如何根据条件累积列

Question

我正在尝试浏览一个列表并标记 parents 这样我就可以自己加入一个平面列表

ID  Type     Idx 
200 EPIC      0
201 Feature   1
202 Feature   2
203 Feature   3
204 EPIC      4
205 Feature   5
206 Feature   6


Prefeered result
ID  Type     Idx   Parent   
200 EPIC      0    200     
201 Feature   1    200
202 Feature   2    200
203 Feature   3    200
204 EPIC      4    204
205 Feature   5    204
206 Feature   6    204

我尝试制作 self-referencing 条件列，但那是不可能的，

#"Added Custom" = Table.AddColumn(#"Added Index", "Parent", each if [Work Item Type] = "Epic" then [ID] else # "Added Custom"{[索引]-1}[ID]),

Answer 1

添加自定义列。往下填。假设数据在 Table1 中，有 2 列名为 ID 和 Type，则

let Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Added Custom" = Table.AddColumn(Source, "Parent", each if [Type]="EPIC" then [#"ID"] else null),
#"Filled Down" = Table.FillDown(#"Added Custom",{"Parent"})
in #"Filled Down"

如何根据条件累积列

How to accumulate a column based on a condition

accumulate

powerquery