Question

explain normalization,1nf,2nf,3nf,4nf,bcnf with an example(through tables)

Asked by: TAFFER23

what is normalization .explain ti with an example also explain 1nf,2nf,3nf,4nf and bcnf and aplly it onto a sample table as an example

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Asked On
2008-04-08 at 09:40:47ID23305339
Tags

dbms

Topics

Databases Miscellaneous

,

Data Manipulation

,

MySQL Server

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Answers

 

by: aneeshattingalPosted on 2008-04-08 at 09:42:39ID: 21307058

 

by: TAFFER23Posted on 2008-04-08 at 09:45:43ID: 21307103

need a much simpler example

 

by: matthewspatrickPosted on 2008-04-08 at 09:46:46ID: 21307116

 

by: TAFFER23Posted on 2008-04-08 at 09:50:11ID: 21307158

theretically it is good but i need some examples too

 

by: TAFFER23Posted on 2008-04-08 at 09:50:41ID: 21307161

examples as in implementation in tables

 

by: matthewspatrickPosted on 2008-04-08 at 09:54:18ID: 21307203

TAFFER23,

With respect, your question seems to be related to an academic class assignment.  If this is in
fact for a class assignment, then EE rules do not allow the Experts to go any further than
aneesh and I have already gone.

Regards,

Patrick

 

by: TAFFER23Posted on 2008-04-08 at 10:02:33ID: 21307287

it isnt a class assignment its because it was asked in an interview

 

by: TAFFER23Posted on 2008-04-08 at 10:05:00ID: 21307308

 

by: dportasPosted on 2008-05-13 at 14:14:15ID: 21559340

"http://support.microsoft.com/default.aspx?scid=KB;en-us;q209534"

Not a reliable source.

"Records should not depend on anything other than a table's primary key." Untrue. Irrelevant even.

"Boyce Codd Normal Form (BCNF), and fifth normal form do exist, but are rarely considered in practical design." That's pretty poor advice. Ten years ago people thought that way. There's no excuse for it today.

 

by: dajoebombPosted on 2009-05-11 at 02:00:34ID: 24352587

"Fourth normal form, also called Boyce Codd Normal Form (BCNF), and fifth normal form do exist, but are rarely considered in practical design."

4NF and BCNF are not the same thing as implied above.

It is very hard to find a good resource on the internet for this

 

by: dajoebombPosted on 2009-05-11 at 02:30:52ID: 24352769

Just to clarify the forms that exist are 1,2,3,BCNF,4NF and 5NF (done in that order)

1Nf to 3Nf look at dependancies of attributes on the Primary Key.(plenty of examples on the net)
BCNF occurs if every determinant is a candidate key. If not split the tables and join with FK.
4NF looks at independant multivalued dependencies (if they are independant then you can split the table, if they are related then keep the table)
5NF looks at splitting the table further. if the data is the same after you have split the table and rejoined (i.e. you do not end up with any spurious tules(extra rows)) then the original relation was not in 5NF(so you split the table to make it in 5NF)

http://bkent.net/Doc/simple5.htm - this is a goodish example but doesnt include BCNF

20120131-EE-VQP-002

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