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ARRAY_AGG in Oracle - Examples & AI Generator

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ARRAY_AGG in Oracle - Examples & AI Generator

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.
AI2sql eliminates the guesswork—simply type your query in natural language and get production-ready Oracle SQL in seconds, no manual coding required.

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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Why Use AI2sql Instead of Manual ARRAY_AGG Coding

  • Zero syntax memorization: Instantly adapt across databases without needing to recall Oracle quirks.

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Skip the documentation search and manual coding. Try AI2sql Generator or Learn ARRAY_AGG in detail.

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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