Custom Column with Complex Conditions

Hi, I need some help with creating a custom column in Power Query. I need to do a lot with this column afterwards, so it can't be done with DAX, it has to be done in Power Query. The conditions for ...

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smpa01

6 years ago

should work

let
    Source = Web.BrowserContents("https://community.powerbi.com/t5/Desktop/Custom-Column-with-Complex-Conditions/td-p/951289"),
    #"Extracted Table From Html" = Html.Table(Source, {{"Column1", "TABLE:nth-child(7) > * > TR > :nth-child(1)"}, {"Column2", "TABLE:nth-child(7) > * > TR > :nth-child(2)"}, {"Column3", "TABLE:nth-child(7) > * > TR > :nth-child(3)"}, {"Column4", "TABLE:nth-child(7) > * > TR > :nth-child(4)"}, {"Column5", "TABLE:nth-child(7) > * > TR > :nth-child(5)"}}, [RowSelector="TABLE:nth-child(7) > * > TR"]),
    #"Promoted Headers" = Table.PromoteHeaders(#"Extracted Table From Html", [PromoteAllScalars=true]),
    #"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{{"Column1", Int64.Type}, {"Column2", type text}, {"Column3", type text}, {"Column4", type text}, {"Column5", Int64.Type}}),
 #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 1, 1),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Column 2 status", each if [Column2]="" then "blank" else "Not Blank"),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "Custom", each if [Column 2 status]="Not Blank" then "lookup c1 by c2" else "lookup c2 by c3+c4-> lookup c1 by c2+c4"),
    #"Merged Queries" = Table.NestedJoin(#"Added Custom1", {"Column3", "Column4"}, #"Added Custom1", {"Column2", "Column4"}, "Added Custom1", JoinKind.LeftOuter),
    #"Expanded Added Custom1" = Table.ExpandTableColumn(#"Merged Queries", "Added Custom1", {"Column2"}, {"Column2.1"}),
    #"Merged Queries1" = Table.NestedJoin(#"Expanded Added Custom1", {"Column2.1", "Column4"}, #"Expanded Added Custom1", {"Column2", "Column4"}, "Expanded Added Custom1", JoinKind.LeftOuter),
    #"Expanded Expanded Added Custom1" = Table.ExpandTableColumn(#"Merged Queries1", "Expanded Added Custom1", {"Column1"}, {"Column1.1"}),
    #"Filtered Rows" = Table.SelectRows(#"Expanded Expanded Added Custom1", each ([Custom] = "lookup c2 by c3+c4-> lookup c1 by c2+c4")),
    Custom1 = Table.SelectRows(#"Expanded Expanded Added Custom1", each ([Custom] <> "lookup c2 by c3+c4-> lookup c1 by c2+c4")),
    #"Removed Columns" = Table.RemoveColumns(Custom1,{"Column1.1"}),
    #"Added Custom2" = Table.AddColumn(#"Removed Columns", "Column1.1", each [Column1]),
    Custom2 = #"Filtered Rows"&#"Added Custom2",
    #"Sorted Rows" = Table.Sort(Custom2,{{"Index", Order.Ascending}}),
    #"Removed Other Columns" = Table.SelectColumns(#"Sorted Rows",{"Column1", "Column2", "Column3", "Column4", "Index", "Column1.1"}),
    #"Removed Duplicates" = Table.Distinct(#"Removed Other Columns", {"Index"})
in
    #"Removed Duplicates"

smpa01

Community Champion

6 years ago

yes, there is no combination for D11(c2)Z14(c4), C2(c2)Y5(c4) and E15(c2)X1(c4) in the first table that you provided

Column1	Column2	Column3	Column4	Index	Column1.1
8		D11	Z14	3	null
22		C2	Y5	4	null
943		E15	X1	6	null

Anonymous

Not applicable

6 years ago

smpa01

Sorry, the initial table should have been:

Column1	Column2	Column3	Column4
1		B3	X11
67		B3	X19
8		A3	X41
22		C2	Y5
2		A1	Y15
943		D3	Y5
378		C1	Z11
65		C1	Y3
1	B3		X19
33	B3		X11
68	C1		Y3
452	A1		Y15
8	C2		Y5
43	A3		X41
9	C1		Z11
67	D3		Y5

smpa01

Community Champion

6 years ago

Anonymous No worries. My solution is still valid. Use the same code but change the data source to the new table in the first line.If you don't see what you expect to see please give me a buzz.

Anonymous

Not applicable

6 years ago

smpa01

I ended up with a bunch of extra rows.

let
    Source = Web.BrowserContents("https://community.powerbi.com/t5/Desktop/Custom-Column-with-Complex-Conditions/m-p/951289#M455818"),
    #"Extracted Table From Html" = Html.Table(Source, {{"Column1", "TABLE:nth-child(3) > * > TR > :nth-child(1)"}, {"Column2", "TABLE:nth-child(3) > * > TR > :nth-child(2)"}, {"Column3", "TABLE:nth-child(3) > * > TR > :nth-child(3)"}, {"Column4", "TABLE:nth-child(3) > * > TR > :nth-child(4)"}}, [RowSelector="TABLE:nth-child(3) > * > TR"]),
    #"Removed Top Rows" = Table.Skip(#"Extracted Table From Html",22),
    #"Changed Type" = Table.TransformColumnTypes(#"Removed Top Rows",{{"Column1", Int64.Type}, {"Column2", type text}, {"Column3", type text}, {"Column4", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 1, 1),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Column 2 status", each if [Column2]="" then "blank" else "Not Blank"),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "Custom", each if [Column 2 status]="Not Blank" then "lookup c1 by c2" else "lookup c2 by c3+c4-> lookup c1 by c2+c4"),
    #"Merged Queries" = Table.NestedJoin(#"Added Custom1", {"Column3", "Column4"}, #"Added Custom1", {"Column2", "Column4"}, "Added Custom1", JoinKind.LeftOuter),
    #"Expanded Added Custom1" = Table.ExpandTableColumn(#"Merged Queries", "Added Custom1", {"Column2"}, {"Column2.1"}),
    #"Merged Queries1" = Table.NestedJoin(#"Expanded Added Custom1", {"Column2.1", "Column4"}, #"Expanded Added Custom1", {"Column2", "Column4"}, "Expanded Added Custom1", JoinKind.LeftOuter),
    #"Expanded Expanded Added Custom1" = Table.ExpandTableColumn(#"Merged Queries1", "Expanded Added Custom1", {"Column1"}, {"Column1.1"}),
    #"Filtered Rows" = Table.SelectRows(#"Expanded Expanded Added Custom1", each ([Custom] = "lookup c2 by c3+c4-> lookup c1 by c2+c4")),
    Custom1 = Table.SelectRows(#"Expanded Expanded Added Custom1", each ([Custom] <> "lookup c2 by c3+c4-> lookup c1 by c2+c4")),
    #"Removed Columns" = Table.RemoveColumns(Custom1,{"Column1.1"}),
    #"Added Custom2" = Table.AddColumn(#"Removed Columns", "Column1.1", each [Column1]),
    Custom2 = #"Filtered Rows"&#"Added Custom2",
    #"Sorted Rows" = Table.Sort(Custom2,{{"Index", Order.Ascending}}),
    #"Removed Other Columns" = Table.SelectColumns(#"Sorted Rows",{"Column1", "Column2", "Column3", "Column4", "Index", "Column1.1"})
in
    #"Removed Other Columns"

I see the primary tactic, which is merging a table with itself (brilliant!), but now I can't figure out why I end up with so many extra rows.

smpa01

Community Champion

6 years ago

with this

let
    Source = Web.BrowserContents("https://community.powerbi.com/t5/Desktop/Custom-Column-with-Complex-Conditions/m-p/951289#M455818"),
    #"Extracted Table From Html" = Html.Table(Source, {{"Column1", "TABLE:nth-child(3) > * > TR > :nth-child(1)"}, {"Column2", "TABLE:nth-child(3) > * > TR > :nth-child(2)"}, {"Column3", "TABLE:nth-child(3) > * > TR > :nth-child(3)"}, {"Column4", "TABLE:nth-child(3) > * > TR > :nth-child(4)"}}, [RowSelector="TABLE:nth-child(3) > * > TR"]),
    #"Promoted Headers" = Table.PromoteHeaders(#"Extracted Table From Html", [PromoteAllScalars=true]),
    #"Changed Type" = Table.TransformColumnTypes(#"Promoted Headers",{{"Column1", Int64.Type}, {"Column2", type text}, {"Column3", type text}, {"Column4", type text}}),
    #"Added Index" = Table.AddIndexColumn(#"Changed Type", "Index", 1, 1),
    #"Added Custom" = Table.AddColumn(#"Added Index", "Column 2 status", each if [Column2]="" then "blank" else "Not Blank"),
    #"Added Custom1" = Table.AddColumn(#"Added Custom", "Custom", each if [Column 2 status]="Not Blank" then "lookup c1 by c2" else "lookup c2 by c3+c4-> lookup c1 by c2+c4"),
    #"Merged Queries" = Table.NestedJoin(#"Added Custom1", {"Column3", "Column4"}, #"Added Custom1", {"Column2", "Column4"}, "Added Custom1", JoinKind.LeftOuter),
    #"Expanded Added Custom1" = Table.ExpandTableColumn(#"Merged Queries", "Added Custom1", {"Column2"}, {"Column2.1"}),
    #"Merged Queries1" = Table.NestedJoin(#"Expanded Added Custom1", {"Column2.1", "Column4"}, #"Expanded Added Custom1", {"Column2", "Column4"}, "Expanded Added Custom1", JoinKind.LeftOuter),
    #"Expanded Expanded Added Custom1" = Table.ExpandTableColumn(#"Merged Queries1", "Expanded Added Custom1", {"Column1"}, {"Column1.1"}),
    #"Filtered Rows" = Table.SelectRows(#"Expanded Expanded Added Custom1", each ([Custom] = "lookup c2 by c3+c4-> lookup c1 by c2+c4")),
    Custom1 = Table.SelectRows(#"Expanded Expanded Added Custom1", each ([Custom] <> "lookup c2 by c3+c4-> lookup c1 by c2+c4")),
    #"Removed Columns" = Table.RemoveColumns(Custom1,{"Column1.1"}),
    #"Added Custom2" = Table.AddColumn(#"Removed Columns", "Column1.1", each [Column1]),
    Custom2 = #"Filtered Rows"&#"Added Custom2",
    #"Sorted Rows" = Table.Sort(Custom2,{{"Index", Order.Ascending}}),
    #"Removed Other Columns" = Table.SelectColumns(#"Sorted Rows",{"Column1", "Column2", "Column3", "Column4", "Index", "Column1.1"})
in
    #"Removed Other Columns"

you are only ending up with one extra column which you can always kill

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