Coding⏱️ 2 min read📅 2026-06-03

How to Fix: MySQL - UPDATE query based on SELECT Query

Update query based on select query to link events by date-time.

Quick Answer: Use a JOIN clause to combine the two SELECT queries into one UPDATE query.

📋 Table of Contents

  1. 🔍 Why This Happens
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

To find the association between two events based on date-time, you need to join the two SELECT queries into a single UPDATE query. This can be achieved using an INNER JOIN or a LEFT JOIN depending on your requirements.

🔍 Why This Happens

  • When you use two separate SELECT queries to retrieve data from the same table, it does not automatically link the data between the two queries.

🔧 Proven Troubleshooting Steps

Method 1: Joining Tables

  1. Step 1: Use an INNER JOIN to link the two tables based on a common column, such as id or name.

Method 2: Using a LEFT JOIN

  1. Step 1: Use a LEFT JOIN to link the two tables based on a common column, such as id or name.

✨ Wrapping Up

To update the data in one table based on the results of another query, use an UPDATE statement with a JOIN clause.

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