Denormalization in sql

What is denormalization in 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.

Source: en.wikipedia.org

Denormalization in sql example

Denormalization is used to combine multiple tables in order to reduce
the time required to perform queries.

Source: grepper.com

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