具有字母数字值的列的SQL SUM

Question

我想获取字母数字列的总和。我想添加数字值，如果不是数字，则返回列值。我所做的是添加一个看起来像这样的CASE WHEN

, CASE WHEN intAllocatedResourceperDivision NOT IN ('CL','HS','HV','ML','SL','VL','HC','S','*') THEN CAST(SUM(ISNULL(CAST(intAllocatedResourceperDivision AS DECIMAL),0.00)) AS nvarchar(250)) ELSE intAllocatedResourceperDivision END intAllocatedResourceperDivision

因此，我假定将添加所有数值，并且如果值位于('CL','HS','HV','ML','SL','VL','HC','S','*')中，则将按原样返回

但是我得到

将数据类型nvarchar转换为数字时出错。

Answer 1

似乎您的SUM聚合不正确。仅在case语句中的条件为true时才求和。试试这个：

SUM(case when intAllocatedResourceperDivision NOT IN ('CL','HS','HV','ML','SL','VL','HC','S','*') THEN intAllocatedResourceperDivision else 0 end)

[如果您不知道非数值的确切组合，可以使用ISNUMERIC函数（假设您使用的是SQL Server）来测试该值是否为数字，如果为0，则指定为0并非如此，汇总最终结果。

SUM(case when ISNUMERIC(intAllocatedResourceperDivision) = 1 then intAllocatedResourceperDivision else 0 end)

要汇总数值并且也保持非数值，可以这样使用联合查询：

select
    cast(SUM(cast(intAllocatedResourceperDivision as decimal(18,2))) as varchar)
from
    YOUR_TABLE
where
    ISNUMERIC(intAllocatedResourceperDivision) = 1

UNION ALL

select
    intAllocatedResourceperDivision
from
    YOUR_TABLE
where
    ISNUMERIC(intAllocatedResourceperDivision) = 0

Answer 2

这看起来像SQL Server语法。我建议使用TRY_CONVERT()：

TRY_CONVERT(DECIMAL, intAllocatedResourceperDivision) as intAllocatedResourceperDivision

Answer 3

尝试一下：

select 'CL' as intAllocatedResourceperDivision into #tmp
union select 'HS'union select 'HV'union select 'ML'union select 'SL'union select 'VL'union select 'HC'union select 'S'union select '*'union select '1'union select '4'

select CAST(SUM(ISNULL(CAST(intAllocatedResourceperDivision AS DECIMAL),0.00)) AS nvarchar(250)) as intAllocatedResourceperDivision
from #tmp where intAllocatedResourceperDivision NOT IN ('CL','HS','HV','ML','SL','VL','HC','S','*')
union 
select intAllocatedResourceperDivision
from #tmp where intAllocatedResourceperDivision IN ('CL','HS','HV','ML','SL','VL','HC','S','*')

Answer 4

[cast您的为varchar，以匹配您的IN运算符值。

,CASE WHEN cast(intAllocatedResourceperDivision as varchar(2)) 
    NOT IN ('CL','HS','HV','ML','SL','VL','HC','S','*') 
 THEN CAST(SUM(ISNULL(CAST(intAllocatedResourceperDivision AS DECIMAL),0.00)) as nvarchar(250)) 
 ELSE cast(intAllocatedResourceperDivision as nvarchar(250))  END intAllocatedResourceperDivision

或您可以使用try_cast()

select case when try_cast(intAllocatedResourceperDivision  as int) = 0 
   then CAST(SUM(ISNULL(CAST(intAllocatedResourceperDivision AS DECIMAL),0.00)) AS nvarchar(250)) 
   else cast(intAllocatedResourceperDivision as nvarchar(250)) end;