Forum Discussion

Anonymous's avatar
Anonymous
Not applicable
9 years ago

Fuzzy Lookup

One of the most required functionalities in terms of data transformation for Power BI is the ability to do Fuzzy Lookup on two datasets so that input text values with minor errors can still be mapped to a dimension in PowerBI.

I know best practices would redirect this to the usage of a ETL tool and take care of this in a DW etc.... but most uses cases are within the universe of Self Service BI using Excel files.

 

Let me know if there is a workaround either using M, R or other approach.

 

Thank you

Need Help

7 Replies

  • Anonymous's avatar
    Anonymous
    Not applicable
    8 years ago

    let
    Table1 = #table(type table [value = text],
    { {"spruce"}, {"cedar"}, {"birch"}, {"pine"}, {"poplar"}, {"aspen"},
    {"baobab"}, {"larch"}, {"willow"} }),

    Table2 = #table(type table [word = text],
    { {"sprce"}, {"cidar"}, {"pane"}, {"aspern"}, {"babab"} }),

    AddCol = Table.AddColumn(Table2, "Custom", each Table1),
    Expand = Table.ExpandTableColumn(AddCol, "Custom", {"value"}, {"value"}),

    FuzzyCalc = Table.AddColumn(Expand, "Prct", each
    2 * List.Count( List.Intersect(
    { Text.ToList([word]), Text.ToList([value]) } ) )
    / (List.Count(Text.ToList([word])) + List.Count(Text.ToList([value])))),

    SortRows = Table.Sort(FuzzyCalc,{{"word", Order.Ascending}, {"Prct", Order.Descending}}),
    AddIndex = Table.AddIndexColumn(SortRows, "Index", 1, 1),
    RemoveDupls = Table.Distinct(AddIndex, {"word"})
    in
    RemoveDupls

    • Anonymous's avatar
      Anonymous
      Not applicable
      9 years ago

      Binning would require me to know all the values to select... but this is dynamic and tomorrow the items may be different.

      Or am I understanding your suggestion wrong?

  • Anonymous's avatar
    Anonymous
    Not applicable
    9 years ago

    Hi Anonymous,

     

    Currently, power bi not support fuzzy lookup. Is only supported to use full query(direct support) and part query(need some additional operations to work through it).  It not support to lookup the similar result(e.g. use "abc" to find out the "aac","a1c") and search with wildcard.

     

    BTW, you can submit your requirement to ideas to help us improve the power bi.

     

    Regards,

    Xiaoxin Sheng

    • Anonymous's avatar
      Anonymous
      Not applicable
      9 years ago
      Hi Xiaoxin,

      I.know that Power BI does not have this support yet... but for example it is possible to use R to do data transformation correct?
      So imagine that in the same dataset I have two columns, one with all values and another that would have only the exact matches... Having this, my idea was to use R to fuzzy match one of the columns with the distinct values of the other one (possible values) and add a third column with the results.
      Is this possible?

      Thanks