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MySQL error code

MySQL error 3029

MySQL server error 3029 is ER_AGGREGATE_ORDER_NON_AGG_QUERY, reported with SQLSTATE HY000.

Expression #%u of ORDER BY contains aggregate function and applies to the result of a non-aggregated query
Error3029
NameER_AGGREGATE_ORDER_NON_AGG_QUERY
SQLSTATEHY000
GroupServer errors

Source: MySQL 8.4 Error Reference