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Learn how to disable ONLY_FULL_GROUP_BY in MySQL to avoid strict grouping constraints in your SQL queries.
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How to Disable ONLY_FULL_GROUP_BY in MySQL

In MySQL, the ONLY_FULL_GROUP_BY mode is part of the SQL mode configurations that determine how MySQL processes input data and interprets SQL queries. When enabled, this mode enforces strict SQL standards that require each selected column in a SELECT statement to either be in the GROUP BY clause or be used within an aggregate function like SUM, MIN, MAX, etc. This helps catch potentially problematic queries but can be overly restrictive for some use cases.

If you find yourself in need of disabling the ONLY_FULL_GROUP_BY mode, follow the steps below:

Steps to Disable ONLY_FULL_GROUP_BY

Step 1: Check the Current SQL Mode
First, you need to check the current SQL mode settings. This can be done using the following SQL query:

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This will give you the existing SQL mode settings.

Step 2: Modify SQL Mode
Next, you need to remove ONLY_FULL_GROUP_BY from the returned string of modes. Here is how you can do it:

Remove ONLY_FULL_GROUP_BY from the list.

Apply the new SQL mode excluding ONLY_FULL_GROUP_BY.

You can achieve this with the following SQL commands:

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Step 3: Verification
Finally, verify that the mode has been updated by running:

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Ensure that ONLY_FULL_GROUP_BY is no longer part of the SQL mode list.

Important Notes

Persistence: Changes made using SET GLOBAL only persist until the MySQL server is restarted. For a permanent change, the MySQL configuration file (my.cnf or my.ini) needs to be edited.

Permissions: Modifying global settings requires administrative privileges. Ensure you have the necessary permissions before attempting these changes.

By following these steps, you can successfully disable the ONLY_FULL_GROUP_BY mode in MySQL and navigate around the strict grouping constraints that it enforces.