How to add new rows based on input table?

[Chris1300]

Hello,

I have a starting table as input. It has 3 colomuns. Please see below. I would like to get a new table that will have more rows based on original table. See table below, Each Date# has every Activity# and every Source#. In this example, there are 4 dates, 2 activities, 2 sources. Therefore the final table row count is 4*2*2 = 16.

Can this be done in DAX?

StartDate	ActivityName	Source
Date1	Activity 1	Source1
Date2	Activity 2	Source2
Date3
Date4

The final table result should be:

StartDate	ActivityName	Source
Date1	Activity 1	Source1
Date1	Activity 2	Source1
Date1	Activity 1	Source2
Date1	Activity 2	Source2
Date2	Activity 1	Source1
Date2	Activity 2	Source1
Date2	Activity 1	Source2
Date2	Activity 2	Source2
Date3	Activity 1	Source1
Date3	Activity 2	Source1
Date3	Activity 1	Source2
Date3	Activity 2	Source2
Date4	Activity 1	Source1
Date4	Activity 2	Source1
Date4	Activity 1	Source2
Date4	Activity 2	Source2

[Vijay_A_Verma · Accepted solution]

See the working here - Open a blank query - Home - Advanced Editor - Remove everything from there and paste the below code to test (later on when you use the query on your dataset, you will have to change the source appropriately. If you have columns other than these, then delete Changed type step and do a Changed type for complete table from UI again)

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMtY30TcyVNJRckwuySzLLKlUAHGC80uLklMNlWJ1opVM9Q31jYyQVRjBVRiBVZjpGxkDEVAULmEMljDXNzTSNzKBSCjFxgIA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [StartDate = _t, ActivityName = _t, Source = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"StartDate", type date}, {"ActivityName", type text}, {"Source", type text}}),
    #"Replaced Value" = Table.ReplaceValue(#"Changed Type","",null,Replacer.ReplaceValue,{"StartDate", "ActivityName", "Source"}),
    StartDateList = List.Buffer(List.RemoveNulls(Table.Column(#"Replaced Value","StartDate"))),
    ActivityNameList = List.Buffer(List.RemoveNulls(Table.Column(#"Replaced Value","ActivityName"))),
    SourceList = List.Buffer(List.RemoveNulls(Table.Column(#"Replaced Value","Source"))),
    StartDateListCount = List.Count(StartDateList),
    ActivityNameListCount = List.Count(ActivityNameList),
    SourceListCount = List.Count(SourceList),
    ElementsCount = StartDateListCount*ActivityNameListCount*SourceListCount,
    StartDateListRepeatCount = ElementsCount/StartDateListCount,
    GenStartDateList = List.Combine(List.Transform(StartDateList,(x)=>List.Repeat({x},StartDateListRepeatCount))),
    SourceListRepeatCount = ElementsCount/SourceListCount,
    GenSourceListTemp = List.Combine(List.Transform(SourceList,(x)=>List.Repeat({x},ActivityNameListCount))),
    GenSourceList = List.Combine(List.Repeat({GenSourceListTemp},ElementsCount/List.Count(GenSourceListTemp))),
    ActivityNameListRepeatCount = ElementsCount/ActivityNameListCount,
    GenActivityNameListTemp = List.Combine(List.Repeat({ActivityNameList},SourceListCount)),
    GenActivityNameList = List.Combine(List.Repeat({GenActivityNameListTemp},ElementsCount/List.Count(GenActivityNameListTemp))),
    Result = Table.FromColumns({GenStartDateList} & {GenActivityNameList} & {GenSourceList},Table.ColumnNames(Source))
in
    Result