Using division operator in app insight analytics - azure

Question

I have the following app insights query :
let someResult=
customEvents | where name in ('SomeAction')
| parse customDimensions.someId with someId
| parse customDimensions.sometaskId with someTaskId
| parse user_AuthenticatedId with user
| summarize max(timestamp) by user, someId , someTaskId
| join (
customEvents | where name in ('someAction')
| parse customDimensions.action with someAction
| parse customDimensions.someId with someId
| project someAction,someId
) on someId
| join (
customEvents
| where name in ('someResult')
| parse customDimensions.someId with someId
| parse customDimensions.someIdsWithSomething with sometaskIds
| parse array_length(split(customDimensions.someIdsWithSomething ,',')) with someTaskCount
| distinct someId , sometaskIds,someTaskCount
| where sometaskIds<> ''
) on someId
| summarize sumif(todouble(someTaskCount),someAction=="accept")/sum(todouble(someTaskCount));
How can i divide someResult by something here . For example i want the final result to be someResult/10 . Thank you for the help.

Answer 1

Try this:
let someResult=
customEvents | where name in ('SomeAction')
| parse customDimensions.someId with someId
| parse customDimensions.sometaskId with someTaskId
| parse user_AuthenticatedId with user
| summarize max(timestamp) by user, someId , someTaskId
| join (
customEvents | where name in ('someAction')
| parse customDimensions.action with someAction
| parse customDimensions.someId with someId
| project someAction,someId
) on someId
| join (
customEvents
| where name in ('someResult')
| parse customDimensions.someId with someId
| parse customDimensions.someIdsWithSomething with sometaskIds
| parse array_length(split(customDimensions.someIdsWithSomething ,',')) with someTaskCount
| distinct someId , sometaskIds,someTaskCount
| where sometaskIds<> ''
) on someId
| summarize summarized = sumif(todouble(someTaskCount),someAction=="accept")/sum(todouble(someTaskCount));
someResult
| project summarized / 10
I could not test it since I do not have those custom dimensions but it is based from this working/tested example:
let someResult = requests
| summarize summarized = count();
someResult
| project summarized / 10

Answer 2

I hope this helps someone, as this SO question shows up as the top result but doesn't answer the question. I determined something like this from this answer:
let authRequests = requests | where operation_Name contains "Auth";
let countNon500s = toscalar(authRequests | where resultCode !startswith "5" | count);
let countAll = toscalar(authRequests | count);
let percent = 100*todouble(todouble(countNon500s) / todouble(countAll));
print todecimal(percent)
The three important parts are:
you need to convert the values to scalar values (otherwise they are tables).
you need to convert the resulting percentage to doubles (otherwise they are 1 or 0)
you need to use 'print' to output to a tabular form (or extend a column)