当值MINUS Null时显示Value而不是Null

Question

SELECT --PartnerId,
          ScheLineDesc,
          PartNumber,
          TotalQtyOrder,
          TotalShippedQty,
          TotalQtyOrder - TotalShippedQty AS TotalBalanceToShip

当TotalShippedQty为Null时，我需要在TotalBalanceToShip中显示TotalQtyOrder。现在，我只会得到Null。

Answer 1

使用coalesce()函数

select ScheLineDesc,
          PartNumber,
          TotalQtyOrder,
          TotalShippedQty,
           coalesce(TotalQtyOrder, 0) - coalesce(TotalShippedQty, 0) as TotalBalanceToShip

Answer 2

您可以使用Isnull或NVL函数检查值并将其替换为null