Question: Provide explaination and examples about (1) definition of functional dependency between columns, for instance, in what condition a column is said to be functionally dependent

Provide explaination and examples about (1) definition of functional dependency between columns, for instance, in what condition a column is said to be functionally dependent on another, and (2) 1NF, 2NF, and 3NF, for example, in what condition a table is 2NF but not 3NF?

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