LISTAGG in Oracle - Examples & AI Generator

Oracle’s LISTAGG function allows you to concatenate values from multiple rows into a single, comma-separated string—a powerful tool, but one that comes with advanced syntax and ordering requirements. For SQL developers, analysts, and engineers, keeping track of different LISTAGG Oracle syntax can slow down productivity. AI2sql solves this instantly: describe your result and get a production-ready LISTAGG query in 10 seconds, no coding required.

LISTAGG Syntax in Oracle

Basic Structure

LISTAGG(column_name, 'delimiter') WITHIN GROUP (ORDER BY sort_column)

  • column_name: The column whose values you want to concatenate.

  • delimiter: The string to separate values (often a comma).

  • WITHIN GROUP: Required for ordering in Oracle.

Unlike some databases, Oracle mandates WITHIN GROUP (ORDER BY …) with LISTAGG.

LISTAGG Examples You Can Generate Instantly

  • Concatenate customer cities per country
SELECT country, 
       LISTAGG(city, ', ') WITHIN GROUP (ORDER BY city) AS cities 
FROM customers 
GROUP BY country;
  • List product names in each order
SELECT order_id,
       LISTAGG(product_name, '; ') WITHIN GROUP (ORDER BY product_name) AS products
FROM order_items
GROUP BY order_id;
  • Summarize employee names by department
SELECT department_id,
       LISTAGG(employee_name, ' | ') WITHIN GROUP (ORDER BY employee_name) AS all_employees
FROM employees
GROUP BY department_id;

Generate LISTAGG queries in 10 seconds with AI2sql

Why Use AI2sql Instead of Manual LISTAGG Coding

  • No coding required—just describe your goal in plain language.

  • Instant generation—avoid Oracle-specific syntax errors and complex ordering rules.

  • Relevant across databases—AI2sql adapts LISTAGG-style queries for other SQL engines as well.

  • Trusted by 50,000+ users across 80+ countries for fast, accurate query creation.

For speed and reliability, Try AI2sql Generator or Learn LISTAGG in more depth.

Frequently Asked Questions about LISTAGG in Oracle

  • How does LISTAGG handle long output strings in Oracle?
    Starting from Oracle 12.2, specify ON OVERFLOW TRUNCATE to manage overflows gracefully.

  • Can I use DISTINCT with LISTAGG in Oracle?
    Oracle’s native LISTAGG does not directly support DISTINCT, but you can use a subquery to deduplicate values before aggregation.

  • What happens if I omit WITHIN GROUP in Oracle’s LISTAGG?
    Oracle requires the WITHIN GROUP (ORDER BY …) clause. Omitting it results in a syntax error.

Simplify Oracle LISTAGG forever: Generate your first query in seconds—start with AI2sql now!

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