Skip to main content
cancel
Showing results for 
Search instead for 
Did you mean: 

Find everything you need to get certified on Fabric—skills challenges, live sessions, exam prep, role guidance, and more. Get started

Reply
Nida
Frequent Visitor

How do I subtract a value based upon the difference in date?

Hi All,

 

I hope you're well,

 

I wondering if someone might be able to advise me regarding how I can subtract these pseudonymised(fruit values) per day by the previous day to see the increase on a whole or average level. 

Nida_0-1674652053833.png

 

This is my table with the columns

 

Nida_1-1674651533751.png

This is my current Query I would like to create a new query one which subtract for example apples for 05.11.2022 - 04.11.2022 so I would like to calculate the difference of increase of decrease in number of fruits per day. 

 

Many thanks

2 ACCEPTED SOLUTIONS
BA_Pete
Super User
Super User

Hi @Nida ,

 

You can sort your table on [FruitName] and [Date], then merge the table on itself using two indexes.

A full explanation and example query here:

https://community.powerbi.com/t5/Power-Query/Group-By-with-Index-and-Calculated-Column/m-p/3042053#M... 

 

Pete



Now accepting Kudos! If my post helped you, why not give it a thumbs-up?

Proud to be a Datanaut!




View solution in original post

v-jingzhang
Community Support
Community Support

Hi @Nida 

 

I create a sample by following Pete's solution. Hope this helps. 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8i9KzEtPLVbSUTI00gdCAyMjINvC0lgpVidaKSAzLzWxoCAHQ4GpuRlYAZJ2Q30TuKyFARbtSAosTUwxtZsitGOzHUmBOdR8FO1ABJO2NMKqH6HCAmRALAA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Fruit = _t, Date = _t, #"Count total per day" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Fruit", type text}, {"Date", type date}, {"Count total per day", Int64.Type}}),
    #"Sorted Rows" = Table.Sort(#"Changed Type",{{"Fruit", Order.Ascending}, {"Date", Order.Ascending}}),
    #"Added Index" = Table.AddIndexColumn(#"Sorted Rows", "Index", 0, 1, Int64.Type),
    #"Added Index1" = Table.AddIndexColumn(#"Added Index", "Index.1", 1, 1, Int64.Type),
    #"Merged Queries" = Table.NestedJoin(#"Added Index1", {"Fruit", "Index"}, #"Added Index1", {"Fruit", "Index.1"}, "Added Index1", JoinKind.LeftOuter),
    #"Expanded Added Index1" = Table.ExpandTableColumn(#"Merged Queries", "Added Index1", {"Count total per day"}, {"Count total per day.1"}),
    #"Renamed Columns" = Table.RenameColumns(#"Expanded Added Index1",{{"Count total per day.1", "Previous Count total per day"}}),
    #"Added Custom" = Table.AddColumn(#"Renamed Columns", "Difference", each [Count total per day] - [Previous Count total per day]),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Index", "Index.1", "Previous Count total per day"})
in
    #"Removed Columns"

vjingzhang_0-1674789879755.png

 

Best Regards,
Community Support Team _ Jing
If this post helps, please Accept it as Solution to help other members find it.

View solution in original post

4 REPLIES 4
wdx223_Daniel
Super User
Super User

NewStep=let a=Table.Sort(#"Filtered Rows1","Dates") in Table.FromRecords(List.Accumulate(Table.ToRecords(a),{{},[]},(x,y)=>let b=Record.FieldOrDefault(x{1},y[name],0) in {x{0}&{y&[Count=y[#"Count Total per day"]-b]},x{1}&Record.AddField([],y[name],y[#"Count Total per day"])}){0})

v-jingzhang
Community Support
Community Support

Hi @Nida 

 

I create a sample by following Pete's solution. Hope this helps. 

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45W8i9KzEtPLVbSUTI00gdCAyMjINvC0lgpVidaKSAzLzWxoCAHQ4GpuRlYAZJ2Q30TuKyFARbtSAosTUwxtZsitGOzHUmBOdR8FO1ABJO2NMKqH6HCAmRALAA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Fruit = _t, Date = _t, #"Count total per day" = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Fruit", type text}, {"Date", type date}, {"Count total per day", Int64.Type}}),
    #"Sorted Rows" = Table.Sort(#"Changed Type",{{"Fruit", Order.Ascending}, {"Date", Order.Ascending}}),
    #"Added Index" = Table.AddIndexColumn(#"Sorted Rows", "Index", 0, 1, Int64.Type),
    #"Added Index1" = Table.AddIndexColumn(#"Added Index", "Index.1", 1, 1, Int64.Type),
    #"Merged Queries" = Table.NestedJoin(#"Added Index1", {"Fruit", "Index"}, #"Added Index1", {"Fruit", "Index.1"}, "Added Index1", JoinKind.LeftOuter),
    #"Expanded Added Index1" = Table.ExpandTableColumn(#"Merged Queries", "Added Index1", {"Count total per day"}, {"Count total per day.1"}),
    #"Renamed Columns" = Table.RenameColumns(#"Expanded Added Index1",{{"Count total per day.1", "Previous Count total per day"}}),
    #"Added Custom" = Table.AddColumn(#"Renamed Columns", "Difference", each [Count total per day] - [Previous Count total per day]),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom",{"Index", "Index.1", "Previous Count total per day"})
in
    #"Removed Columns"

vjingzhang_0-1674789879755.png

 

Best Regards,
Community Support Team _ Jing
If this post helps, please Accept it as Solution to help other members find it.

BA_Pete
Super User
Super User

Hi @Nida ,

 

You can sort your table on [FruitName] and [Date], then merge the table on itself using two indexes.

A full explanation and example query here:

https://community.powerbi.com/t5/Power-Query/Group-By-with-Index-and-Calculated-Column/m-p/3042053#M... 

 

Pete



Now accepting Kudos! If my post helped you, why not give it a thumbs-up?

Proud to be a Datanaut!




Nida
Frequent Visitor

Hi @BA_Pete,

 

I apologise for my very late reply. I really appreciate the answer you have posted. However, I am looking to run queries without applying surface level filters and trying to apply simpler queries as shown in my screenshot

 

Many thanks,

 

Nida 

Helpful resources

Announcements
Europe Fabric Conference

Europe’s largest Microsoft Fabric Community Conference

Join the community in Stockholm for expert Microsoft Fabric learning including a very exciting keynote from Arun Ulag, Corporate Vice President, Azure Data.

Power BI Carousel June 2024

Power BI Monthly Update - June 2024

Check out the June 2024 Power BI update to learn about new features.

RTI Forums Carousel3

New forum boards available in Real-Time Intelligence.

Ask questions in Eventhouse and KQL, Eventstream, and Reflex.

Top Solution Authors
Top Kudoed Authors