¿Qué es la desnormalización en bases de datos? ejemplo de código

Ejemplo: ¿que es la desnormalización en sql?

Denormalization is a strategy used 
on a previously-normalized database to 
increase performance. In computing, 
denormalization is the process of trying 
to improve the read performance of a database, 
at the expense of losing some write performance,
by adding redundant copies of data or by grouping data.

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