select t1.Nums1-t2.Nums2 Nums,t1.PRODUCTS_ID,t3.PRODNAME from
(select sum(num) Nums1,PRODUCTS_ID from jxc_t_outbound_detailed GROUP BY PRODUCTS_ID
) t1
left join (select sum(num) Nums2,PRODUCTS_ID from jxc_t_outbound_revise_detailed GROUP BY PRODUCTS_ID
) t2 on t1.PRODUCTS_ID=t2.PRODUCTS_ID
LEFT JOIN jxc_t_products t3 ON t1.PRODUCTS_ID=t3.ID
LEFT JOIN jxc_t_outbound_revise t4 ON t1.PRODUCTS_ID=t4.ID
WHERE LIMIT 10 order by TIME
select left(TIME,4) from jxc_t_outbound_revise (本年)
select left(TIME,7) from jxc_t_outbound_revise (本月)
怎么写才能使上面的语句加入where 加入条件按本年,本月呢?他们怎么连接起来?