Forum Discussion
How to summarize columns using Power Query Editor NOT DAX
Hi all, I need a query that summarizes and generates a row for every date and all 99 MSOAs (geographical) area from my source table. For context I have a large dataset of records with a date and ...
Hi Anonymous
Ok, it is all about the dates, so let's extract the min and max date in the original data, then generate every single day in between, have a try
let Source = Table.Group(Table.SelectColumns(Pos_Case_DPH_2,{"Preferred MSOA Name", "Specimen Date", "Count"}), {"Preferred MSOA Name", "Specimen Date"}, {{"Count", each List.Sum([Count]), type nullable number}}), Date = List.Transform( { Number.From(List.Min(Source[Specimen Date]))..Number.From(List.Max(Source[Specimen Date]))}, Date.From), MSOA = Table.FromList( List.Distinct(Source[Preferred MSOA Name])), #"Renamed Columns" = Table.RenameColumns(MSOA,{{"Column1", "Preferred MSOA Name"}}), #"Added Custom" = Table.AddColumn(#"Renamed Columns", "Specimen Date", each Date), #"Expanded Date" = Table.ExpandListColumn(#"Added Custom", "Specimen Date"), #"Merged Queries" = Table.NestedJoin(#"Expanded Date", {"Preferred MSOA Name", "Specimen Date"}, Source, {"Preferred MSOA Name", "Specimen Date"}, "Expanded Date", JoinKind.LeftOuter), #"Expanded Expanded Date" = Table.ExpandTableColumn(#"Merged Queries", "Expanded Date", {"Count"}, {"Count"}), #"Replaced Value" = Table.ReplaceValue(#"Expanded Expanded Date",null,"0",Replacer.ReplaceValue,{"Count"}) in #"Replaced Value"
Hi Anonymous
Understood, so sum up the Count first, try it
let
Source = Table.Group(Table.SelectColumns(Pos_Case_DPH_2,{"Preferred MSOA Name", "Specimen Date", "Count"}), {"Preferred MSOA Name", "Specimen Date"}, {{"Count", each List.Sum([Count]), type nullable number}}),
Date = List.Distinct( Source[Specimen Date]),
MSOA = Table.FromList( List.Distinct(Source[Preferred MSOA Name])),
#"Renamed Columns" = Table.RenameColumns(MSOA,{{"Column1", "Preferred MSOA Name"}}),
#"Added Custom" = Table.AddColumn(#"Renamed Columns", "Specimen Date", each Date),
#"Expanded Date" = Table.ExpandListColumn(#"Added Custom", "Specimen Date"),
#"Merged Queries" = Table.NestedJoin(#"Expanded Date", {"Preferred MSOA Name", "Specimen Date"}, Source, {"Preferred MSOA Name", "Specimen Date"}, "Expanded Date", JoinKind.LeftOuter),
#"Expanded Expanded Date" = Table.ExpandTableColumn(#"Merged Queries", "Expanded Date", {"Count"}, {"Count"}),
#"Replaced Value" = Table.ReplaceValue(#"Expanded Expanded Date",null,"0",Replacer.ReplaceValue,{"Count"})
in
#"Replaced Value"Hi Anonymous that has worked to get the count column thank you. The only thing missing is still the lack of rows for every single date. I've taken a snip of the table when sorted in acending order by date. You can see there are rows for the 3rd March 2020 and the 5th March 2020 but the query hasn't generated rows for the 4th March and other dates when there isn't a case in any single MSOA on that date. The 4th March ideally should have 99 rows that have a count of 0. Is that possible? Thanks.