I am trying to calculate the difference between values in the same column on 2 different dates

user03781 · 2021-04-27T21:47:25+00:00

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user03781

I only have 3 dimensions and one measure.

Dimensions:

Date

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GrantSmith

Hi @user03781

Have you tried using a LAG or LEAD window function? They'll get you the value from the row before or after respective

You can then take the rank difference between the two dates.

I did a write up on them here: https://dojo.domo.com/discussion/52679/domo-ideas-conference-beast-modes-rolling-averages

Salmas

Hi,

I'm facing a similar issue. In my case, I wanted to see the difference between two dates in the same column. I have a Rank column also. I have used the beast mode calculation as

(Case when 'rank' = 2 then 'date' end) - (Case when 'rank' = 1 then 'date' end)

But this is not giving any data, the output is just blank. Let me know, if any solution are there?

Thanks

GrantSmith

Hi @Salmas

Beast modes are evaluated on a row basis and typically don't know of other rows. So in your case it won't ever see a row with rank 1 if it's on the row of rank 2. When you subtract NULL from something the ending result is NULL which is why you have blank output.

You'd need to use the LAG (prior) or LEAD (next) function to get the appropriate value you want to evaluate. Make sure you order your data correctly with your lag/lead function otherwise you'll get unexpected results.

Here's a post I did on rolling average which might give you some additional insight into how LAG/LEAD work.

Domo IDEAs Conference - Beast Modes - Rolling Averages

If you don't have access to the LAG and LEAD functions in a beast mode you might need to talk with your CSM to get it enabled.

tejusarora

@Salmas i would try using datediff instead of minus (-) operand. That might work.