Coding⏱️ 1 min read📅 2026-06-03

How to Fix: UPDATE multiple tables in MySQL using LEFT JOIN

Update multiple tables in MySQL using LEFT JOIN with the UPDATE statement.

Quick Answer: Use the following syntax: UPDATE T1 SET column1 = value1, column2 = value2 FROM (SELECT T1.* FROM T1 LEFT JOIN T2 ON T1.id = T2.id WHERE T2.id IS NULL) AS subquery;

📋 Table of Contents

  1. ✅ Solution
  2. ✨ Why This Works

To update multiple tables in MySQL using a LEFT JOIN, you can use the following syntax:

✅ Solution

  • Use the `UPDATE` statement with a `LEFT JOIN` clause:

Example Syntax

  1. sql
  2. UPDATE T1 JOIN T2 ON T1.id = T2.id SET T1.field1 = 'new_value' WHERE T1.id IN (SELECT id FROM T2)

✨ Why This Works

The `IN` clause allows you to reference the `id` column in both tables, ensuring that only rows with a match in both tables are updated.

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