Coding⏱️ 2 min read📅 2026-06-03

How to Fix: How to do an update + join in PostgreSQL?

Update and join in PostgreSQL

Quick Answer: Use the `JOIN` clause before the `UPDATE` statement, like this: `UPDATE vehicles_vehicle v JOIN shipments_shipment s ON v.shipment_id = s.id SET v.price = s.price_per_vehicle;

📋 Table of Contents

  1. 🛑 Correct Syntax
  2. 🚀 How to Resolve This Issue
  3. ✨ Wrapping Up

To update a table in PostgreSQL while joining another table, you need to use the `UPDATE` statement with a subquery that includes an `INNER JOIN`. The syntax for this is as follows:

🛑 Correct Syntax

  • The correct syntax is: `UPDATE vehicles_vehicle v SET v.price = (SELECT price_per_vehicle FROM shipments_shipment s WHERE s.id = v.shipment_id);`

🚀 How to Resolve This Issue

Method 1: Using a Subquery

  1. Step 1: Replace the `JOIN` clause with an `INNER JOIN` subquery that selects the required column (`price_per_vehicle`) from the joined table.

✨ Wrapping Up

In PostgreSQL, using a subquery to update a table while joining another table is a common and effective solution. By following the correct syntax and method, you can efficiently update your data while maintaining data integrity.

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