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Discuss content posted by Tom Thomson
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Prime Attributes
19 posts, Page 2 of 2
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charles evans
charles evans
Posted Wednesday, October 12, 2011 11:26 AM
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Oops, mistook the word "every" for "any" in the candidate key answers.
Post #1189342
Trey Staker
Trey Staker
Posted Wednesday, October 12, 2011 11:31 AM
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Thanks for the question Tom. Your questions always make my brain hurt.
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Post #1189345
L' Eomot Inversé
L' Eomot Inversé
Posted Wednesday, October 12, 2011 11:42 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?
Not the same page, but one just as good; I'm not sure what happened to that reference, it was cut and paste from my browser address bar. The definition on the wikipedia page you found contained a strange use of "any": "any" meaning "some". This is sort of logical but is a very unusual usage, so people get confused when "any" is used like that, and sometimes think it means "every". That wikipedia page has now been corrected and uses "some" instead of "any" which should be clearer.
The writer of the original definition on the wikipedia page can be excused because he probably though that misinterpretation of that "any" would be avoided by that little word "conversely", which is saying that "prime" is the converse of "non-prime" which is defined immediately above (and the converse of "it isn't in any candidate key" is "it is in some candidate key") but it's better to avoid unusual usage and aim for clarity in something like wikipedia.
Tom
Is minic a gheibheann béal oscailte dorn dúnta.
Is minig a cheapas beul fosgailte dòrn dùinte.
Post #1189355
palotaiarpad
palotaiarpad
Posted Thursday, October 13, 2011 3:48 AM
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Thanks, now it's clear that my english has to be improved.
Post #1189694
Danny Ocean
Danny Ocean
Posted Thursday, October 13, 2011 3:56 AM
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Good question tom
Keep Learning - Keep Growing !!!
http://growwithsql.blogspot.in
Thanks
Vinay Kumar
Post #1189702
rfr.ferrari
rfr.ferrari
Posted Thursday, October 13, 2011 5:23 AM
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very good question!!!
thanks Tom!!
rfr.ferrari
DBA
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2008
MCITP | MCTS
remember is live or suffer twice!
Post #1189730
Britt Cluff
Britt Cluff
Posted Thursday, October 13, 2011 5:45 AM
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You always submit tough questions. Thanks for making us think.
http://brittcluff.blogspot.com/
Post #1189747
SQLRNNR
SQLRNNR
Posted Thursday, October 13, 2011 7:54 AM
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Thanks for the question Tom.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
MCM SQL Server 2008
SQL RNNR
Posting Performance Based Questions - Gail Shaw
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Post #1189842
Koen Verbeeck
Koen Verbeeck
Posted Tuesday, October 25, 2011 11:43 PM
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Great question. You got me at "unique value for every row".
How to post forum questions.
Need an answer? No, you need a question.
What’s the deal with Excel & SSIS?
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Post #1196080
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