[Year 12 IT Apps] Normalisation

[ATKINSON-BUCK, Damien]

Hi Michael,
            Below in italics is from an old post from Joseph Papaleo (who I hope doesn’t mind me re-posting) that I found fairly easy to drum in to my students, alongside the overly simplified version that I’ve pilfered bits of from Marks site,
1NF = horizontal
2NF = vertical
3NF = The key, the whole key and nothing but the key, so help me Codd

Cheers
Damien

In a nutshell, I've taught it as :

1NF - tidy the table(s) up horizontally
ie Fields contain only a single value eg Name: Mr Barney Rubble changes to
Title: Mr
Fname: Barney
Sname: Rubble

Remove repeating Groups (as per Mark's comments)


2NF - Tidy the table(s) up Vertically
Eliminate duplication in records down the table by using a Primary Key that each record refers to.
Continue to do this as often as required until duplication is removed from all tables- students should see the need for a new table if there is duplication with their own unique Primary Key.


3NF - Make all fields in a table Mutually Exclusive
ie, no field can rely on another.  eg table may contain "Quantity" and "Price", but it cannot contain "Total Cost" as Total cost = Quantity x Price.



Damien Atkinson-Buck
Head of Learning Area: Technology/Arts

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From: Poke, Michael C [mailto:poke.michael.c at edumail.vic.gov.au]
Sent: Friday, 13 February 2015 10:57 AM
To: itapps at edulists.com.au
Subject: [Year 12 IT Apps] Normalisation

Hi all,
Normalisation...... It's a swear word to me..... Is anyone willing to share their best resources to make it really simple for my students (and for me!) - I'm doing U3O2 first
(and yes, I am a frequent visitor to vceit.com<http://vceit.com>).

Cheers,
Michael

PS Don’t forget to join and contribute to our growing little ITApps community over at Google+… https://plus.google.com/u/0/communities/108389555192787196436



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