1140 - In aggregated query without GROUP BY, expression #2 of SELECT list contains nonaggregated column 'bangonbanners_bangonba_db.osc_categories.categories_id'; this is incompatible with sql_mode=only_full_group_by

select count(*) as total, categories_id, parent_id from osc_categories where parent_id = '21'

[TEP STOP]