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1055 Expression #1 of ORDER BY clause is not in GROUP BY clause and contains nonaggregated column 'amanteav_hsao1v.o.date_purchased' which is not functionally dependent on columns in GROUP BY clause; this is incompatible with sql_mode=only_full_group_by
in:
[select p.products_id, p.products_image from orders_products opa, orders_products opb, orders o, products p where opa.products_id = '3994' and opa.orders_id = opb.orders_id and opb.products_id != '3994' and opb.products_id = p.products_id and opb.orders_id = o.orders_id and p.products_status = 1 group by p.products_id order by o.date_purchased desc limit 6]