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Types of data independence
Data independence can be classified into the following two types:
Physical Data Independence: This means that for any change made in the physical schema, the requirement to change the logical schema is minimal. This is practically simpler to achieve.
Logical Data Independence: This means that for any change made in the logical schema, the requirement to change the external schema is minimal. As we shall see, this is a little complex to achieve.
What is 2NF? A relation schema R is in 2NF if it is in 1NF and every non-prime attribute A in R is fully functionally dependent on primary key.
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