Forum Discussion

Anonymous's avatar
Anonymous
Not applicable
3 years ago
Solved

Dynamic Filter or Query table based on column name in another table (or list)?

In Power Query, is there a way to dynamically filter (or merge) a primary table based on a column name (and values) found in another table (or list)?

 

Hopefully this visual helps understand my question:

 

Main Table (to filter):

RowNumberTier1Tier2Details
1Tier1Val1Tier2val1blah blah 1
2Tier1Val2Tier2val2blah blah 2

 

Filter Table (where I define which column to filter or merge on, and the value to match):

FilterColumnFilterValue
Tier2Tier2val2

 

Can this be done (without pivoting or unpivoting the first column)?

 

Thanks in advance!

  • Hi Anonymous 

     

    You could use Record.Field within Table.SelectRows, copy this script into a new blank query. 

    Note that "Filters" is included in this query but you can just as easily place that in a separate query as long as you give that new query the same name OR update the name in the expression below.

    let
        Filters = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCslMLTJS0oHQZYk5RkqxsQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [FilterColumn = _t, FilterValue = _t]),
        Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUQrJTC0yDEvMgbGNyiDspJzEDAUwYagUqxOtZISk1ghJrRGKWiOl2FgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [RowNumber = _t, Tier1 = _t, Tier2 = _t, Details = _t]),
        SelectRows = Table.SelectRows( Source, each Record.Field( _, Filters{0}[FilterColumn] ) = Filters{0}[FilterValue] )
    in
        SelectRows

     

    Here's the result

     

    Ps. If this helps solve your query please mark this post as Solution, thanks!

  • Hi Anonymous ,

     

    I'd buffer your filter table column as a list and pass it into a Table.SelectRows, like this:

    Table.SelectRows(
        previousStepName,
        each List.Contains(List.Buffer(FilterTable[FilterValue]), [Tier2])
    )

     

    The advantage with this over m_dekorte 's answer, and others, is that this method will fold to the source, even if the second (filter) table isn't on the server.

    Power query will buffer the filter table column then stream it to the foldable source in the WHERE clause of the native query, making it clean, tidy, and fast.

     

    Pete

2 Replies

  • m_dekorte's avatar
    m_dekorte
    Resident Rockstar

    Hi Anonymous 

     

    You could use Record.Field within Table.SelectRows, copy this script into a new blank query. 

    Note that "Filters" is included in this query but you can just as easily place that in a separate query as long as you give that new query the same name OR update the name in the expression below.

    let
        Filters = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WCslMLTJS0oHQZYk5RkqxsQA=", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [FilterColumn = _t, FilterValue = _t]),
        Source = Table.FromRows(Json.Document(Binary.Decompress(Binary.FromText("i45WMlTSUQrJTC0yDEvMgbGNyiDspJzEDAUwYagUqxOtZISk1ghJrRGKWiOl2FgA", BinaryEncoding.Base64), Compression.Deflate)), let _t = ((type nullable text) meta [Serialized.Text = true]) in type table [RowNumber = _t, Tier1 = _t, Tier2 = _t, Details = _t]),
        SelectRows = Table.SelectRows( Source, each Record.Field( _, Filters{0}[FilterColumn] ) = Filters{0}[FilterValue] )
    in
        SelectRows

     

    Here's the result

     

    Ps. If this helps solve your query please mark this post as Solution, thanks!

  • Hi Anonymous ,

     

    I'd buffer your filter table column as a list and pass it into a Table.SelectRows, like this:

    Table.SelectRows(
        previousStepName,
        each List.Contains(List.Buffer(FilterTable[FilterValue]), [Tier2])
    )

     

    The advantage with this over m_dekorte 's answer, and others, is that this method will fold to the source, even if the second (filter) table isn't on the server.

    Power query will buffer the filter table column then stream it to the foldable source in the WHERE clause of the native query, making it clean, tidy, and fast.

     

    Pete