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hymieho's avatar
hymieho
Resolver I
8 years ago
Solved

Combine multiple CSV files, then add IsLatest column based on date in filename in Power Query / M

I am importing a series of CSV file and they all have a date in the file name.  Ex:   2017-09-26.CSV 2017-10-23.CSV etc.   I am able to combine them and create a date column based on the filena...
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  • v-jiascu-msft's avatar
    v-jiascu-msft
    8 years ago

    Hi hymieho,

     

    You can try a custom column like this:

    List.Max(#"Changed Type"[Column1])

    Combine_multiple_CSV_files

     

    Best Regards,

    Dale

v-jiascu-msft's avatar
v-jiascu-msft
Microsoft Employee
8 years ago

Hi hymieho,

 

You can try a custom column like this:

List.Max(#"Changed Type"[Column1])

Combine_multiple_CSV_files

 

Best Regards,

Dale

hymieho's avatar
hymieho
Resolver I
8 years ago

Works like a charm--thanks for the tip!

 

1. Add a (temporary) custom column as you mentioned with the List.Max(date)

2. Add a 2nd custom column that checks to see if [Date] = [Latest Date in group]

3. Remove the temp column

 

#"Added Conditional Column" = Table.AddColumn(#"Added Custom", "IsLatest", each if [Add Column with latest date] = [Date] then "Yes" else "No"),
#"Renamed Columns2" = Table.RenameColumns(#"Added Conditional Column",{{"Add Column with latest date", "Latest Date in group"}}),
#"Removed Columns1" = Table.RemoveColumns(#"Renamed Columns2",{"Latest Date in group"})