SQL Server：具有字母数字值的列的总和

Question

我想得到字母数字列的总和。如果不是数字，我想添加数值并返回列值。我所做的是添加了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

所以我假设将添加所有数值，如果值在('CL', 'HS', 'HV', 'ML', 'SL', 'VL', 'HC', 'S', '*') 中，它将按原样返回。

但我得到了

将数据类型 nvarchar 转换为数值时出错。

Answer 1

看起来您的 SUM 聚合不合适。仅当 case 语句中的条件为真时才求和。试试这个：

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

如果您不知道非数字值的确切潜在组合，您可以使用ISNUMERIC 函数（假设您使用 SQL Server）来测试该值是否为数字并分配 0如果不是，则汇总最终结果。

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

要聚合数值并保持非数值，您可以使用联合查询：

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

试试这个：

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','*')