a unique table in the join"
*Cause: The primary table is the base table against which the update,
insert or delete operation is finally being done. For delete
either there is no primary table in the join query or there is
more than one. For update or insert the columns specified map
to more than one base table.
*Action: Change the join specification.

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