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Oracle® Database 11g / 12c / 18c error codes ORA-01451: column to be modified to NULL cannot be modified to NULL
ORA-01451: column to be modified to NULL cannot be modified to NULL
Oracle Error Code: ORA-01451
Cause: the column may already allow NULL values, the NOT NULL constraint is part of a primary key or check constraint.
Action: if a primary key or check constraint is enforcing the NOT NULL constraint, then drop that constraint.