what is redundancy and in what way it's removed in SQL

Question

Explain Redundancy

Answer 1

Redundancia tiene que ver con la duplicidad de los datos. Tener en varias tablas los mismos datos no es bueno ya que puede traer errores en las consultas además de ralentizar la BD. Al momento de modelar la BD lo que se hace es normalizar tu BD para prevenir por ejemplo la redundancia.

Answer 2

Ehm...I can understand English...

Answer 3

Redundancy means that there is duplication of data. e.g. if you have multiple tables are repeating the same data information. That's not good because you can generate errors in SQL queries and also causes the DB is slower.

Answer 4

At first when the database modeling what is done is a process called 'normalize' precisely to prevent redundancy. Excuse my bad english.