Advanced SQLAdvanced11 min

Common Table Expressions (CTE)

Break complex logic into understandable steps with WITH clauses.

What You Will Learn

CTEs improve readability in multi-step transformations.
Reuse intermediate datasets inside one query.
Good naming for CTEs makes maintenance much easier.

Sample SQL

WITH paid_orders AS (
  SELECT user_id, total_amount
  FROM orders
  WHERE status = 'paid'
)
SELECT user_id, SUM(total_amount) AS revenue
FROM paid_orders
GROUP BY user_id;

Next Step

Try rewriting this query in your own schema, then use our tools to format and refine it.

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