Group by date range - Powe query

[Alex_nor]

Hello all,

I have two columns: TimeStamp and LoadDate. 

I would like to create a third column, LoadID based on this criteria:

Dates between 23-06-2022 and 04-07-2022 in TimeStamp should have LoadID = 05-07-2022,

dates between 05-07-2022 and 27-07-2022 in TimeStamp should have LoadID = 28-07-2022, and so on.

Do you have any suggestion?

[v-yalanwu-msft · Accepted solution]

Hi, @Alex_nor ;

See the working here - Open a blank query - Home - Advanced Editor - Remove everything from there and paste the below code to test.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("ZdJLDoAgEATRu7A2wenh51kM97+GiRoIxY5qXbyI9x1KlEedUjhC6Mc7JA6ZQ+FQOTQOFwY/l6FGQwvt6IQeyHH89oL3KrqhL7o2KKVGqtFqxFrmQKbRaYQapaJU2zelVJSKUlEqSkXpvPx5/p+QvP0FvpJbZAvt6ITO6IKu6IYe4nHs/QE=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Timestamp = _t, LoadDate = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Timestamp", type date}, {"LoadDate", type date}}),
    #"Sorted Rows" = Table.Sort(#"Changed Type",{{"Timestamp", Order.Ascending}}),
    #"Added Custom" = Table.AddColumn(#"Sorted Rows", "Custom", each [LoadDate]),
    #"Filled Up" = Table.FillUp(#"Added Custom",{"Custom"}),
    #"Added Conditional Column" = Table.AddColumn(#"Filled Up", "Load Id", each if [Timestamp] = [Custom] then null else [Custom]),
    #"Filled Up1" = Table.FillUp(#"Added Conditional Column",{"Load Id"}),
    #"Removed Columns" = Table.RemoveColumns(#"Filled Up1",{"Custom"})
in
    #"Removed Columns"

The final show:

Best Regards,
Community Support Team _ Yalan Wu
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

[PhilipTreacy]

Hi @Alex_nor 

Try this M code  : Download sample file

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"TimeStamp", type date}, {"LoadDate", type date}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "LoadID", each if [TimeStamp] <= #date(2022,7,4) then #date(2022,7,5)

else if [TimeStamp] <= #date(2022,7,27) then #date(2022,7,28)

else null)
in
    #"Added Custom"

Which gives this

In my data the date columns are actually dates, in your data they look to be text.

Regards

Phil