Splunk Search

## How to deduct two sums

New Member

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

Tags (4)
Motivator

or you can try like :

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

SplunkTrust

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 😉

Splunk Employee

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

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

New Member

Thank you,

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?

SplunkTrust

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

Revered Legend

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
``````
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