oracle 子查询用法

select tor.BACKMONEYSTATUS,tp.PRODUCTID,tpmd.DISCOUNTDETAILID
	,SUM (DECODE (tor.BACKMONEYSTATUS, null, tpmd.ACTUAL_FEE,0, tpmd.ACTUAL_FEE, 0)) unback_many --商品特定支付方式 未回款金额
	,SUM (DECODE (tor.BACKMONEYSTATUS, 1, tpmd.ACTUAL_FEE, 0)) backed_many --商品特定支付方式 已回款金额
	,(
		select sum(tpmd1.ACTUAL_FEE) 
		from t_orders tor1,T_ORDERSDETAIL tord1,T_PAYMENT_DETAIL tpmd1 
		WHERE tor1.ORDERSID=tord1.ORDERSID and tord1.PRODUCTID=tp.productid 
			and tord1.ORDERSID=tpmd1.ORDER_ID and tor1.BACKMONEYSTATUS <>1
		group by tord1.PRODUCTID
	) unback_many_all --商品未回款的总金额
	,(
		select sum(tpmd2.ACTUAL_FEE) 
		from t_orders tor2,T_ORDERSDETAIL tord2,T_PAYMENT_DETAIL tpmd2 
		WHERE tor2.ORDERSID=tord2.ORDERSID and tord2.PRODUCTID=tp.productid 
			and tord2.ORDERSID=tpmd2.ORDER_ID and tor2.BACKMONEYSTATUS =1
		group by tord2.PRODUCTID
	) backed_many_all --商品已回款的总金额
	
from t_orders tor,T_ORDERSDETAIL tord,T_PAYMENT_DETAIL tpmd,T_PRODUCT tp
WHERE  tor.ORDERSID=tord.ORDERSID and tord.PRODUCTID=tp.PRODUCTID 
	and tor.ORDERSID=tpmd.ORDER_ID
	--and tor.BACKMONEYDATE --回款时间
	and tor.FCONFIGID in(1) --城市
	--and tp.BEGINDATE --大于开始时间
	--and tp.ENDDATE --小于结束时间
	and tp.PRODUCTID=23178 
group by tor.BACKMONEYSTATUS,tp.PRODUCTID,tpmd.DISCOUNTDETAILID;