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What is "normalization"? "Denormalization"? Why do you sometimes want to denormalize?

Normalizing data means eliminating redundant information from a table and organizing the data
so that future changes to the table are easier. Denormalization means allowing redundancy in a
table. The main benefit of denormalization is improved performance with simplified data retrieval
and manipulation. This is done by reduction in the number of joins needed for data processing.
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