MySQL 3066

This error occurs when an aggregate function is used in an ORDER BY clause in a SELECT statement.

How It Affects Your App

The error ER_AGGREGATE_IN_ORDER_NOT_SELECT indicates that an aggregate function has been used in an ORDER BY clause. This can cause the application to return incorrect results, as the ORDER BY clause is used to sort the data before the aggregate function is applied. This can lead to incorrect calculations and incorrect data being returned to the user. It can also lead to unexpected behavior in the application, as the data is not being sorted correctly. This can cause confusion and frustration for the user.

How To Fix

1. Check the error log for the MySQL 3066 error:
$ tail -f /var/log/mysql/error.log
2. Check the MySQL configuration file for the correct port number:
$ grep port /etc/mysql/my.cnf
3. Restart the MySQL service to apply the changes:
$ sudo service mysql restart
4. Check the error log again to make sure the MySQL 3066 error is gone:
$ tail -f /var/log/mysql/error.log
5. Use an automated database observability tool to monitor and fix the MySQL 3066 in question. Automated database observability tools can help detect and diagnose issues quickly, as well as provide insights into the performance of the database. They can also provide alerts when certain thresholds are exceeded, allowing for proactive monitoring and maintenance of the database.

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