请问这个是什么意思：select 订单号，sum（单价*数量） as 总金额 from order_detail GROUP by 订单号 into CURSO

select 订单号，sum（单价*数量） as 总金额 from order_detail GROUP by 订单号 into CURSOR LS
select Q.客户号，Q.订单号，Q.订购日期，LS.总金额 from order_list Q,LS where Q.订单号=LS.订单号 order by LS.总金额 DESC into table od_new