ARRAY_AGG in Oracle - Examples & AI Generator

The ARRAY_AGG function in Oracle lets you collect column values into a single array—especially useful for aggregating rows into lists or arrays by group. But, Oracle’s ARRAY_AGG syntax differs from other databases, making it hard to remember the nuances, especially if you work across SQL dialects.
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ARRAY_AGG Syntax in Oracle

Oracle ARRAY_AGG syntax lets you aggregate values into an array, supporting both distinct and order specifications:

ARRAY_AGG([DISTINCT] expr [ORDER BY ... ])

• DISTINCT: Remove duplicate values

• ORDER BY: Control element order inside the aggregate array

Oracle difference: Unlike PostgreSQL or SQL Server, Oracle’s ARRAY_AGG often returns a VARRAY or a nested collection instead of a simple delimited string.

ARRAY_AGG Examples You Can Generate Instantly

Example 1: Combine Orders by Customer

SELECT customer_id, ARRAY_AGG(order_id ORDER BY order_date) AS order_list
FROM orders
GROUP BY customer_id;

Use case: Get a list of all order IDs per customer, ordered by order date.

Example 2: Aggregate Product Names per Order

SELECT order_id, ARRAY_AGG(product_name) AS products_ordered
FROM order_items
GROUP BY order_id;

Use case: Find every product in each order for a fulfillment dashboard.

Example 3: Unique Countries per Sales Rep

SELECT sales_rep_id, ARRAY_AGG(DISTINCT customer_country) AS countries_sold_in
FROM sales
GROUP BY sales_rep_id;

Use case: Quickly view all unique countries that each sales rep has operated in.

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FAQ: ARRAY_AGG in Oracle

• Can ARRAY_AGG return custom data types in Oracle?
  Yes, you can aggregate expressions of supported column types, but output is a collection (often VARRAY); check your PL/SQL version.

• Does ARRAY_AGG support ordering?
  Yes; use ORDER BY within the function.

• How is Oracle ARRAY_AGG different from LISTAGG?
  LISTAGG returns a delimited string; ARRAY_AGG outputs an array collection.

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