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Anonymous's avatar
Anonymous
Not applicable
3 years ago
Solved

Operators in Power Query M

Hi,

 

I can use the operators = and <> between two dates.  But I get an error when I use <, >, >= or <=.  I have both my fields are a Date data type.  

 

Expression.Error: We cannot apply operator < to types List and Date.
Details:
Operator=<
Left=[List]
Right=2021-05-31

 

 

Need Help
  • BA_Pete's avatar
    BA_Pete
    3 years ago

     

    Are you trying to apply this comparison across different tables? If you are then, yes, you will need to provide row context for the calculation for the remote table.

    If you're making the comparison across two columns in the same table then the row context should be implicit, and there's another issue at play.

     

    Pete

3 Replies

  • BA_Pete's avatar
    BA_Pete
    Super User
    3 years ago

    Hi Anonymous ,

     

    Power Query quite clearly thinks that one of your dates is actually a list:

     

     

    You need to ensure that both columns only contain dates in every row.

     

    Pete

    • Anonymous's avatar
      Anonymous
      Not applicable
      3 years ago

      Every row only have dates.

      I think I found my problem. Even if it's a table containing only one row, I still need to identify that row. Without identifying the row it reads it has a list.

      Thanks

      • BA_Pete's avatar
        BA_Pete
        Super User
        3 years ago

         

        Are you trying to apply this comparison across different tables? If you are then, yes, you will need to provide row context for the calculation for the remote table.

        If you're making the comparison across two columns in the same table then the row context should be implicit, and there's another issue at play.

         

        Pete