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Well, PRIMARY keys and UNIQUE keys are both changeable. And it's probably
not in violation of Dodd. I think the change can be CASCADEd down to
dependent files.
The difference between PRIMARY and UNIQUE is that you can have only one
primary key (composed of one or more columns). You could have multiple
UNIQUE keys (again composed of one or more columns).
An example might be on THEKEY to your CITY table. That would be your
PRIMARY. You could have a UNIQUE composed of CityName and State. You
could have another UNIQUE on some CITYCODE column which may be from some
government handbook. That column might have to be null capable for cities
outside of the area of concern about that government handbook.
But getting back on track. You're right, we probably didn't think about
the users changing the PRIMARY key.
Rob Berendt
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