extract minimum and maximum in a category?

Hello Anonymous ,

Use Table.Group for this and select Min and Max for the Date-column .

Here a code example

let
	Source = #table
	(
		{"Project","Date"},
		{
			{"A","43466"},	{"A","43467"},	{"A","43468"},	{"A","43469"},	{"B","43470"},	{"B","43471"},	{"B","43472"},	{"B","43473"},	{"B","43474"},	{"C","43475"},	
			{"C","43476"},	{"C","43477"},	{"C","43478"}
		}
	),
    ToDate = Table.TransformColumns
    (
        Source,
        {
            {
                "Date",
                each Date.From(Number.From(_)),
                type date
            }
        }
    ),
    Group = Table.Group(ToDate, {"Project"}, {{"Min", each List.Min([Date]), type date}, {"Max", each List.Max([Date]), type date}})
in
	Group

Copy paste this code to the advanced editor in a new blank query to see how the solution works. 

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Have fun

Jimmy