Power Query custom column sum last 5 days

[Anonymous]

Hi Guys, 

I have the following table columns: 

Posting date - Number of orders - Total sales

Now I want an extra custom column that sums the sales of every posting days - 5 days back. 
So on 13-11-2019 i want that the custom column shows me the sum of total sales from the dates 13-11 / 12-11 / 10-11 / 09/11 and 08/11. 

I know there are easy measures to fix this, but i really need it as a custom column in my table. 

Can somebody help me? 

[v-shex-msft]

Hi @Anonymous ,

Can you please share some sample data for test? I 'm not clear your data structure and it is hard to coding formula without any detail information.

Regards,

Xiaoxin Sheng

[Anonymous]

Hi @v-shex-msft 

This is an example of the data. 
I need an extra column that sums the total sales of 5 days back from that date. 

So on 6-1-2019 it's a sum of 6-1 5-1 4-1 3-1 and 2-1

[v-shex-msft · Accepted solution]

Hi @Anonymous ,

You can refer to the following sample if it suitable for your requirement:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("TZLLjQNRCARz8dnCNH9iWTn/NPZZGpg5lxo1BX9/L3zwEUa/3i9hqnDOZnt93z8kg1qJnaU09EI6yIuiubxkUjYom06iApIX8kFRBATCbFKxKaeoMveMC+UgNRIF9DS5UA0qJk1ms5pUb0oJrirJuBB4F2sKjWibgVgd7T/kjuhh8hjJ3vDYjlghUqfJ6djYmWskjmK2VORWWSV2aiZba45j3E6YpDJKW4blw7KhHqfBSgkj1XYu7AprpYy4VVrV59prRYssvLN7Zgoel4sTYveZKavFmtxDxHzWk/tPhM5I7vT9LnvMzJb21s2tlgJBDBrYnqvFk6pNJHV7rhZJMj2PeZLDbi8g53DT+9PXSyi1QUR1zqf8cKZHKG6ful4yKNIB/Hb//gM=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [Date = _t, Amount = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type date}, {"Amount", type number}}),
    #"Added Custom" = Table.AddColumn(#"Changed Type", "Rolling 5 Days", each Function.Invoke((current as date,tb as table)=> List.Sum(Table.SelectRows(tb,each [Date]>=Date.AddDays(current,-5) and [Date]<=current)[Amount]),{[Date],#"Changed Type"}))
in
    #"Added Custom"

Regards,

Xiaoxin Sheng

[Anonymous]

Great code! Thank you 

 Any advice to adding groups to the code? I.e. accumulate last five days' sales for each product? 

[Anonymous]

@v-shex-msft 

Do i just need to ad an custom column with this code? 

Table.AddColumn(#"Changed Type", "Rolling 5 Days", each Function.Invoke((current as date,tb as table)=> List.Sum(Table.SelectRows(tb,each [Date]>=Date.AddDays(current,-5) and [Date]<=current)[Amount]),{[Date],#"Changed Type"}))

Or what do i have to do, i'm quite new in the whole powerquery part.  

When  i try this, i get not the same result as you @v-shex-msft 

[v-shex-msft]

HI @Anonymous ,

You can add a custom column and paste above formula in it:

Function.Invoke((current as date,tb as table)=> List.Sum(Table.SelectRows(tb,each [Date]>=Date.AddDays(current,-5) and [Date]<=current)[Amount]),{[Date],#"Changed Type"})

Notice: replace bold part with your column and steps name.

Regards,

Xiaoxin Sheng