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Confusion over NULL
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Information générale
Forum:
Visual FoxPro
Catégorie:
Codage, syntaxe et commandes
Divers
Thread ID:
01203230
Message ID:
01227485
Vues:
20
Tell it to the database.




>Except a discontinuation date can be used to indicate whether the product has been discontinued or not. A blank value in that case indicates it has not. And maybe it never will be.
>
>
>>If the product has not been discontinued, the discontinuation date is most certainly unknown, hence Null.
>>
>>Dan
>>
>>>Hmmm. What about something like product discontinued date? There is no valid date, nor is it unknown (null), if the product has not been discontinued.
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