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richard-powerbi's avatar
richard-powerbi
Post Patron
6 years ago
Solved

How to remove and add keys? Table.ReplaceKeys how does it work?

I have a SQL table loaded in PBI. I want to create my own primary keys and qualify them as keys in PBI.

The documentation on Table.ReplaceKeys is really bad. Can anyone explain how it works? Or is there another way of doing this?

Need Help
  • dax's avatar
    dax
    6 years ago

    Hi richard-powerbi , 

    It seems to change key, you could try below M code and refer to power-query-m-primer-part13-tables-table-think-ii  and this post  for details.

    let

   
  
  Source = #table(
    {"CompanyID", "Name", "Location"}, 
      {
        {1, "ABC Company", "Chicago"}, 
        {2, "ABC Company", "Charlotte"}, 
        {3, "Some Other Company", "Cincinnati"}
      }
    ),
  KeysTagged = Table.AddKey(Source, {"CompanyID"}, true),
  aa=Table.ReplaceKeys(
        KeysTagged,
        {
            [Columns = {"Location"},
            Primary = true]
        }
    )
in
 Table.Keys(aa)

    Best Regards,
    Zoe Zhi

    If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

4 Replies

  • dax's avatar
    dax
    Community Support
    6 years ago

    Hi richard-powerbi , 

    It seems to change key, you could try below M code and refer to power-query-m-primer-part13-tables-table-think-ii  and this post  for details.

    let

   
  
  Source = #table(
    {"CompanyID", "Name", "Location"}, 
      {
        {1, "ABC Company", "Chicago"}, 
        {2, "ABC Company", "Charlotte"}, 
        {3, "Some Other Company", "Cincinnati"}
      }
    ),
  KeysTagged = Table.AddKey(Source, {"CompanyID"}, true),
  aa=Table.ReplaceKeys(
        KeysTagged,
        {
            [Columns = {"Location"},
            Primary = true]
        }
    )
in
 Table.Keys(aa)

    Best Regards,
    Zoe Zhi

    If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.

    • richard-powerbi's avatar
      richard-powerbi
      Post Patron
      6 years ago

      Another question, is below code correct if I want two columns to act as one composite key? Both columns do not have unique values, only the combination of them is unique.

       

      = Table.ReplaceKeys(Source, {[Columns = List.Combine({{"Column1"}, {"Column2"}), Primary = true]})

       

      Later on I will merge on these two columns and I would like this utilize this for performance. Does above code work for this?

      dax