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MarcF's avatar
MarcF
Advocate IV
10 years ago
Solved

Best way to fix missing days for currency conversion API

Hi all,   I am looking for a best practice to fill missing days with my €/£ Quandl currency conversion API. The API feeds in currecny conversion for week days but returns null values during weekend...
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  • Eric_Zhang's avatar
    Eric_Zhang
    10 years ago

    MarcF

     

    Supposing the dataset is as below.

     

     

    Check a measure as

     

    Currency = 
VAR lastNoBlankValDate =
    MAXX (
        FILTER (
            ALL ( EURvsGBP ),
            EURvsGBP[DATE] <= MAX ( EURvsGBP[DATE] )
                && EURvsGBP[VALUE] <> BLANK ()
        ),
        EURvsGBP[DATE]
    )
RETURN
    CALCULATE (
        SUM ( EURvsGBP[VALUE] ),
        FILTER ( ALL ( EURvsGBP ), EURvsGBP[DATE] = lastNoBlankValDate )
    )

     

     

     

    Regarding week-based, check if Week-Based Time Intelligence in DAX helps.

Eric_Zhang's avatar
Eric_Zhang
Microsoft Employee
10 years ago

MarcF

 

Supposing the dataset is as below.

 

 

Check a measure as

 

Currency = 
VAR lastNoBlankValDate =
    MAXX (
        FILTER (
            ALL ( EURvsGBP ),
            EURvsGBP[DATE] <= MAX ( EURvsGBP[DATE] )
                && EURvsGBP[VALUE] <> BLANK ()
        ),
        EURvsGBP[DATE]
    )
RETURN
    CALCULATE (
        SUM ( EURvsGBP[VALUE] ),
        FILTER ( ALL ( EURvsGBP ), EURvsGBP[DATE] = lastNoBlankValDate )
    )

 

 

 

Regarding week-based, check if Week-Based Time Intelligence in DAX helps.

  • MarcF's avatar
    MarcF
    Advocate IV
    10 years ago

    Thanks, that works just great! I was wondering now what is the best database modelling practice for currency conversion data. At the moment I have three tables linked by 'Date':

     

    CurrencyTable --- DateTable --- Sales

     

    I have created a currency column in the DataTable with the exchange rate for the missing dates (as the CurrencyTable has no dates for weekends and bank holidays) and call it back in the sales table through a lookup. Is there a better way to do this?

  • anandav's avatar
    anandav
    Skilled Sharer
    8 years ago

    Eric_Zhang,

    Had a similar problem and your solution helped solve it.

    Great work.

  • anandav's avatar
    anandav
    Skilled Sharer
    8 years ago

    Eric_Zhang,

     

    How can this be achieved in a calculated column?

     

    The measure is working but I am trying to create a calculated column to fill the missing values.

     

    Any help will be appreciated.