如果所选类别的级别低于配置的级别，则显示最低级别

如何解决如果所选类别的级别低于配置的级别，则显示最低级别

我有下表

类别

Category Id     |    Name     | Parent Id   |   Category Level
-------------------------------------------------------------
     1          |   Vehicle   |    Null     |         1
     2          |     Car     |     1       |         2
     3          |    Sedan    |     2       |         3
     4          |   Computer  |    Null     |         1
     5          |    Laptop   |     4       |         2
     6          |    Gaming   |     5       |         3
     7          |   Alienware |     6       |         4

类别级别是根据类别层次结构决定的。

在“类别”表中，我们有两个主要类别：“车辆”和“计算机”

如果我选择了4级，那么如果该类别中没有4级，那么我希望在4级类别中进行记录，那么我希望在最低级别上进行记录。因此，在输出中，我们将获得Sedan（车辆中的最低车）和Alienware（4级）。

谁能建议我如何在Power BI中实现这一目标。

解决方法

考虑到最高级别：4，让您的表Category包含以下记录

现在使用下面的代码在 Power Query Editor 中创建新表 Category_new

let
    Source = Category,#"Changed Type" = Table.TransformColumnTypes(Source,{{"Category Id",Int64.Type},{"Name",type text},{"Parent Id",{"Category Level",Int64.Type}}),#"Reordered Columns" = Table.ReorderColumns(#"Changed Type","Category Id","Name","Parent Id"}),#"Merged Queries" = Table.NestedJoin(#"Reordered Columns",{"Parent Id"},#"Reordered Columns",{"Category Id"},"Reordered Columns",JoinKind.LeftOuter),#"Expanded Reordered Columns" = Table.ExpandTableColumn(#"Merged Queries",{"Reordered Columns.Parent Id"}),#"Renamed Columns" = Table.RenameColumns(#"Expanded Reordered Columns",{{"Reordered Columns.Parent Id","Parent Id 2"}}),#"Merged Queries1" = Table.NestedJoin(#"Renamed Columns",{"Parent Id 2"},#"Renamed Columns","Renamed Columns",#"Expanded Renamed Columns" = Table.ExpandTableColumn(#"Merged Queries1",{"Renamed Columns.Parent Id"}),#"Renamed Columns1" = Table.RenameColumns(#"Expanded Renamed Columns",{{"Renamed Columns.Parent Id","Parent Id 3"}}),#"Merged Queries2" = Table.NestedJoin(#"Renamed Columns1",{"Parent Id 3"},#"Renamed Columns1","Renamed Columns1",#"Expanded Renamed Columns1" = Table.ExpandTableColumn(#"Merged Queries2",{"Renamed Columns1.Parent Id"}),#"Renamed Columns2" = Table.RenameColumns(#"Expanded Renamed Columns1",{{"Renamed Columns1.Parent Id","Parent Id 4"}}),#"Added Custom" = Table.AddColumn(#"Renamed Columns2","Custom",each List.Min({[Category Id],[Parent Id],[Parent Id 2],[Parent Id 3],[Parent Id 4]})),#"Added Custom1" = Table.AddColumn(#"Added Custom","Custom.1",each List.Max({[Category Id],#"Renamed Columns3" = Table.RenameColumns(#"Added Custom1",{{"Custom","Root Category"},{"Custom.1","Max Level"}}),#"Merged Queries3" = Table.NestedJoin(#"Renamed Columns3",{"Root Category"},#"Renamed Columns3","Renamed Columns3",#"Expanded Renamed Columns3" = Table.ExpandTableColumn(#"Merged Queries3",{"Name"},{"Renamed Columns3.Name"}),#"Renamed Columns4" = Table.RenameColumns(#"Expanded Renamed Columns3",{{"Renamed Columns3.Name","Root Category Name"}}),#"Grouped Rows" = Table.Group(#"Renamed Columns4",{"Root Category Name"},{{"max_level",each List.Max([Max Level]),type nullable number}}),#"Merged Queries4" = Table.NestedJoin(#"Grouped Rows",{"max_level"},Category,"Category",#"Expanded Category" = Table.ExpandTableColumn(#"Merged Queries4",{"Category.Name"}),#"Renamed Columns5" = Table.RenameColumns(#"Expanded Category",{{"Category.Name","lowest in category"}})
in
    #"Renamed Columns5"

这是您的最终输出-