allow nulls
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Should not allow NULLs. | No debe aceptar valores NULL. |
It means that the PRIMARY KEY constraint doesn't allow NULLs whilst the UNIQUE constraint and unique indexes allow an arbitrary number of NULLs. | Esto significa que la restricción PRIMARY KEY no permite nulos mientras que la restricción UNIQUE y los índices unique permiten un número arbitrario de nulos. |
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