topic Re: Find maximum value in one column where a second column meets criteria in Splunk Search

Find maximum value in one column where a second column meets criteria

bowesmana — Thu, 05 Nov 2020 00:02:32 GMT

I believe as with all things Splunk, there is more than one way to solve this

My data consists of this

What I want is to find the highest value of ml where achieved=1 and where there has not been achieved=0 in a lower value of ml.

I have worked out that this works, but I would like to see if there is a different solution as this seems a bit overly complicated

where max_ml will give the desired outcome.

Anyone else see an alternative solution. Note mvrange size can be any size, so not just 3 values.

Re: Find maximum value in one column where a second column meets criteria

renjith_nair — Thu, 05 Nov 2020 01:22:55 GMT

Does this work?

eventstats can be replaced with stats if you dont need other fields.

Re: Find maximum value in one column where a second column meets criteria

bowesmana — Thu, 05 Nov 2020 05:29:28 GMT

No that's not quite it. This image shows how the first 0 in the achieved column effectively locks the max_achieved to the level of the previous row, where the last '1' was

Like this

Essentially what I am trying to do is find the highest contiguously attained level (ml). So in the above image, even though there were 1s up to ml=8, the presence of the 0 at ml=4 means that all ml>3 are meaningless.

Re: Find maximum value in one column where a second column meets criteria

renjith_nair — Thu, 05 Nov 2020 07:04:21 GMT

Sorry, missed that part.

What about this based on the test data ?

Re: Find maximum value in one column where a second column meets criteria

bowesmana — Thu, 05 Nov 2020 20:37:05 GMT

@renjith_nair

Almost got it - yes, clearer and simpler than my original. However, your eventstats on its own is not quite sufficient to handle the all 1 case, so this is needed

| eventstats min(eval(if(achieved==0,ml-1,null()))) as max_ml max(ml) as highest_ml | eval max_ml=if(isnull(max_ml),highest_ml,max_ml)

to handle the null max_ml when all achieved values are 1.

Thanks for your help - I was stuck in too many dimensions to see the simplicity