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On Tue, Oct 11, 2011 at 11:43 AM, Jon Paris <jon.paris@xxxxxxxxxxxxxx> wrote:
I have no concept (although you clearly do) of what "greater
than null" means.
Depending on your database or programming language, empty string is
not the same as null. In any system where these two entities are
different, then it makes perfect sense to think of the empty string as
a (valid) length-zero string, while null is "not a valid value at all"
(i.e. not a valid string, not a valid number, not a valid anything).
As others have noted, there are a few reasonable (but sometimes
conflicting) ways to think of how to compare shorter strings with
longer ones.
John Y.
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