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dbnull ( numeric_expr )
dbnull ( database_number , numeric_expr )
dbnull ( database_number , recordset_number , numeric_expr )
dbnull ( string_expr )
dbnull ( database_number , string_expr )
dbnull ( database_number , recordset_number , string_expr )
devuelve boolean_value
Return a true if the specified column number or name of the current row of the open recordset is a NULL vale. If the field contains a value a false will be returned.
Traducción
Devuelve VERDADERO si el número de columna especificada o el nombre de la fila actual del conjunto seleccionado es un valor NULO (NULL). Si el campo contiene un valor se devolverá FALSO
See example of usage on DBOpen page.
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