Beast Mode Help: Two layers of division

swagner
swagner Contributor
in Magic ETL

I've got a calculation I am trying to perform with a beast mode formula, that I can't get to work.  

 

The calculation is (Number of Lines / Hours Active) / Standard  

 

I'm trying to protect against divide by zero in the two layers of the formula.  The first item in the order of operation is the (Number of Lines / Hours Active), then the result of that calculation is / Standard  

 

Here is the beast mode I attempted, but is not working.  I know this case is checking for NULL, do I need to check for zero as well?

 

CASE
WHEN IFNULL(SUM(`RCV Standard - Dynamic`),0)=0
THEN 0
ELSE

(CASE
WHEN IFNULL(SUM(`RCV Time Active`),0)=0
THEN 0
ELSE

(SUM(`RCV Number of Lines`)/SUM(`RCV Time Active`))/`RCV Standard - Dynamic`

END)
END

Best Answer

  • BCorless
    BCorless Domo Employee
    Answer ✓

    @swagner

    Another option is to do a nested CASE statement to account for the divide by zero in both divisors:

     

    CASE
    WHEN IFNULL(`Standard`,0) = 0 THEN 0
    ELSE


    (CASE
    WHEN IFNULL(`Hours Active`,0) = 0 THEN 0
    ELSE (IFNULL(Number of Lines,0) / IFNULL(Hours Active,0))
    END) / IFNULL(`Standard`,0)

     

    END

    If I have answered your question, please click "Yes" on my comment's option.

Answers

  • Tomo
    Tomo Contributor

    Hi.
    Please try using nullif and ifnull.


    Original

    (Number of Lines / Hours Active) / Standard

     

    Standard = 0 -> null

    (Number of Lines / Hours Active) / nullif(Standard,0)

     

    0 or null -> 0

    ifnull((Number of Lines / Hours Active) / nullif(Standard,0),0)

  • swagner
    swagner Contributor

    I've tried a few times without success to change my existing Beast Mode to include what you've suggested and I cannot get it to work.  Can you show me the completed Beast Mode instead of just those suggested lines please?

  • RGranada
    RGranada Contributor

    Hi @swagner,

     

    If I correctly understood your problem... Have you tried using just nullif? Divisions by 0 do raise an error but division by null equals null (This is what I systematically use), so in your case, I would go with :

     

    (Number of Lines / NULLIF(Hours Active,0)) / NULLIF(Standard,0)

     

    This way no divisor will ever be zero.

    In the end, you can always revert to zero if the result is null (I do not agree with this approach as a division by zero tends to an infinite number, not a zero! But some people follow this)

     

    IFNULL((Number of Lines / NULLIF(Hours Active,0)) / NULLIF(Standard,0),0)

     

    Hope this helps.

    Ricardo Granada 

    MajorDomo@Lusiaves

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  • BCorless
    BCorless Domo Employee
    Answer ✓

    @swagner

    Another option is to do a nested CASE statement to account for the divide by zero in both divisors:

     

    CASE
    WHEN IFNULL(`Standard`,0) = 0 THEN 0
    ELSE


    (CASE
    WHEN IFNULL(`Hours Active`,0) = 0 THEN 0
    ELSE (IFNULL(Number of Lines,0) / IFNULL(Hours Active,0))
    END) / IFNULL(`Standard`,0)

     

    END

    If I have answered your question, please click "Yes" on my comment's option.

  • Tomo
    Tomo Contributor

    I forgot to nullif to "Hours Active".

     

    Original
    (Number of Lines / Hours Active) / Standard

     

    Standard = 0 -> null
    (Number of Lines / nullif(Hours Active,0)) / nullif(Standard,0)
    or
    (sum(Number of Lines) / nullif(sum(Hours Active),0)) / nullif(sum(Standard),0)

     

    0 or null -> 0
    ifnull((Number of Lines / nullif(Hours Active,0)) / nullif(Standard,0),0)
    or
    ifnull((sum(Number of Lines) / nullif(sum(Hours Active),0)) / nullif(sum(Standard),0),0)

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