Question

我希望在参数表中将每个参数的总和作为列添加表结构有两列ParamaterId和ResultValue 表的值是

ParameterId ResultValue
2D/Ao Root Diam 0.03154840000000
AVA (VTI)   0.00016937690000
AVA (VTI)   0.00016937690000
2D/Ao Root Diam 0.03473202000000
AVA (VTI)   0.00006636187000
AVA (VTI)   0.00006755497000

我想将ParameterId显示为列标题和ResultValue的总和

AVA (VTI)             2D/Ao Root Diam
Sum(ResultValue)       Sum(ResultValue)

下面的查询生成正确的resutl但结果不是单行，我需要输出应该是单行

AVA (VTI)          2D/Ao Root Diam
.573844582491253138     0
0                     18.5821659893339723

select 
    sum (case when ParameterId = 'AVA (VTI)' then (ResultValue) else 0 end) as 'AVA (VTI)',
    sum(case when ParameterId = '2D/Ao Root Diam' then (ResultValue) else 0 end) as '2D/Ao Root Diam'
   from DBCREATORS.Parameter as P
where ParameterId 
in ('AVA (VTI)', '2D/Ao Root Diam')
   group by ParameterId

期望的结果应该是

AVA (VTI)              2D/Ao Root Diam
.573844582491253138    18.5821659893339723

请帮忙

谢谢，

Answer 1

另一种可能性是使用子查询。

select
(
    select sum (ResultValue) 
    from DBCREATORS.Parameter as P 
    where ParameterId = 'AVA (VTI)'
) as 'AVA (VTI)',
(
    select sum (ResultValue) 
    from DBCREATORS.Parameter as P 
    where ParameterId = '2D/Ao Root Diam'
) as '2D/Ao Root Diam'

这应该是比我之前的建议更好的解决方案。

Answer 2

通过以下方式取出小组：

select 
sum (case when ParameterId = 'AVA (VTI)' then (ResultValue) else 0 end) as 'AVA (VTI)',
sum(case when ParameterId = '2D/Ao Root Diam' then (ResultValue) else 0 end) as '2D/Ao Root Diam'
from DBCREATORS.Parameter as P
where ParameterId 
in ('AVA (VTI)', '2D/Ao Root Diam')

没有SQL Server的组将所有内容组合成一行。您的when子句将使您的值不会发生变化。

您也可以查看pivot运算符。

结果为单行

2 个答案: