CTE Pipeline

How can we build a multi-step SQL transformation using CTEs?

Advanced⏱ 3 Minutes⭐ 1210 XP

🤔 THE QUESTION

How can we build a multi-step SQL transformation using CTEs?

💡 WHAT IS IT?

Chaining sequential CTEs creates a multi-stage data pipeline (filtering → aggregation → final thresholding).

🎯 WHAT IS IT USED FOR?

Production ELT pipelines, dbt model transformations, warehouse layer staging.

💻 EXAMPLE

WITH active_employees AS (
    SELECT *
    FROM employees
    WHERE status = 'Active'
),
department_stats AS (
    SELECT
        department_id,
        COUNT(*) AS employee_count,
        AVG(salary) AS average_salary
    FROM active_employees
    GROUP BY department_id
)
SELECT *
FROM department_stats
WHERE employee_count > 5
AND average_salary > 80000;

🎯 Mission Objectives

Practice typing production-grade SQL code for CTE Pipeline.

✓ Multi-step CTE pipeline
✓ Chained data transformation
✓ Production data modeling
✓ Clean SQL design

🚀 Start Mission

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