On 7/8/2016 9:15 AM, Johan De Meersman wrote:
As a clear example of what it is useful for, imagine a situation where you're
performing an inventory on an existing warehouse. You have the
list of all the
products they've ever sold, but you need to differentiate between
'this product is
not in stock' (count = 0) and 'I have not counted this product
yet' (count IS NULL).
Excellent example
-bill
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