Question

我在Access中有以下代码，我需要它在sql中工作，Is数字部分让我失望。

Sum([Employee Count]*IIf(IsNumeric([Length]),[Length],0)) AS Total_hours,

Answer 1

您将IIF()替换为CASE表达式。 IsNumeric()在SQL Server中有效：

Sum([Employee Count]*
    case when IsNumeric([Length]) = 1
          then [Length]
          else 0 end) AS Total_hours,

Answer 2

您也可以只过滤“not isnumeric”，因为0不会影响SUM聚合。

select
Sum([Employee Count]*[Length]) AS Total_hours
...
where isnumeric([Length]) = 1

见下面的代码。

declare @table table (abc varchar(100))
insert into @table
select '1'
union select '200'
union select '200A'

select sum(convert(int,abc))
from @table
where isnumeric(abc) = 1

sqlfiddle

将访问代码转换为SQL

2 个答案: