CTE Common Table Expression

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What is a CTE in SQL?
A CTE (Common Table Expression) in SQL is a temporary result set defined within the execution scope of a SELECT, INSERT, UPDATE, or DELETE statement. It simplifies complex queries by allowing you to break them into reusable subqueries that improve readability and maintainability.
Why do We Need CTE in the SQL ?
CTEs are defined using the WITH clause and can be referenced multiple times within the main SQL query. This makes CTEs a great alternative to subqueries, especially in cases where we need to perform the same operation multiple times or create recursive queries.