使用 M 计算 Power Query 中的余额

Question

我有两个 table：

第一个持有发送给客户的退款：

Customer ID	Refund ID	Total refunded
1	Ref1	0.00
1	Ref2	0.00
1	Ref3	0.00
2	Ref4	0.00

第二个链接上面的 table 与相关的信用票据：

Customer ID	Credit note Allocation ID	Refund Amount Allocated	Refund ID
1	CnAll1	0.00	Ref1
1	CnAll2	0.00	Ref2
1	CnAll3	.00	Ref2
1	CnAll4	0.00	Ref3

我想要实现的是第三个 table 两者的结合，每个退款都没有分配退款余额

Customer ID	Refund ID	Credit note Allocation ID	Refund Amount Allocated	Balance not allocated to any Credit note
1	Ref1	CnAll1	0.00	$-
1	Ref2	CnAll2	0.00	$-
1	Ref2	CnAll3	.00	$-
1	Ref3	CnAll4	0.00	0.00
2	Ref4		$-	0.00

Refund Ref1 与相关贷记单完全匹配。信用票据的价值 = 退款。没有余额未分配
Refund Ref2 与两张贷记单完全匹配。信用票据的价值 = 退款。没有余额未分配
Refund Ref3只匹配$100，因为信用票据的价值是$100。未分配的余额是$200-100=$100
Refund Ref4 根本不匹配，因此未分配的余额为 300 美元

我找不到在上述所有情况下计算正确余额的方法。

Answer 1

主要是做一些合并，然后将 ID 行移动一位进行比较

将您的第二个 table 作为 Table1 加载到 powerquery

使用代码将您的第一个 table 加载到 powerquery 中：

let Source = Excel.CurrentWorkbook(){[Name="Table2"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"Customer ID", Int64.Type}, {"Refund ID", type text}, {"Total refunded", Int64.Type}}),
#"Merged Queries" = Table.NestedJoin(#"Changed Type", {"Customer ID", "Refund ID"}, Table1, {"Customer ID", "Allocated Refund ID"}, "Table1", JoinKind.LeftOuter),
#"Expanded Table1" = Table.ExpandTableColumn(#"Merged Queries", "Table1", {"Credit note Allocation ID", "Refund Amount"}, {"Credit note Allocation ID", "Refund Amount"}),
RefundByID=Table.Group(Table1, {"Allocated Refund ID"}, {{"Refund Amount", each List.Sum([Refund Amount]), type nullable number}}),
#"Merged Queries2" = Table.NestedJoin(#"Expanded Table1", {"Refund ID"},RefundByID, {"Allocated Refund ID"}, "Table1", JoinKind.LeftOuter),
#"Expanded Table2" = Table.ExpandTableColumn(#"Merged Queries2", "Table1", {"Refund Amount"}, {"Refund Amount.1"}),
#"Replaced Value" = Table.ReplaceValue(#"Expanded Table2",null,0,Replacer.ReplaceValue,{"Refund Amount.1"}),
//shift Refund ID down one row
      shiftedList = List.RemoveFirstN(#"Replaced Value"[Refund ID],1) & {null},
      custom1 = Table.ToColumns(#"Replaced Value") & {shiftedList},
      custom2 = Table.FromColumns(custom1,Table.ColumnNames(#"Replaced Value") & {"Next Row"}),
#"Added Custom" = Table.AddColumn(custom2, "Balance", each if [Refund ID]=[Next Row] then 0 else [Total refunded]-[Refund Amount.1]),
#"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Refund Amount.1", "Next Row"})
in  #"Removed Columns"

使用 M 计算 Power Query 中的余额

Calculate balance in Power Query with M

powerquery