获取超出过滤器范围的值

Question

我正在处理一个Tableau项目，该项目的长格式表格数据显示开始月份，结束月份和每月成本。我试图显示日期（每月）费用的（动态）范围，然后覆盖多月行总费用的参考线。我怀疑答案在于使用细节层次（LOD）表达式，但似乎无法弄清楚。

csv示例：

start,end,month length,x,a,b,c,d,total
1/1/2019,1/1/2019,1,1.2,0.08,0.01,0.1,0.299,0.489
2/1/2019,2/1/2019,1,1.1,0.08,0.01,0.1,0.295,0.485
3/1/2019,3/1/2019,1,0.9,0.08,0.01,0.12,0.285,0.495
1/1/2019,2/1/2019,2,2.3,0.08,0.01,0.1,0.297086956521739,0.487086956521739
2/1/2019,3/1/2019,2,2,0.08,0.01,0.109,0.2905,0.4895
1/1/2019,3/1/2019,3,3.2,0.08,0.01,0.105625,0.2936875,0.4893125

忽略x，a，b，c，d-它们是为了显示图表具有等于每月总计的多个度量。

对于相同的开始和结束月份，我们有一个month length: 1。与这些行关联的值是每月值。为了绘制动态的月份范围，我可以通过过滤month length: 1并添加用于将开始日期设置为结束日期范围[Start Date] >= [Selected Start Date] AND [Start Date] <= [Selected End Date]

的计算字段过滤器来绘制这些月度值

鉴于此表，我如何显示针对所选的开始到结束范围（total，start date: 1/1/2019，end date: 3/1/2019）的month length: 3值的参考线，即使有month length: 1的过滤器？最终结果将是一行0.4893125

Answer 1

是的，是的，您需要使用LoD。

如果您需要绕过过滤器，则使用LoD Fixed，尽管过滤器为month = 3，下面的代码段将为您提供month=1的数据。根据您的要求更改代码：

{ FIXED : Max(IF [Month Length] = 3 THEN [A] END)}

编辑------------------------------------------------ ------------------------

{ FIXED : 
Max(
IF ([Start Date] >= [Selected Start Date] AND 
[Start Date] <= [Selected End Date]) AND
[Month Length] = 3 THEN [A] END)}