ORA-01451
Error: ORA-01451: column to be modified to NULL cannot be modified to NULL
Causa: The column may already allow NULL values, the NOT NULL constraint is part of a primary key or check constraint, or an ALTER TABLE MODIFY statement attempted to change a column specification unnecessarily, from NULL to NULL.
Acción: If a primary key or check constraint is enforcing the NOT NULL constraint, then drop that constraint.
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