Normalization is the process of organizing columns into tables within a relational database in such a way as to minimize redundancy and avoid insertion, update and deletion anomalies.

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Do higher normalized forms always meet the criteria of lower ones?

For example, a database that is 3NF is always 1NF and 2NF; does this hold for 4, 5, and 6?
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Normalization Exercise Resources

I want to sharpen my database normalization skills. Where can I find good quality beginner-to-advanced level exercises (with solutions) on the web ?
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3NF Vs 2NF, which is more strict?

Which of these is true: If a table is in 2nd normal-form then it must be in 3rd normal-form. If a table is in 3rd normal-form then it must be in 2nd normal-form. I know only one of them is ...