excel - Power Query - 复杂的自定义列

Question

我需要创建一个自定义列，它查看 1 列，a并基于a修剪一个值b并将值放入c.

B 部分：现在如果 in 的值a不符合我的标准，那么它会查看列d以查找它是否与前一行相同，如果是，则将c前一行的值放入新行。

我现在有一部分：

if Text.End ([SAP segment name],3) = "K09"
then Text.Trim (Text.Start([Application data],35)) else ""

我需要 B 部分的帮助

Answer 1

您的公式 [B3=IF(RIGHT(R3,3)="K09",TRIM(LEFT(W3,35)), B2) ] 将为每一行返回一个错误，直到 R 第一次以 K09 结束。但是，如果那是您想要的

let Source = Table.FromList({
[SAP segment name="L04K29", Application data ="ABCDEFGHIJKLMNOP12345VWXYZabcdefghijklmnopqrstuvwxyz"] ,  
[SAP segment name="R03L09", Application data ="abcdefghijklmnop67890qrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"] ,  
[SAP segment name="L04K09", Application data ="ABCDEFGHIJKLMNOP987654QRSTUVWXYZabcdefghijklmnopqrstuvwxyz"] ,  
[SAP segment name="L04K09", Application data ="ABCDEFGHIJKLMNOPQR321254STUVWXYZabcdefghijklmnopqrstuvwxyz"] ,  
[SAP segment name="R03G09", Application data ="abcdefghijklmnopqrst87562uvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"] ,  
[SAP segment name="L04K09", Application data ="ABCDEFGHIJKLMNOPQRSTU45265VWXYZabcdefghijklmnopqrstuvwxyz"] 
}, Record.FieldValues, {"SAP segment name", "Application data"}),
#"Added Custom" = Table.AddColumn(Source, "Custom", each if Text.End ([SAP segment name],3) = "K09" then Text.Trim(Text.Start([Application data],35)) else null),
#"Filled Down" = Table.FillDown(#"Added Custom",{"Custom"})
in
#"Filled Down"