ARRAY_AGG in Snowflake - Examples & AI Generator

The ARRAY_AGG function in Snowflake is essential for transforming grouped SQL results into flexible array formats. Whether you need customer purchase lists or aggregated order IDs, mastering ARRAY_AGG can save hours—but remembering precise syntax across databases like Snowflake can be challenging. AI2sql streamlines this process: describe what you need, and get a production-ready ARRAY_AGG query in under 10 seconds, no coding required.

ARRAY_AGG Syntax in Snowflake

Basic Syntax

ARRAY_AGG([DISTINCT] <expr>) [WITHIN GROUP (ORDER BY <order_expr>)]

• <expr>: Column to aggregate into an array

• WITHIN GROUP: (Optional) Specifies array element order

• DISTINCT: Eliminates duplicates within groups

Snowflake-Specific Notes

• Returns a single ARRAY per group

• Supports ordering and nesting for advanced cases

ARRAY_AGG Examples You Can Generate Instantly

1. Aggregate customer emails by country

SELECT country, ARRAY_AGG(email) AS emails_by_country
FROM customers
GROUP BY country;

2. List product names per order, ordered alphabetically

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

3. Collect unique employee roles for each department

SELECT department_id, ARRAY_AGG(DISTINCT role) AS unique_roles
FROM employees
GROUP BY department_id;

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FAQ: ARRAY_AGG in Snowflake

• Can I use ARRAY_AGG with DISTINCT and ORDER BY together in Snowflake?
  Yes. Combine both for deduplicated, ordered arrays: ARRAY_AGG(DISTINCT col WITHIN GROUP (ORDER BY col DESC)).

• What data types does ARRAY_AGG support?
  Any Snowflake-supported data types, including strings, numbers, and even complex objects.

• How does ARRAY_AGG differ from LISTAGG in Snowflake?
  ARRAY_AGG returns arrays; LISTAGG returns concatenated strings.

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