topic Re: How to deduct two sums in Splunk Search

How to deduct two sums

highriser666 — Sun, 17 Jan 2016 20:42:39 GMT

I am trying to sum 2 Fields of a search and then deduct the one from the other:

my idea is not working:

| stats sum( eval (stats sum(Field1)) - (stats( sum(Field2)) ) AS difference12

Re: How to deduct two sums

MuS — Mon, 18 Jan 2016 02:40:13 GMT

Hi highriser666,

take this run everywhere command as example:

 index=_internal | stats sum(kb) AS KB sum(kbps) AS KBPS | eval diff=KB-KBPS

You frist have to sum() your fields (here it is kb and kbps) and then evaluate the difference.

Hope this helps ...

cheers, MuS

Re: How to deduct two sums

s2_splunk — Mon, 18 Jan 2016 02:41:14 GMT

How about:

| stats sum(Field1) as Sum1, sum(Field2) as Sum2 | eval difference12 = Sum1-Sum2

Re: How to deduct two sums

highriser666 — Mon, 18 Jan 2016 08:26:40 GMT

Thank you,

I tried is already before getting mad with the other term.

When I do as you suggest the stats it gives me always only the sums for field1 and field2.

"Difference12" is not shown as the expected single value in the stats-tab of the results even though it should be the
singular result of the term.

Stats always only shows field1 and field2.

Currently Field2 is all time NULL could that cause an issue?

Re: How to deduct two sums

fdi01 — Mon, 18 Jan 2016 13:23:00 GMT

or you can try like :

...| timechart eval(sum(Field1)- sum(Field2)) as difference12

Re: How to deduct two sums

somesoni2 — Mon, 18 Jan 2016 15:30:40 GMT

Yes, if the value of a field is always NULL, the stats will return NULL for the Field2 and subsequent diff will also be NULL.

Try something like this

Your base search  | stats sum(Field1) AS Field1 sum(Field2) AS Field2  | fillnull value=0 Field2 | eval Difference12 =Field1 -Field1

Re: How to deduct two sums

MuS — Mon, 18 Jan 2016 20:23:17 GMT

this will not work, because sum() is not an eval function, but the other way around it will work (run everywhere example):

 index=_internal | timechart sum(eval(kb-kbps)) AS diff

But I doubt this will be the correct result, because it will not calculate the total difference. On the other hand the use case is not 100% clear so maybe it could work 😉

Re: How to deduct two sums

MuS — Mon, 18 Jan 2016 20:32:38 GMT

either do as @somesoni2 suggests or provide some sample events and your complete search. Makes it easier to help 😉