Power BI：组之间的重叠百分比

如何解决Power BI：组之间的重叠百分比

我有一个数据集，其中有两列：“班级”和“学生”。我正在尝试查找班级之间的重叠率（例如，班级A中的学生人数也占班级B的百分比）？

我认为应该通过在PowerQuery中扩展表以比较每个类，然后通过groupby来显示重叠百分比来完成此操作？有什么想法吗？

以下是一些示例数据和预期的输出：

所需的输出（随机产生的百分比）：

解决方法

尝试以下代码：

let
    Source = Table.Buffer(Excel.Workbook(File.Contents("C:\Path\YourWorkbook.xlsx"))
                                         {[Item="YourTable",Kind="Table"]}[Data]),group = Table.Group(Source,{"Class"},{"CompareClass",each List.Distinct(Source[Class])}),expand = Table.ExpandListColumn(group,"CompareClass"),filter = Table.SelectRows(expand,each [Class] <> [CompareClass]),add = Table.AddColumn(filter,"Overlap",each let
                a = Table.RowCount(Table.SelectRows(Table.Group(Source,{"Student"},{"c",each [Class]}),(x)=> List.ContainsAll(x[c],{[Class],[CompareClass]}))),b = Table.RowCount(Table.SelectRows(Source,(x)=>x[Class] = [CompareClass]))
                in a/b,Percentage.Type)
in
    add

,

您可以通过如下所述创建一些其他表来在功率查询中达到目的-

让您的源表名称：Course 表格中的列名称：班级，学生

现在，转到电源查询编辑器并执行以下步骤-

第1步：：将源表“ Course”复制到3个新表中，并将其命名为-

"course_1"
"course_2"
"course_3"

步骤2：使用以下代码编辑“ course_1”高级查询代码-

let
    Source = Excel.Workbook(File.Contents("D:\WORK\R&D\Book2.xlsx"),null,true),course_percentage_Sheet = Source{[Item="course_percentage",Kind="Sheet"]}[Data],#"Changed Type" = Table.TransformColumnTypes(course_percentage_Sheet,{{"Column1",type text},{"Column2",type text}}),#"Promoted Headers" = Table.PromoteHeaders(#"Changed Type",[PromoteAllScalars=true]),#"Changed Type1" = Table.TransformColumnTypes(#"Promoted Headers",{{"class",{"student",//-------------------------------
    //-- This below part is new code
    //-------------------------------
    #"Grouped Rows" = Table.Group(#"Changed Type1",{"class"},{{"Count",each Table.RowCount(_),Int64.Type}})
in
    #"Grouped Rows" 

第3步：：使用下面的代码编辑“ course_2”高级查询代码-

let
    Source = Excel.Workbook(File.Contents("D:\WORK\R&D\Book2.xlsx"),//-------------------------------
    //-- This below part are new code
    //-------------------------------
    #"Merged Queries" = Table.NestedJoin(#"Changed Type1",{"student"},#"Changed Type1","Changed Type1",JoinKind.LeftOuter),#"Expanded Changed Type1" = Table.ExpandTableColumn(#"Merged Queries",{"class","student"},{"Changed Type1.class","Changed Type1.student"}),#"Grouped Rows" = Table.Group(#"Expanded Changed Type1","Changed Type1.class"},Int64.Type}})
in
    #"Grouped Rows"

步骤4：使用以下代码编辑“ course_3”高级查询代码-

let
    Source = Excel.Workbook(File.Contents("D:\WORK\R&D\Book2.xlsx"),//-------------------------------
    //-- This below part are new code
    //-------------------------------
    #"Removed Columns" = Table.RemoveColumns(#"Changed Type1",{"student"}),#"Removed Duplicates" = Table.Distinct(#"Removed Columns"),#"Added Custom" = Table.AddColumn(#"Removed Duplicates","Custom",each 1),#"Merged Queries" = Table.NestedJoin(#"Added Custom",{"Custom"},#"Added Custom","Added Custom",JoinKind.FullOuter),#"Expanded Added Custom" = Table.ExpandTableColumn(#"Merged Queries","Custom"},{"Added Custom.class","Added Custom.Custom"}),#"Sorted Rows" = Table.Sort(#"Expanded Added Custom",Order.Ascending}}),#"Removed Columns1" = Table.RemoveColumns(#"Sorted Rows",{"Custom",#"Merged Queries1" = Table.NestedJoin(#"Removed Columns1",course_1,"course_1",#"Expanded course_1" = Table.ExpandTableColumn(#"Merged Queries1",{"Count"},{"course_1.Count"}),#"Merged Queries2" = Table.NestedJoin(#"Expanded course_1","Added Custom.class"},course_2,"course_2",#"Expanded course_2" = Table.ExpandTableColumn(#"Merged Queries2",{"course_2.Count"}),#"Replaced Value" = Table.ReplaceValue(#"Expanded course_2",Replacer.ReplaceValue,#"Renamed Columns" = Table.RenameColumns(#"Replaced Value",{{"Added Custom.class","class_compare"},{"course_1.Count","total_student"},{"course_2.Count","matched_student"}}),#"Added Custom1" = Table.AddColumn(#"Renamed Columns","percentage_matched",each [matched_student]/[total_student]),#"Changed Type2" = Table.TransformColumnTypes(#"Added Custom1",{{"percentage_matched",Percentage.Type}})
in
    #"Changed Type2"

第5步：：如果要通过右键单击表格，禁用“ course_1”和“ course_2”的表格加载，并禁用“启用加载”旁边的对勾。

步骤6 ：点击“关闭并应用”按钮返回报告。

步骤7：：将表“ course_3”中“ percentage_matched”列的数据类型更改为百分比。

步骤8：：将三列-class，class_compare和“ percentage_matched”添加到表格的外观中。最终输出应该类似于下面的图像-