Data Engineering Associate with Databricks Practice Exam

What are CTEs in SQL?

1. Common Type Extensions

2. Common Table Expressions

3. Conditional Table Evaluations

4. Concurrent Transaction Executions

The correct answer is: Common Table Expressions

The correct answer is Common Table Expressions, often abbreviated as CTEs. CTEs are a powerful feature in SQL that allows you to create temporary result sets that can be referenced within a SELECT, INSERT, UPDATE, or DELETE statement. A CTE improves the readability and organization of complex queries by allowing you to define a result set and give it a name that can be used later in the query, enabling better structuring and modularization of SQL code. CTEs can also serve as a recursive query mechanism, which is useful for dealing with hierarchical data. By utilizing CTEs, you can break down a query into simpler parts, making it easier to understand and maintain. Overall, CTEs provide a flexible way to encapsulate logic and reuse elements within the same query context.