How to enter a initial value to calculate inventory in Power Query or DAX

[Anonymous]

I have a table with 5 columns in order to calculate inventory per day. I am able to transfer the number from Final Inventory (Inventory - Used + Arrived ) to the next raw in Inventory; however, I dont know how to insert the initial inventory number .in the inventory column.

In excel this is pretty easy; the initial inventory goes in the first cell in the inventory column and the formula starts in the second row.

I would appreciate the help to do this on Power BI using Power Query / DAX or M...

Date // Inventory // Product Qty used // Product arrived // Final Inventory

[Anonymous · Accepted solution]

Hi @Anonymous 

You can create a blank query and put the follwing code to advanced editor in power query

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("bc7bCcAwCAXQXfwOxCe1swT3X6MmloJQUIR74OJawMgyaRIMcETMUxvjM80gx/wwMTa1UuGjal2vUpJS73qXsv0201tNxbrfi3gA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [Date = _t, Inventory = _t, #" Product Qty used" = _t, #"Product arrived " = _t]),
    #"Changed Type" = Table.TransformColumnTypes(Source,{{"Date", type date}, {"Inventory", Int64.Type}, {" Product Qty used", Int64.Type}, {"Product arrived ", Int64.Type}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 1, 1, Int64.Type),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Custom", each List.Sum(Table.SelectRows(#"Added Index",(x)=>x[Index]<=[Index])[#" Product Qty used"])),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "Custom.1", each List.Sum(Table.SelectRows(#"Added Index",(x)=>x[Index]<=[Index])[#"Product arrived "])),
    #"Added Custom2" = Table.AddColumn(#"Added Custom1", "Final", each if [Index]=1 then [Inventory] else List.Min(Table.SelectRows(#"Added Custom1",(x)=>x[Index]=1)[Inventory])-[Custom]+[Custom.1]),
    #"Removed Columns" = Table.RemoveColumns(#"Added Custom2",{"Index", "Custom", "Custom.1"})
in
    #"Removed Columns"

Output

Best Regards!

Yolo Zhu

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[rubayatyasmin]

Hi, @Anonymous 

one way would be using PQ to create a custom column to enter your initial inventory logic. then create another customer col to calculate final inv. like

if [Date] = List.Min(Table[Date]) then [Initial Inventory] else [Inventory] - [Product Qty used] + [Product Arrived]