Forum Discussion
Helper IAutomatically generate columns in Power Query
Hi snowrider1799 ,
This is a solution, but I agree with Greg_Deckler , you may want to revisit the model, you may be better off using the migration to PBI as an opportunity to improve the model.
let Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("NcvJDcBACEPRXjiP5LBFSS2I/tsIMJnb15MdQQIGO60dL+UKcvgxOTb5lGmFXGPWu7aO324omMsm9ldhYJuv9SHzAw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [#"File Date" = _t, #"Expiry Date" = _t]), #"Changed Type" = Table.TransformColumnTypes(Source,{{"File Date", type date}, {"Expiry Date", type date}}), //Plug in your source table here SourceTable = #"Changed Type", //This builds a list of years from the data ListOfYearsUsed = List.Sort(List.Transform(List.Combine({SourceTable[File Date], SourceTable[Expiry Date]}), Date.Year)), //Please feel free to replace with manual year range which looks like {2010..2020} ListOfYears = {ListOfYearsUsed{0}..List.Last(ListOfYearsUsed)}, //This cycles through the list of years and add columns for each year #"Added Custom" = List.Accumulate(ListOfYears, SourceTable, (a, n)=> Table.AddColumn(a, Text.From(n), each if Date.Year([File Date]) <= Number.From(n) and Date.Year([Expiry Date]) > Number.From(n) then 1 else null, type number)) in #"Added Custom"Kind regards,
JB
Helper IHi Greg,
Yea, the user was very sophisticated in Excel, and currently we're trying to use PBI to generate the same result. That is why it feels like pivot and unpivot.
Here's the sample I'm attaching below:
The green columns is what generated manually in Excel, and it is needed for some calculation using the File Date and Expiration Date with the formula: ==IF(AND(YEAR($C4)>D$1,YEAR($B4)<=D$1),1,"").
I would appreciate if there are better approach to this. Thanks in advance.
Hi snowrider1799 ,
This is a solution, but I agree with Greg_Deckler , you may want to revisit the model, you may be better off using the migration to PBI as an opportunity to improve the model.
let
Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("NcvJDcBACEPRXjiP5LBFSS2I/tsIMJnb15MdQQIGO60dL+UKcvgxOTb5lGmFXGPWu7aO324omMsm9ldhYJuv9SHzAw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [#"File Date" = _t, #"Expiry Date" = _t]),
#"Changed Type" = Table.TransformColumnTypes(Source,{{"File Date", type date}, {"Expiry Date", type date}}),
//Plug in your source table here
SourceTable = #"Changed Type",
//This builds a list of years from the data
ListOfYearsUsed = List.Sort(List.Transform(List.Combine({SourceTable[File Date], SourceTable[Expiry Date]}), Date.Year)),
//Please feel free to replace with manual year range which looks like {2010..2020}
ListOfYears = {ListOfYearsUsed{0}..List.Last(ListOfYearsUsed)},
//This cycles through the list of years and add columns for each year
#"Added Custom" = List.Accumulate(ListOfYears, SourceTable, (a, n)=> Table.AddColumn(a, Text.From(n), each if Date.Year([File Date]) <= Number.From(n) and Date.Year([Expiry Date]) > Number.From(n) then 1 else null, type number))
in
#"Added Custom"
Kind regards,
JB
- snowrider1799
Hi Anonymous ,
Thanks for the tricks, it works. I have a follow-up query regarding this.
Say now I have to group by a col call Company, and the years (1999 -- 2020) is the aggregation (SUM) I need to calculate. Are there any ways to do it in a single line? Instead of my manual insertion?
I would like to keep the 1999 to 2020 dynamic like Text.From(n) as the new column name.
Thanks Much!
Hi snowrider1799 ,
something like this:
let Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("NcvJDcBACEPRXjiP5LBFSS2I/tsIMJnb15MdQQIGO60dL+UKcvgxOTb5lGmFXGPWu7aO324omMsm9ldhYJuv9SHzAw==", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"File Date" = _t, #"Expiry Date" = _t]), #"Changed Type" = Table.TransformColumnTypes(Source, {{"File Date", type date}, {"Expiry Date", type date}}), // Plug in your source table here SourceTable = #"Changed Type", // This builds a list of years from the data ListOfYearsUsed = List.Sort(List.Transform(List.Combine({SourceTable[File Date], SourceTable[Expiry Date]}), Date.Year)), // Please feel free to replace with manual year range which looks like {2010..2020} ListOfYears = {ListOfYearsUsed{0}..List.Last(ListOfYearsUsed)}, // This cycles through the list of years and add columns for each year #"Added Custom" = List.Accumulate(ListOfYears, SourceTable, (a, n)=> Table.AddColumn(a, Text.From(n), each if Date.Year([File Date]) <= Number.From(n) and Date.Year([Expiry Date]) > Number.From(n) then 1 else null, type number)), // This generates list parameter for Table.Group Parameters = List.Accumulate(ListOfYears, {}, (a,n)=> a & {{Text.From(n), (x)=> List.Sum(Table.Column(x, Text.From(n))), type number}}), #"Grouped rows" = Table.Group(#"Added Custom", {"Expiry Date"}, Parameters) in #"Grouped rows"NB: change "Expiry Date" in the #"Grouped rows" to "Ultimate Parent" as per your screenshot.
Kind regards,
JB
- snowrider1799
Thank you Anonymous , you've helped a bunch!
- Yes. It is possible. In the same fashion as with column names - using List.Accumulate to generate a list if parameters for Table.Group. you can experiment yourself- i will post a.solutikn in 2-3 hours once I have access to PBI.
Kind regards
JB