There are good reasons to have "NULL" values - though they can make the live
a bit harder. Use them - even Microsoft has found out, that they made a
big mistake
in .NET 1.x and corrected them in 2.0 by introducing nullable types.
Darren Duncan schrieb:
You can save your self a lot of grief by declaring all of your fields
to be NOT NULL and default the text fields to the empty string, ''.
Use '' rather than NULL when you don't have a name. Then you can
simply say "where foo=''". -- Darren Duncan
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