A Database Error Occurred

Error Number: 1055

Expression #4 of SELECT list is not in GROUP BY clause and contains nonaggregated column 'jx3.g_item_drops.ParentClassID' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by

SELECT `ItemType`, `ItemIndex`, `Min`, `ParentClassID`, `ClassID`, `Level`, `DropRate` FROM (`g_item_drops`) WHERE `ItemType` = 5 AND `ItemIndex` = '7957' AND `Min` = 287 GROUP BY `Level` LIMIT 200