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- Causa
- column-name CANNOT BE A COLUMN OF A PRIMARY KEY, A UNIQUE CONSTRAINT, OR A PARENT KEY BECAUSE IT CAN CONTAIN NULL VALUES.
The code is used to report that a column identified in a PRIMARY KEY, a UNIQUE constraint clause, or a parent key (via a REFERENCES clause) is
defined to allow null values.
- Ação do sistema
- The statement cannot be executed.
- Resposta ao Desenvolvedor
- In the case of a column identified in a PRIMARY KEY or a UNIQUE constraint clause, correct the statement and rerun it.
In the case of a column identified in a REFERENCES clause, drop the parent table then recreate it with referenced columns defined as NOT NULL.
Afterwards, rerun the statement.
SQLSTATE: 42831
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