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Normalization
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Steve Jones - SSC Editor
Steve Jones - SSC Editor
Posted Tuesday, April 26, 2011 10:04 PM
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Comments posted to this topic are about the item
Normalization
Follow me on Twitter:
@way0utwest
Forum Etiquette: How to post data/code on a forum to get the best help
Post #1099184
Koen Verbeeck
Koen Verbeeck
Posted Tuesday, April 26, 2011 11:35 PM
SSCrazy Eights
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Aaah, back to basics
Thanks for the question!
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Post #1099197
srikant maurya
srikant maurya
Posted Wednesday, April 27, 2011 12:17 AM
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Good Question
Srikant
Post #1099201
Sree Arjun Div
Sree Arjun Div
Posted Wednesday, April 27, 2011 12:30 AM
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Last Login: Wednesday, May 08, 2013 3:44 AM
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going back to basics...ohh good remember the concepts from basic level...
Post #1099207
Carlo Romagnano
Carlo Romagnano
Posted Wednesday, April 27, 2011 1:11 AM
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Great question.
Post #1099217
Chris Houghton
Chris Houghton
Posted Wednesday, April 27, 2011 2:29 AM
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Basic but a great question. Some more like this would be fantastic.
Post #1099241
Richard Warr
Richard Warr
Posted Wednesday, April 27, 2011 3:42 AM
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Nice question and an interesting example. Would renaming the columns "Telephone 1" and "Telephone 2" to "Home Phone" and "Mobile Phone" mean that the table was then in 1NF?
Post #1099280
RonKyle
RonKyle
Posted Wednesday, April 27, 2011 3:53 AM
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Nice question and an interesting example. Would renaming the columns "Telephone 1" and "Telephone 2" to "Home Phone" and "Mobile Phone" mean that the table was then in 1NF?
I would say no, because there can be other categories of phone, such as Business Phone. The phone number may not be the best example because it could be said that "I only want two phone numbers", in which case an argument can be made for having the columns in the main table. Not a great argument, as the single column in a seperate table still makes queries and searches easier, and if someone would ever come a long and decide they want to track three phone numbers, the seperate table is much easier to implement, as it is already so.
Post #1099284
calvo
calvo
Posted Wednesday, April 27, 2011 5:54 AM
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Richard Warr (4/27/2011)
Nice question and an interesting example. Would renaming the columns "Telephone 1" and "Telephone 2" to "Home Phone" and "Mobile Phone" mean that the table was then in 1NF?
Great thought. It's funny how even a definition of something so basic, like 1NF, can still be fuzzy. If you're going by Chris Date's definition, his fourth rule states "Every row-and-column intersection contains exactly one value from the applicable domain (and nothing else)." Now, are all categories of telephone numbers (mobile, home, work etc.) considered of the same "domain"? Not to mention, adding a second telephone number field would mean one of them could possibly be null. Null fields, to some, is also a violation of 1NF.
... I think it's a trick question and I want extra points!
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Post #1099344
SQLRNNR
SQLRNNR
Posted Wednesday, April 27, 2011 6:10 AM
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Excellent question.
Jason
AKA CirqueDeSQLeil
I have given a name to my pain...
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Post #1099354
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