Power Query Adding of Columns

[Afiq_Danial]

Hi I have a data that looks currently like this:

The start date and end date in the table above are for each staff. For example, Chloe is assigned to Job A from 2 October 2022 to 21 October 2022. However, Job A has been running from 1 October 2022 to 31 October.

My goal right now is to take the minimum and maximum date of each job and put it in a new column. I want my data table to look like this now:

Note: I have to do this in Power Query Editor, I'm not that familiar with Power Query so I would appreciate all the help i can get. 

Thank You!

[hnguy71 · Accepted solution]

Hi @Afiq_Danial ,

You may try this sample:

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WcsxLqVTSUfLKT1JwBNKGBvrG+kYGRkZQtiGEE6sTreRUVJmYh6rUEEmpoQlCqXNGTn4qqlIjJKVGSKYGJxYlZkCVOoGkDfXN4UoN9Y0NEEq9EnNTi1GVGhgjqUV2gWNxRk5qJZpiSyTFcDfEAgA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [#"Staff Name" = _t, #"Job Name" = _t, #"Start Date" = _t, #"End Date" = _t]),
    DefaultDataTypes = Table.TransformColumnTypes(Source,{{"Start Date", type date}, {"End Date", type date}}),

    // start from here. Find your min and max dates for specific job.
    FindMinMax = Table.AddColumn(DefaultDataTypes, "Custom", each 
    let 
        getJobs = [Job Name],
        selectJobs = Table.SelectRows(DefaultDataTypes, each ([Job Name] = getJobs)),
        minMax = Table.Group(selectJobs, {"Job Name"}, { {"Start Job Duration", each List.Min([Start Date]), type nullable date}, {"End Job Duration", each List.Max([End Date]), type nullable date}  })
    in
        minMax
    ),
    
    // expand
    ExpandMinMax = Table.ExpandTableColumn(FindMinMax, "Custom", {"Start Job Duration", "End Job Duration"}, {"Start Job Duration", "End Job Duration"}),
    ChangeDateType = Table.TransformColumnTypes(ExpandMinMax,{{"Start Job Duration", type date}, {"End Job Duration", type date}})
in
    ChangeDateType

Here's the output of that:

EDIT: Attaching sample pbix just in case.

[Afiq_Danial]

Thank you so much, it works! Appreciate it