3368
MariaDBERRORNotableQuery ExecutionHIGH confidence
Non-aggregated column in SELECT list with GROUP BY (v2)
Production Risk
Medium — existing queries may break when ONLY_FULL_GROUP_BY is enforced.
How to reproduce
trigger — this will error
trigger — this will error
SET sql_mode = 'ONLY_FULL_GROUP_BY'; SELECT name, COUNT(*) FROM t GROUP BY id;
expected output
ERROR 3368 (HY000): Expression #1 of SELECT list is not in GROUP BY clause.
Fix
Use ANY_VALUE() for non-deterministic column
Use ANY_VALUE() for non-deterministic column
SELECT ANY_VALUE(name), COUNT(*) FROM t GROUP BY id;
Why this works
ANY_VALUE() explicitly acknowledges that any value from the group is acceptable.
What not to do
✕
Sources
Official documentation ↗
MySQL 8.0 — 3368 ER_WRONG_FIELD_WITH_GROUP_V2
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