Database Normalization and Normal Forms

Hi All,
I want to know what is database normalization and how do we differentiate between differnt normal forms.wat is the difference b/w first,second,third ,fourth and fifth normal forms.
How do we recognize that in which normal form a table is in.
All ur help will be heartly appreciated.
Thanks and regards,

There is a good introduction to Normalisation on the Wikipedia. While you're at it memorise the 12 Rules of Codd (there are in fact thirteen of them due to the presence of a Rule 0).
How do we recognize that in which normal form a table is in.By using skill and judgement. Normalisation refers to data redundancy within a database, so it might be difficult to spot duplicated data in a single table. The absence of unique keys is one indicator. The presence of column names like XXX_DATE_1, XXX_QTY_1, XXX_DATE_2, XXX_QTY_2,etc is another. Currently I am working on a datawarehouse with feeds from some very old systems; one has tables with columns like SOME_CONDITION_Y and SOME_CONDITION_N - these are flag columns if SOME_CONDITION_Y is null and SOME_CONDITION_N is not null then SOME_CONDITION is false. One such flag has four of these columns!
Cheers, APC

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Hello Craig,
Thank you Craig for your answer.
I must confess that I am also not familiar with EAV theoretical background and concept. Till recently I even did not know that this kind of problem could be placed
in theoretical background called EAV. This put smile nad releive on my mind. Because since this moment I do not feel this kind of problem as some exception or
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I am only conceptually familiar with EAV modeling, so I don't claim to be an expert! ;-) Given the abstract way in which data is stored with EAV, I would suggest that you first create a SQL Query that will produce the desired record set.
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Ok, I think I understand it.
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