Why are CTEs Helpful?

CTEs, like database views and derived tables, improve the readability and simplicity of complicated queries, making it easier for users to create and manage them. By breaking down normally complicated searches into basic building parts that may be used—and reused, if necessary—in the rewriting of the query, the complexity is reduced. Instances of use cases include:

• Having to use a derived table more than once in the same query.
• Performing the same computation numerous times across different query components.
• Substituting views in the database.