Substract the value of the first date and last date of each year

[OscarSuarez10]

Hi @Nolock 

I have to take the first and last value of FPR of each year in the table and substract those values

For example for year 2019: 20707.28 (26/12/2019 last date of 2019)-2982.06 (31/03/2019 first date of 2019), and then for the next years that can be infinite ( 2020, 2021 2022, 2023 etc ....)

[Nolock · Accepted solution]

Hi @OscarSuarez10,

I've developed a short PowerQuery query which extracts the first and last value for every year and then substracts them.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("NcvBCQAxCATAXnyHZTWa5GoJ6b+NE8HvwNwrSiiM+skQlTdSAtZiJUZ4yyyZxGrxkkA2GhOiwLEbVsHBadjy3g8=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [TIME = _t, FPR = _t]),
    ChangedType = Table.TransformColumnTypes(Source,{{"TIME", type date}, {"FPR", Int64.Type}}),
    SortedTable = Table.Sort(ChangedType, {"TIME"}),
    MinYear = Date.Year(Table.First(SortedTable)[TIME]),
    MaxYear = Date.Year(Table.Last(SortedTable)[TIME]),
    ListOfYears = {MinYear..MaxYear},
    TableFromList = Table.FromColumns({ListOfYears}),
    ChangedTypeToType = Table.TransformColumnTypes(TableFromList,{{"Column1", Int64.Type}}),
    RenameColumn = Table.RenameColumns(ChangedTypeToType, {{"Column1", "Year"}}),
    MinOfYear = Table.AddColumn(RenameColumn, "MinOfYear", 
        (curRecord) => 
            List.First(
                Table.SelectRows(
                    SortedTable, 
                    each Date.Year([TIME]) = curRecord[Year]
                )[FPR]
            ),
        type number
    ),
    MaxOfYear = Table.AddColumn(MinOfYear, "MaxfYear", 
        (curRecord) => 
            List.Last(
                Table.SelectRows(
                    SortedTable, 
                    each Date.Year([TIME]) = curRecord[Year]
                )[FPR]
            ),
        type number
    ),
    Substract = Table.AddColumn(MaxOfYear, "Last of year - first of year", each [MaxfYear] - [MinOfYear], type number)
in
    Substract

Another possible solution would be to use Group By Year and then extract the first and last value of every group.

[Nolock · Accepted solution]

Hi @OscarSuarez10,

I've developed a short PowerQuery query which extracts the first and last value for every year and then substracts them.

let
    Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("NcvBCQAxCATAXnyHZTWa5GoJ6b+NE8HvwNwrSiiM+skQlTdSAtZiJUZ4yyyZxGrxkkA2GhOiwLEbVsHBadjy3g8=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type text) meta [Serialized.Text = true]) in type table [TIME = _t, FPR = _t]),
    ChangedType = Table.TransformColumnTypes(Source,{{"TIME", type date}, {"FPR", Int64.Type}}),
    SortedTable = Table.Sort(ChangedType, {"TIME"}),
    MinYear = Date.Year(Table.First(SortedTable)[TIME]),
    MaxYear = Date.Year(Table.Last(SortedTable)[TIME]),
    ListOfYears = {MinYear..MaxYear},
    TableFromList = Table.FromColumns({ListOfYears}),
    ChangedTypeToType = Table.TransformColumnTypes(TableFromList,{{"Column1", Int64.Type}}),
    RenameColumn = Table.RenameColumns(ChangedTypeToType, {{"Column1", "Year"}}),
    MinOfYear = Table.AddColumn(RenameColumn, "MinOfYear", 
        (curRecord) => 
            List.First(
                Table.SelectRows(
                    SortedTable, 
                    each Date.Year([TIME]) = curRecord[Year]
                )[FPR]
            ),
        type number
    ),
    MaxOfYear = Table.AddColumn(MinOfYear, "MaxfYear", 
        (curRecord) => 
            List.Last(
                Table.SelectRows(
                    SortedTable, 
                    each Date.Year([TIME]) = curRecord[Year]
                )[FPR]
            ),
        type number
    ),
    Substract = Table.AddColumn(MaxOfYear, "Last of year - first of year", each [MaxfYear] - [MinOfYear], type number)
in
    Substract

Another possible solution would be to use Group By Year and then extract the first and last value of every group.

[OscarSuarez10]

That helped me a lot, but I have to choose the max  FPR month value and min month FPR value of each year and then substract them...

[OscarSuarez10]

Okey, Thank You !!

[OscarSuarez10]

Sorry, I don´t understand, What is "curRecord"?

[Nolock · Accepted solution]

Hi @OscarSuarez10,

the (curRecord) => functionBody is an anonymous function which I've used instead of each. Check the following slide, it should explain it.

[Nolock]

It seaches for the minimum and maximum TIME value of a year and then takes the corresponding FPR value. It is the behaviour from your example. Is it wrong?