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Earliest Date|Power Query|Excel Forum|My Online Training Hub

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sp_CrumbsHome HomeExcel ForumPower QueryEarliest Date
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Earliest Date
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Ken Gulick

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April 11, 2020 - 2:29 am
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I am trying to get the earliest date / minimum value from a field (in power query).

In my data table in an Excel table, each  line/record has a stamp date for when the row occurs. I want to add a new column that shows the earliest start date.

How can I do that in Power Query?

row    stamp date    start date
1       3-31-20         3-31-20
2       4-1-20           3-31-20
3       4-2-20           3-31-20
4       4-3-20           3-31-20
5       3-31-20         3-31-20
6       4-1-20           3-31-20
7       3-31-20         3-31-20

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Mynda Treacy
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April 11, 2020 - 8:18 pm
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Hi Ken,

Add a custom column that returns the 'List.Min' for the Stamp Date column. The formula looks like this:

=List.Min(#"Changed Type with Locale"[#"stamp date"])

Remember, Power Query is case sensitive so you may need to change the column name to suit. You'll also need to change the last step reference to suit your query.

Mynda

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Ken Gulick

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April 14, 2020 - 3:03 am
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That's what I did, but it returned the date of the record.

Since it did not work with DateTime, I tried Date, and then record Index.  Same result.  File attached.

let
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
#"Changed Type" = Table.TransformColumnTypes(Source,{{"OpCenter", type text}, {"item", type text}, {"start", type datetime}, {"stop", type datetime}}),
#"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 0, 1),
#"Added Custom3" = Table.AddColumn(#"Added Index", "Min Index", each List.Min({[Index]})),
#"Added Custom" = Table.AddColumn(#"Added Custom3", "Min Start", each List.Min({[start]})),
#"Added Custom2" = Table.AddColumn(#"Added Custom", "Start Date", each DateTime.Date([start])),
#"Changed Type1" = Table.TransformColumnTypes(#"Added Custom2",{{"Start Date", type date}}),
#"Added Custom1" = Table.AddColumn(#"Changed Type1", "Min Start Date", each List.Min({[Start Date]}))
in
#"Added Custom1"

What am I missing?

Thanks,

Ken

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Mynda Treacy
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April 14, 2020 - 9:17 am
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Hi Ken,

Our formulas are not the same. Your formula is:

=List.Min({[start]})

Mine is:

=List.Min(#"Changed Type"[#"start"])

Replace your "Added Custom" step formula with the one above.

This yields a different result (i.e. April 8, 2020 7:00:00 AM) because it's referring to a step, not just a record.

Mynda

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