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Prime Attributes


Prime Attributes

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Tom Thomson
Tom Thomson
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Comments posted to this topic are about the item Prime Attributes

Tom

Stewart "Arturius" Campbell
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Interesting question, Tom
Thanks, really got the grey matter working on this one.

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DugyC
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Great question Tom, I can say that as I surprised myself by getting the right answer :-D

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It is very good question. I was sure about the half part. Got to revise lots of things.

Basics matter!!

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Sudhir
Gianluca Sartori
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Darn! I don't know why, but I checked "has a different value on each row".
Nice question, Tom.

--Gianluca Sartori

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palotaiarpad
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Hmmmm.
I used the same source (http://en.wikipedia.org/wiki/Database_normalization) i hope (because the link provided on the result page isn't existing), and there is a definition: A prime attribute, conversely, is an attribute that does occur in any candidate key.

But is it wrong then?
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Thanks Tom. (open up QotD and knew immediately who wrote it! :-P )

After your question last week I did some revision so was a little better prepared to tackle this one today. Certainly making me flex the ol' brain in areas that are not as regularly flexed! :-)
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palotaiarpad (10/12/2011)
Hmmmm.
I used the same source (http://en.wikipedia.org/wiki/Database_normalization) i hope (because the link provided on the result page isn't existing), and there is a definition: A prime attribute, conversely, is an attribute that does occur in any candidate key.

But is it wrong then?


The context here is that Non-Prime attribute does not occur in any candidate key, so CONVERSELY, a PRIME attribute does occur in any [but not all] candidate keys

The statement is correct, however the WIKI definition could certainly be worded a little better...
Rob Schripsema
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Too bad half right doesn't count for anything...

Good question, Tom!

Rob Schripsema
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Nice question. Took much too long to shake the cobwebs out of my brain.

If everything seems to be going well, you have obviously overlooked something.

Ron

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