The second and the third normal forms

[dullboy]

I don't understand the rules for the second normal form, ie, each column must depend on the whole key and the rule for the third normal form, ie, no column can have any dependency on any other non-key column. Can anybody give me some simple examples to explain that? Thank you very much!

[erickwidya]

try look at this one..
Normalization rules (http://www.datamodel.org/NormalizationRules.html)