LISTAGG in Snowflake - Examples & AI Generator

Snowflake's LISTAGG function is a powerful SQL tool for string aggregation, but its detailed options—like handling duplicates, ordering, and managing overflow—make it tricky to master. Whether you're new to Snowflake LISTAGG syntax or switching from another database, writing the perfect query can slow you down. AI2sql lets you skip manual coding—and never worry about memorizing complex LISTAGG variations. Enter your intent in plain English and get a production-ready query within 10 seconds. For data analysts and SQL developers, AI2sql is the instant route to accurate, database-specific results, every time.

LISTAGG Syntax in Snowflake

LISTAGG in Snowflake concatenates grouped column values into a single, delimited string. Key syntax differences:

• Delimiter: Required between values.

• WITHIN GROUP (ORDER BY ...): Specify sort order inside groups.

• ON OVERFLOW: Control overflow behavior (Snowflake supports 'TRUNCATE WITH COUNT').

LISTAGG(<column>, '<delimiter>') WITHIN GROUP (ORDER BY <column>

LISTAGG Examples You Can Generate Instantly

1. Concatenate Order IDs by Customer

SELECT customer_id, 
       LISTAGG(order_id, ', ') WITHIN GROUP (ORDER BY order_id) AS order_list
FROM orders
GROUP BY customer_id;

Use case: View every customer's order IDs as a single field, sorted.

2. Aggregate Product Names per Category

SELECT category, 
       LISTAGG(product_name, ' | ') WITHIN GROUP (ORDER BY product_name) AS all_products
FROM products
GROUP BY category;

Use case: Quick summary of all products in each category, pipe-separated.

3. Show Top Cities per Sales Rep (with Overflow Handling)

SELECT sales_rep_id,
       LISTAGG(city, '; ') WITHIN GROUP (ORDER BY sales DESC) 
         ON OVERFLOW TRUNCATE WITH COUNT AS city_list
FROM sales
GROUP BY sales_rep_id;

Use case: Limit concatenated city lists to avoid excessively long strings—ideal for dashboard reporting.

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FAQ: LISTAGG in Snowflake

• Can I control value order with LISTAGG in Snowflake?
  Yes. Use WITHIN GROUP (ORDER BY ...) to sort values before concatenation.

• How does Snowflake handle long strings with LISTAGG?
  Use ON OVERFLOW TRUNCATE WITH COUNT to prevent errors from exceeding the string length limit.

• Are NULL values ignored in LISTAGG?
  Yes, NULLs are skipped—only non-null values are concatenated.

Conclusion

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