Hi Raul,

Wednesday, July 03, 2002, you wrote:

RC> First, I send allready a correction but it apears it didn't got
RC> there ! It was:

Perfect: this is exactly what I meant! :)

RC> No, It's a matter of classification:
RC> - a UNIQUE KEY is a CONSTRAINT
RC> - a FOREIGN KEY is a CONSTRAINT
RC> - a CHECK is, also, a CONSTRAINT
RC> - a column NOT NULL is a CONSTRAINT

RC> Another thing is that:
RC> - a FOREIGN KEY can reference only a PRIMARY KEY or a UNIQUE KEY.

Okay, it's clear now, as Helen said later!

RC> That's all.

More than clear, thank you! ^_^

Kind regards,
--
Matteo

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