PowerBI-两行结合多表过滤器的区别

如何解决PowerBI-两行结合多表过滤器的区别

我是powerbi DAX的新手，正在努力计算两条线之间的差异。

数据集描述了一个公交网络，由三个表组成。下面给出示例：

表1

Transport_type,Line_number
Bus,101
Bus,102

表2

Line_number,Trip,Stop_name,Stop_sequence
101,monday-101-1,stop-101-a,1
101,stop-101-b,2
101,stop-101-c,3
101,monday-101-2,2
102,monday-102-1,stop-102-c,3
102,stop-102-b,stop-102-a,1
102,monday-102-2,3

表3

Stop_name,Altitude
stop-101-a,540
stop-101-b,560
stop-101-c,590
stop-102-a,230
stop-102-b,210
stop-102-c,170

表之间的关系已经在模型选项卡中设置；在报告标签中，我创建了一个表格，并通过拖放添加了所有参数。

在选择了Table3后，我创建了一个新的计算列，并极力尝试计算行程的每个停靠点之间的高度差。

预期结果示例

Transport_type,Line_number,Stop_sequence,Altitude difference
Bus,101,1,0
Bus,2,20 (=560-540)
Bus,3,30 (=590-560)
Bus,102,-40 (=170-210)
Bus,-20 (=210-230)
Bus,-40 (=170-210)

有人对如何组合来自不同表的过滤器然后减去两行有任何想法吗？

感谢您的帮助：）

解决方法

您可以在功率查询中执行一些转换以实现所需的输出。我考虑了 table2 和 Table3 。在 Table2 -

的高级查询下面

重要：停止顺序在这里起着主要作用，用于查找sopt_name的开始和结束。

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WciotVtJRMjQwBJK5+XkpiZW6QI4uiFtckl8A5iSCVCjF6hCnOgnIMSJadTKQY4xPtRFJLjEi32xMdxshqzZCdrcRFrPxqSbNbExfoqk2Il81QZcYYfFlLAA=",BinaryEncoding.Base64),Compression.Deflate)),let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Transport_type = _t,Line_number = _t,Trip = _t,Stop_name = _t,Stop_sequence = _t]),#"Changed Type" = Table.TransformColumnTypes(Source,{{"Transport_type",type text},{"Line_number",Int64.Type},{"Trip",{"Stop_name",{"Stop_sequence",Int64.Type}}),//-- My transformation starts from here
    #"Sorted Rows" = Table.Sort(#"Changed Type",{{"Line_number",Order.Ascending},Order.Ascending}}),#"Added Custom" = Table.AddColumn(#"Sorted Rows","Custom",each [Stop_sequence] - 1),#"Merged Queries" = Table.NestedJoin(#"Added Custom","Trip","Custom"},#"Added Custom","Stop_sequence"},"Added Custom",JoinKind.LeftOuter),#"Expanded Added Custom" = Table.ExpandTableColumn(#"Merged Queries",{"Stop_name"},{"Added Custom.Stop_name"}),#"Renamed Columns" = Table.RenameColumns(#"Expanded Added Custom",{{"Added Custom.Stop_name","stop_name_start"}}),#"Reordered Columns" = Table.ReorderColumns(#"Renamed Columns",{"Transport_type","Line_number","stop_name_start","Stop_name","Stop_sequence","Custom"}),#"Merged Queries1" = Table.NestedJoin(#"Reordered Columns",{"stop_name_start"},table3,"table3",#"Expanded table3" = Table.ExpandTableColumn(#"Merged Queries1",{"Altitude"},{"table3.Altitude"}),#"Merged Queries2" = Table.NestedJoin(#"Expanded table3",#"Expanded table1" = Table.ExpandTableColumn(#"Merged Queries2",{"table3.Altitude.1"}),#"Renamed Columns1" = Table.RenameColumns(#"Expanded table1",{{"table3.Altitude","start_altitude"},{"table3.Altitude.1","stop_altitude"}}),#"Added Custom1" = Table.AddColumn(#"Renamed Columns1","Custom.1",each [stop_altitude] - [start_altitude]),#"Renamed Columns2" = Table.RenameColumns(#"Added Custom1",{{"Custom.1","distance"}})
in
    #"Renamed Columns2"

这是最终输出-

,

非常感谢您的帮助！

我正在尝试复制您的解决方案，但是在第一个合并的查询中出现错误：

let
    Source = Csv.Document(File.Contents("C:\Users\l.charles-antoine\Desktop\Test BI\gtfs_fp2020_2020-08-26\test alt-dist\stop_tumes.csv"),[Delimiter=";",Columns=4,Encoding=1252,QuoteStyle=QuoteStyle.None]),#"Promoted Headers" = Table.PromoteHeaders(Source,[PromoteAllScalars=true]),#"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{" Trip",{" Stop_name",{" Stop_sequence",#"Sorted Rows" = Table.Sort(#"Changed Type",each ([#" Stop_sequence"])-1),JoinKind.LeftOuter)
in
    #"Merged Queries" 

错误是：Expression.Error：找不到表的“行”列。 细节： 行程