How To Dynamic Rename Column Headers: [Month] & [Current Year] in P. Query

[Syndicate_Admin]

I am new beginner of Power Query. My current raw data (1st screenshot below) consists of column headers (Column B - M) without [Year Name]. 

Column A	Column B	Column C	Column D	Column E	Column F	Column G	Column H	Column I	Column J	Column K	Column L	Column M
	Jan	Feb	Mar	Apr	May	June	July	Aug	Sept	Oct	Nov	Dec
Sales	100	100	100	100	100	100	100	100	100	100	100	100
Expense	100	100	100	100	100	100	100	100	100	100	100	100

I manually added in [2022] in Query Editor for all months (Jan - Dec). However, when come to next year, i will have to do the similiar manual exercise to replace col. header with [2023], which bit inefficient. 

Table.RenameColumns(#"Removed Columns2",{"Jan", "Jan 2022"}, {"Feb", "Feb 2022"}, {"Mar", "Mar 2022}, {"Apr", "Apr 2022"}, {"May", "May 2022", {"June", "Jun 2022"}, {"Jul", "Jul 2022"}, {"Aug", "Aug 2022"}, {"Sep", "Sep 2022"}, {"Oct", "Oct 2021"}, {"Nov", "Nov 2022"}, {"Dec", "Dec 2022"}})

Wonder if any efficient way to write in M language that can auto rename "Year" In Column header, base on input in Excel cell below? 

let's assume i key in "2023" in Excel Cell A1 in another worktab within same workbook. 

Year

2023

Table.RenameColumns(#"Removed Columns2",{{{"Jan", "Jan 2022"}, {"Feb", "Feb 2022"}, {"Mar", "Mar 2022"}, {"Apr", "Apr 2022"}, {"May", "May 2022"}, {"Jun", "Jun 2022"}, {"Jul", "Jul 2022"}, {"Aug", "Aug 2022}, {"Sep", "Sep 2022"}, {"Oct", "Oct 2022"}, {"Nov", "Nov 2022"}, {"Dec", "Dec 2022"}})

wonder if any better way which i can dynamic col. header name in P.Query Editor, base on [Year] selection from excel cell A1, and concentrate with [Month]? 

[v-yanjiang-msft · Accepted solution]

Hi @Syndicate_Admin ,

According to your description, here's my solution. Add the step in Advanced Editor:

#"Rename"=let 
_Year=Text.From(Date.Year(Date.From(DateTime.LocalNow()))) 
in 
Table.RenameColumns(#"Removed Columns2",{{"Jan", "Jan "&_Year}, {"Feb", "Feb "&_Year}, {"Mar", "Mar "&_Year}, {"Apr", "Apr "&_Year}, {"May", "May "&_Year}, {"Jun", "Jun "&_Year}, {"Jul", "Jul "&_Year}, {"Aug", "Aug "&_Year}, {"Sep", "Sep "&_Year}, {"Oct", "Oct "&_Year}, {"Nov", "Nov "&_Year}, {"Dec", "Dec "&_Year}})

I define a variable _Year in the code, which will automatically get the current year. When year 2023 comes, it will automatically changes to 2023 without enter in the Excel.

Here's the whole M syntax, you can copy-paste in a blank query.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUTICYmMgNgFiUyA2A2JzILYAYksgNjQAESCVhkZKsbEA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Jan = _t, Feb = _t, Mar = _t, Apr = _t, May = _t, Jun = _t, Jul = _t, Aug = _t, Sep = _t, Oct = _t, Nov = _t, Dec = _t]),
    #"Removed Columns2" = Table.TransformColumnTypes(Source,{{"Jan", Int64.Type}, {"Feb", Int64.Type}, {"Mar", Int64.Type}, {"Apr", Int64.Type}, {"May", Int64.Type}, {"Jun", Int64.Type}, {"Jul", Int64.Type}, {"Aug", Int64.Type}, {"Sep", Int64.Type}, {"Oct", Int64.Type}, {"Nov", Int64.Type}, {"Dec", Int64.Type}}),
    #"Rename"=let _Year=Text.From(Date.Year(Date.From(DateTime.LocalNow()))) in Table.RenameColumns(#"Removed Columns2",{{"Jan", "Jan "&_Year}, {"Feb", "Feb "&_Year}, {"Mar", "Mar "&_Year}, {"Apr", "Apr "&_Year}, {"May", "May "&_Year}, {"Jun", "Jun "&_Year}, {"Jul", "Jul "&_Year}, {"Aug", "Aug "&_Year}, {"Sep", "Sep "&_Year}, {"Oct", "Oct "&_Year}, {"Nov", "Nov "&_Year}, {"Dec", "Dec "&_Year}})
in
    #"Rename"

Result:

I attach my sample below for your reference.

Best Regards,
Community Support Team _ kalyj

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