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Hi Harvey,

tested this:

SELECT COALESCE ( `User`, 'Empty' ) AS `User`, COUNT( `ID` ) FROM `test`.`User` AS `User` GROUP BY `User`

You don't need to change the alias for `Location` to `Loc`.
I could save this, open this to edit in GUI, execute it - no Problem with direct connection on MariaDB.

When trying the same with MariaDB and JDBC I will get:
Column 'User' in group statement is ambiguous at /home/buildslave/source/libo-core/connectivity/source/drivers/jdbc/SQLException.cxx:35

Changing the code to
SELECT COALESCE ( `User`, 'Empty' ) AS `Us`, COUNT( `ID` ) FROM `test`.`User` AS `User` GROUP BY `User`
and the query will work. Won't be detroyed also through GUI.

GUI will destroy the query when setting
GROUP BY `Us` instead of GROUP BY `User`. Seems it hat problems using the alias for a group. But the alias isn't needed there, so set `Location` instead of `Loc`



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