JSON_ARRAYAGG in PostgreSQL - Examples & AI Generator

Working with JSON_ARRAYAGG in PostgreSQL can be daunting—especially if you’re switching from other databases or just starting to use PostgreSQL’s JSON functions. Remembering syntax differences and building nested aggregations slows down workflows for data analysts and engineers alike. AI2sql streamlines this entire process: Describe your intent in plain English, and instantly generate production-ready JSON_ARRAYAGG queries—no coding required.

JSON_ARRAYAGG Syntax in PostgreSQL

PostgreSQL JSON_ARRAYAGG Function

The core purpose of JSON_ARRAYAGG is to aggregate multiple row values into a single JSON array. This is invaluable when building structured API payloads or reporting formats. The basic syntax:

JSON_ARRAYAGG(expression)

• expression: The column or value you want to aggregate into a JSON array.

Unlike some databases, PostgreSQL’s JSON_ARRAYAGG returns values as a JSON array—ideal for downstream applications and analytics.

JSON_ARRAYAGG Examples You Can Generate Instantly

1. Aggregate Product Names by Category

SELECT category, JSON_ARRAYAGG(product_name) AS products
FROM products
GROUP BY category;

2. Combine Customer Emails for Each Sales Rep

SELECT sales_rep_id, JSON_ARRAYAGG(email) AS customer_emails
FROM customers
GROUP BY sales_rep_id;

3. Order Items as JSON Arrays per Order

SELECT order_id, JSON_ARRAYAGG(item_name) AS items
FROM order_items
GROUP BY order_id;

• Copy, paste, and modify these examples for your business scenario

• AI2sql lets you skip manual edits by generating ready-to-run code from your prompt

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Why Use AI2sql Instead of Manual JSON_ARRAYAGG Coding

• No coding required: Move from natural language to SQL instantly, even for multi-table aggregations

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FAQ: JSON_ARRAYAGG in PostgreSQL

What happens if my data includes NULLs?

By default, JSON_ARRAYAGG includes null elements in the resulting array. Use FILTER to skip them if needed.

Is JSON_ARRAYAGG better than ARRAY_AGG for JSON APIs?

JSON_ARRAYAGG returns a proper JSON array, which is directly serializable—preferred for API responses, unlike ARRAY_AGG.

Can I nest JSON objects in the aggregation?

Yes—combine JSON_BUILD_OBJECT with JSON_ARRAYAGG for advanced structures:

SELECT order_id, JSON_ARRAYAGG(JSON_BUILD_OBJECT('item', item_name, 'qty', quantity)) AS items
FROM order_items
GROUP BY order_id;

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