CTE in Oracle - Examples & AI Generator

Oracle's Common Table Expressions (CTEs) are powerful for organizing complex SQL, but the syntax can be tricky—especially if you work across databases. From recursive trees to multi-step data transformations, recalling precise Oracle CTE syntax often slows you down. AI2sql eliminates manual coding: generate production-ready CTE queries from natural language in just 10 seconds. No Oracle memorization, just results.

CTE Syntax in Oracle

Standard Oracle CTE Structure

WITH cte_name AS (
    SELECT ...
)
SELECT ...
FROM cte_name;

• Oracle uses WITH to define CTEs at the start of the query.

• Multiple CTEs can be chained with commas: WITH cte1 AS (...), cte2 AS (...)

• Oracle supports recursive CTEs for hierarchical data.

CTE Examples You Can Generate Instantly

CTEs help solve business problems with clean, readable SQL. Here are practical CTE Oracle examples—copy, paste, or generate your own instantly!

1. Filter Top Customers by Order Value

WITH Top_Customers AS (
  SELECT customer_id, SUM(order_amount) AS total_spent
  FROM orders
  GROUP BY customer_id
  HAVING SUM(order_amount) > 10000
)
SELECT c.customer_name, t.total_spent
FROM Top_Customers t
JOIN customers c ON c.customer_id = t.customer_id;

2. Recursive CTE for Product Categories

WITH Category_Hierarchy (id, parent_id, name, level) AS (
  SELECT id, parent_id, name, 1 AS level
  FROM product_categories
  WHERE parent_id IS NULL
  UNION ALL
  SELECT pc.id, pc.parent_id, pc.name, h.level + 1
  FROM product_categories pc
  JOIN Category_Hierarchy h ON pc.parent_id = h.id
)
SELECT * FROM Category_Hierarchy WHERE level <= 3;

3. CTE for Monthly Sales Overview

WITH Monthly_Sales AS (
  SELECT TO_CHAR(order_date, 'YYYY-MM') AS sales_month, SUM(order_amount) AS total_sales
  FROM orders
  WHERE order_date >= ADD_MONTHS(TRUNC(SYSDATE, 'MM'), -5)
  GROUP BY TO_CHAR(order_date, 'YYYY-MM')
)
SELECT * FROM Monthly_Sales ORDER BY sales_month DESC;

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• No SQL required: Write queries in plain English, tailored to Oracle CTE syntax.

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FAQ: CTE in Oracle

What is the main advantage of CTEs in Oracle?

CTEs (Common Table Expressions) make complex Oracle SQL readable, reusable, and easier to maintain—especially for subqueries or recursive logic.

Does Oracle support recursive CTEs?

Yes, Oracle supports recursive CTEs using UNION ALL, making it ideal for hierarchy queries (e.g., org charts, category trees).

How does AI2sql handle Oracle CTE differences?

AI2sql automatically generates valid Oracle CTE syntax from your instructions, accounting for database-specific features and quirks.

Ready to simplify CTEs? Generate Your First Query Now with AI2sql - AI SQL Generator.