Re: Unique attributes
Re: Unique attributes
- Subject: Re: Unique attributes
- From: Arturo Perez <email@hidden>
- Date: Thu, 16 Feb 2006 09:48:17 -0500
Ian Joyner wrote:
Anyway, I think that rather than just adding unique to a column or set
of columns that unique could be derived from a candidate key property
somehow. (A candidate key being built on actual data values, rather
than implementation pointers which is how primary and foreign keys are
done in EO.)
This to me is one of the key differentiators between people that do O-R
well and those who don't. The ones that don't think of FK and PK as the
ways to access their data. For me, candidate keys is how one accesses
one's data. The PK and FK are just there to hold the object
tree/map/whatever together.
Interesting discussion,
-arturo
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