我必须根据可以为空的值选择相应的列以进行联接。详细地：

SELECT shoporders.orderid, 
   shopaddresses.companyname, 
   shopaddresses.firstname, 
   shopaddresses.lastname, 
   shopaddresses.address1,  
FROM   shoporders 
   INNER JOIN shopaddresses 
           ON shoporders.InvoiceAddressId = shopaddresses.addressid
where orderid = 110
order by shoporders.createddate desc

如果shoporders.InvoiceAddressId为null，那么我必须使用shoporders.DeliveryAddressId

有什么线索吗？

提前致谢