How to Resolve MySQL Error #1140: 'Mixing of GROUP columns' in Remote SQL Queries?

Handling MySQL Error #1140: "Mixing of GROUP columns" in a Remote Environment

When encountering the error "MySQL #1140 - Mixing of GROUP columns (MIN(), MAX(), COUNT(),...) with no GROUP columns is illegal if there is no GROUP BY clause," it indicates that your SQL query attempts to mix grouped columns (e.g., COUNT()) with non-grouped columns (e.g., nid) without using a GROUP BY clause.

In your specific case, the issue arises in the following SQL query:

SELECT COUNT(node.nid),
       node.nid AS nid,
       node_data_field_update_date.field_update_date_value AS node_data_field_update_date_field_update_date_value
FROM node node
LEFT JOIN content_type_update node_data_field_update_date ON node.vid = node_data_field_update_date.vid
WHERE node.type IN ('update')
ORDER BY node_data_field_update_date_field_update_date_value DESC

To resolve the issue, you have two options:

1. Disable ONLY_FULL_GROUP_BY: This MySQL server setting requires that all selected columns (other than aggregate functions) be included in the GROUP BY clause. You can disable it by setting ONLY_FULL_GROUP_BY to 0 in the MySQL configuration.
2. Add GROUP BY clause: Alternatively, you can explicitly group the results by the columns used in the selection:

SELECT COUNT(node.nid),
       node.nid AS nid,
       node_data_field_update_date.field_update_date_value AS node_data_field_update_date_field_update_date_value
FROM node node
LEFT JOIN content_type_update node_data_field_update_date ON node.vid = node_data_field_update_date.vid
WHERE node.type IN ('update')
GROUP BY nid, node_data_field_update_date_field_update_date_value
ORDER BY node_data_field_update_date_field_update_date_value DESC

By incorporating one of these solutions, you can address the "Mixing of GROUP columns" error and successfully execute the SQL query in the remote environment.

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