怎么把下面sql server转换成oracle代码,
CREATE VIEW "YGQ"."REPORT_IMAGE_SALEAMT_GOOD" AS SELECT top 10 trunc(SCM_S_BILL.BILLDATE,'month') AS [Month], PUB_C_Product.NAME as [Salesperson],sum(SCM_S_BILL.BILLAMT) AS Sales
FROM SCM_S_BILL,PUB_C_Product,SCM_S_BILLD
WHERE
SCM_S_BILL.BILLID=SCM_S_BILLD.BILLID and
SCM_S_BILLD.ProductID=PUB_C_Product.ProductID and
SCM_S_BILL.BILLDATE between '9/1/2002'and '9/30/2002' and
SCM_S_BILL.CANCELED=0 and
SCM_S_BILL.WDATE= SCM_S_BILL.ADATE
GROUP BY trunc(SCM_S_BILL.BILLDATE,'month'),PUB_C_Product.NAME
order by Sales desc