创建一个自定义列

Question

我正在尝试创建一个自定义列，该列是2个现有列的乘积。

(
  select
    omdDeliveryQty * omlUnitPriceBase AS 'Value'
) *
from
  SalesOrderDeliveries
  Left Outer Join SALESORDERLINES On OMDSALESORDERID = OMLSALESORDERID
  And OMDSALESORDERLINEID = OMLSALESORDERLINEID

Answer 1

您可能想要：

select
  *,
  d.omdDeliveryQty * l.omlUnitPriceBase AS 'Value'
from SalesOrderDeliveries d
left outer join SALESORDERLINES l
  on d.OMDSALESORDERID = l.OMLSALESORDERID 
 and d.OMDSALESORDERLINEID = l.OMLSALESORDERLINEID

别忘了为每个表添加别名（我添加了d和l），以使查询更易于阅读和调试。