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Tree behavior - Make this query compatible with mysql with sql_mode=only_full_group_by
Posted by: Patrick FAURE
Date: August 21, 2017 08:02AM

I would like to get all records of the same level in a tree table.
The query below works fine with old version of MySQL but does work with the version Ver 14.14 Distrib 5.7.19 with this error message:

Syntax error or access violation: 1055 Expression #1 of SELECT list is not in GROUP BY clause and contains nonaggregated column '' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

How to get this query compatible with SQL_MODE=ONLY_FULL-GROUP-BY?

Thank you the your answer and time you spend on it.

The query:

COUNT(*)-1 AS level,
ROUND ((n.rgt - n.lft - 1) / 2) AS offspring
FROM tree AS n,
tree AS p
WHERE n.lft BETWEEN p.lft AND p.rgt
GROUP BY n.lft
ORDER BY n.lft;

with sql_mode=only_full_group_by

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