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Normalization


Normalization

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Mike Is Here
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Basic but very needed fundamental question
Steve Jones
Steve Jones
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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?


I am not the db design guru, but from my understanding, that would be incorrect. The "use" of that property is different, but both home and mobile are the same type of property in relation to the entity.

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Good question.
SanDroid
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Nice question Steve.
We never have to guess or debate an answer with you.
Steve Jones
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SanDroid (4/27/2011)
Nice question Steve.
We never have to guess or debate an answer with you.


Ha! I've made plenty of mistakes and had some sketchy questions. :-P

I am trying to get better and have learned to write questions that probe a bit without trying to trick someone.

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SanDroid
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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?

No, but you could normalize the Phone number type.
Defining a table to store the repeating types of phone numbers.

You could start by adding another Table called Phone_Number_Types with an Id coulumn.
Then you could use a lookup table to match the repeating Phone_Numbers to the repeating Phone_Number_Types for each Employee.
SanDroid
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Steve Jones - SSC Editor (4/27/2011)
I am trying to get better and have learned to write questions that probe a bit without trying to trick someone.


"without trying to trick someone"
That says it all.
If you are going to tell 70% or more of a community that they are wrong, you should never try to trick them.
Doing this could activate the kind of basic defense mechanisms that are counter productive to learning.
M&M
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Nice question, testing our basics.:-)

M&M
Trey Staker
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Excellent question, Thanks!

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Nice question, thanks!
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