Question

我在sql server中进行了以下权重计算，即如果任何权重字段为NULL显示＆＃39; NMI＆＃39;否则加权。下面显示的所有权重字段都是nvarchar数据类型，例如[TIREWGHT],[WHLWGHT],[VALVEWGHT],[BOMPART1WGHT],[BOMPART2WGHT],[BOMPART3WGHT],[BOMPART4WGHT],[BOMPART5WGHT]

这是我想在计算中使用的条件

if ([BOM-TIRE]  IS NOT NULL  AND T1.[TIREWGHT] IS NULL) OR 
([BOM-WHEEL] IS NOT NULL AND T1.[WHLWGHT] IS NULL  ) OR 
([BOM-VALVE] IS NOT NULL AND [VALVEWGHT] IS NULL) OR 
([BOM-PART 1] IS NOT NULL AND [BOMPART1WGHT] IS NULL) OR 
([BOM-PART 2] IS NOT NULL AND [BOMPART2WGHT] IS NULL) OR 
([BOM-PART 3] IS NOT NULL AND [BOMPART3WGHT] IS NULL) OR
([BOM-PART 4] IS NOT NULL AND [BOMPART4WGHT] IS NULL) OR
([BOM-PART 5] IS NOT NULL AND [BOMPART5WGHT] IS NULL)  then display `NMI`
otherwise [TIREWGHT]+[WHLWGHT]+[VALVEWGHT]+[BOMPART1WGHT]+[BOMPART2WGHT],[BOMPART3WGHT]+[BOMPART4WGHT]+[BOMPART5WGHT] .

注意：NMI代表需要更多信息

我尝试了体重计算

UPDATE T1
SET [WGHT] = convert (float,    T1.[TIREWGHT]) + 
             convert (float,     T1.[WHLWGHT]) + 
             convert (float,   T1.[VALVEWGHT]) +
             convert (float, T1.[BOMPART1WGHT])+ 
             convert (float, T1.[BOMPART2WGHT])+ 
             convert (float, T1.[BOMPART3WGHT])+ 
             convert (float, T1.[BOMPART4WGHT])+ 
             convert (float, T1.[BOMPART5WGHT])

我尝试使用CASE，但我得到了

错误转换错误

示例数据

[TIREWGHT]  [WHLWGHT]   [VALVEWGHT]  [BOMPART1WGHT]  [BOMPART2WGHT]  [BOMPART3WGHT]   [BOMPART5WGHT]     [BOMPART5WGHT]
143         33           NULL             2.8              2.8           2.8            2.8                  2.8

谢谢。

Answer 1

听起来你的目标是在某些情况下同一列返回VARCHAR值（＆＃39; NMI＆＃39;），在其他情况下返回数值（或FLOAT）值。你不应该这样做。

相反，当一个或多个列包含空值时，创建第二列以返回NMI值。

根据您的具体需求，它可能看起来像这样：

SELECT [WGHT] = convert (DECIMAL(10,4),    ISNULL(T1.[TIREWGHT],0)) + 
         convert (DECIMAL(10,4),     ISNULL(T1.[WHLWGHT],0)) + 
         convert (DECIMAL(10,4),   ISNULL(T1.[VALVEWGHT],0)) +
         convert (DECIMAL(10,4), ISNULL(T1.[BOMPART1WGHT],0))+ 
         convert (DECIMAL(10,4), ISNULL(T1.[BOMPART2WGHT],0))+ 
         convert (DECIMAL(10,4), ISNULL(T1.[BOMPART3WGHT],0))+ 
         convert (DECIMAL(10,4), ISNULL(T1.[BOMPART4WGHT],0))+ 
         convert (DECIMAL(10,4), ISNULL(T1.[BOMPART5WGHT],0)),
[FulfillsCriteria] = CASE 
    WHEN TIREWGHT IS NULL OR 
        WHLWGHT  IS NULL OR 
        VALVEWGHT IS NULL OR 
        BOMPART1WGHT IS NULL OR 
        BOMPART2WGHT IS NULL OR 
        BOMPART3WGHT IS NULL OR 
        BOMPART4WGHT IS NULL OR 
        BOMPART5WGHT IS NULL
    THEN 'NMI'
    ELSE '' END

Answer 2

要将nvarchar转换为数字并将其保存在nvarchar字段中，请使用cast

示例：

declare @a NVARCHAR(100), @b NVARCHAR(100), @c NVARCHAR(100), @d NVARCHAR(100)
SET @a = '100'
SET @b = '200'
SET @c = NULL

Select @d = CAST(@a as float)+ CAST(@b as float)+  CAST(ISNULL(@c,0) as float);
select @d;

ISNULL将处理您的NULL

如何在nvarchar字段

2 个答案: