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Now that we understand a little bit about what Relational Databases are and why we structure them the way we do, let’s take a higher-level look at how to think about data.

**Set Theory** was founded in 1874, and is a relatively new mathematical discipline, as compared to Algebra or Calculus.

For more history and info about the topic, check out the Wikipedia page on Set Theory

This link takes a look at Set Operations in SQL, but we’ll be covering this more in a later stage.

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