Forum Discussion
Referencing data from another row
I have a Table with the following structure
| Title | Entry | Data |
| A | 10 | MasterData 1 |
| A | 23 | SpecialData |
| A | 54 | null |
| B | 10 | MasterData 2 |
| B | 34 | null |
| B | 576 | null |
| C | 10 | null |
| C | 21312 | null |
What i want to achieve in Power Query M is that for some entries in the table i have "MasterData" which is always under Entry "10" for the corresponding Title, some may also have SpecialData which i don´t want to touch...
The Table i would want to have would be like this:
| Title | Entry | Data |
| A | 10 | MasterData 1 |
| A | 23 | SpecialData |
| A | 54 | MasterData 1 |
| B | 10 | MasterData 2 |
| B | 34 | MasterData 2 |
| B | 576 | MasterData 2 |
| C | 10 | null |
| C | 21312 | null |
So i would need to somehow reference always the Data from Entry "10" for all null values of the same title data. It could also be in a new added column if that´s easier. Filldown is not helping in this case either unfortunately because i cannot restrict it to the same Title. I just found a working formula replacing the null value with an value of the same row... how can i shift that reference to always return the corresponding Title "10" Entry if there is one?
= Table.AddColumn(#"xxx", "Data", each if [Data] = null then [Entry] else [Data], type text)
This "[Entry]" i would need to point to the corresponding 10 entry of the same title...
Any hint how to do that is very appreciated! Thanks!
NewStep=Table.Combine(Table.Group(PreviousStepName,"Title",{"n",each Table.ReplaceValue(_,"","",(x,y,z)=>x??_{[Entry=10]}?[Data],{"Data"})})[n])
3 Replies
NewStep=Table.Combine(Table.Group(PreviousStepName,"Title",{"n",each Table.ReplaceValue(_,"","",(x,y,z)=>x??_{[Entry=10]}?[Data],{"Data"})})[n])
Thanks! This is working as I need it, I don´t understand it yet but I´ll go through it step by step till i do.
Hi Thomas_DE,
I think this does what you are after. Please try.
let Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WclTSUTI0ABK+icUlqUUuiSWJCoZKsToQGSNjIBFckJqcmZgDkoJLmJoAibzSnBywiBMWQ4zgMsYYak3NzZCFnGHaUUSMDI0NjeCCsQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Title = _t, Entry = _t, Data = _t]), #"Changed Type" = Table.TransformColumnTypes(Source,{{"Title", type text}, {"Entry", Int64.Type}, {"Data", type text}}), fTransform = (t as table) as table => let Transform = List.Skip(List.Accumulate(Table.ToRecords(t), {{null, {}}}, (a, n)=> a & (if n[Entry] = 10 then {{n[Data], n }} else {{List.Last(a){0}, if n[Data]="null" then Record.TransformFields(n, {{"Data", (x)=> List.Last(a){0}}}) else n }}))), Output = Table.FromRecords(List.Zip(Transform){1}, Value.Type(t)) in Output, next = #"Changed Type", #"Grouped Rows" = Table.Combine(Table.Group(next, {"Title"}, {{"Count", fTransform}})[Count]) in #"Grouped Rows"Kind regards,
John
