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Prime Attributes
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L' Eomot Inversé
L' Eomot Inversé
Posted Tuesday, October 11, 2011 9:46 PM
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Comments posted to this topic are about the item
Prime Attributes
Tom
Que conclure à la fin de tous mes longs propos? C'est que les préjugés sont la raison des sots. (Voltaire, 1756)
Post #1188858
Stewart "Arturius" Campbell
Stewart "Arturius" Campbell
Posted Wednesday, October 12, 2011 12:36 AM
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Interesting question, Tom
Thanks, really got the grey matter working on this one.
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Space, the final frontier? not any more...
All limits henceforth are self-imposed.
“libera tute vulgaris ex”
Post #1188893
DugyC
DugyC
Posted Wednesday, October 12, 2011 5:26 AM
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Great question Tom, I can say that as I surprised myself by getting the right answer
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"The difficult tasks we do immediately, the impossible takes a little longer"
Post #1189027
CoolCodeShare
CoolCodeShare
Posted Wednesday, October 12, 2011 6:27 AM
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It is very good question. I was sure about the half part. Got to revise lots of things.
Basics matter!!
Best Regards,
Sudhir
Post #1189060
spaghettidba
spaghettidba
Posted Wednesday, October 12, 2011 6:35 AM
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Darn! I don't know why, but I checked "has a different value on each row".
Nice question, Tom.
Get your two-cent-answer quickly
The Spaghetti DBA
Post #1189067
palotaiarpad
palotaiarpad
Posted Wednesday, October 12, 2011 7:43 AM
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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?
Post #1189136
OzYbOi d(-_-)b
OzYbOi d(-_-)b
Posted Wednesday, October 12, 2011 8:51 AM
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Thanks Tom. (open up QotD and knew immediately who wrote it!
)
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!
Post #1189220
OzYbOi d(-_-)b
OzYbOi d(-_-)b
Posted Wednesday, October 12, 2011 8:58 AM
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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...
Post #1189228
Rob Schripsema
Rob Schripsema
Posted Wednesday, October 12, 2011 9:11 AM
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Too bad half right doesn't count for anything...
Good question, Tom!
Rob Schripsema
Accelitec, Inc
Post #1189236
bitbucket-25253
bitbucket-25253
Posted Wednesday, October 12, 2011 9:34 AM
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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
Please help us, help you -before posting a question please
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Before posting a performance problem please
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Post #1189256
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