count of of users by vendor for current day

[jay3828]

Hello hacking my way through learning power bi.  I have a slider that is based on Vendors and a pie chart that I would like to provide the count of users that are related to a vendor where datetable_dim = today.  
so I am looking to create a measure that would count the number of users in the fact table related to the vendor when the date is = to today?  in sql this is simple. in dax it is braking my brain.  but I want to learn dax.
sample sql
select count(distinct rtt.username) as _cnt, fc.vendororganizationname as vendor
from CTX_SESSIONRTT_UTC rtt
inner join persona fc on lower(rtt.username) = lower(fc.domainuserid)
where rtt.sessionstartdate = current_date() and rtt.sessionstarttime is not null and rtt.sessionkey is not null
and length(fc.vendororganizationname) > 1
and length(rtt.username) > 1
and rtt.username is not null
group by vendor
order by vendor;
 

[v-binbinyu-msft]

Hi @jay3828 ,

In order to better understand your demands and give the right solution, could you please provide some more specific information? such as your desensitized example data and a screenshot of your desired results?

Thanks for your efforts & time in advance.

Best regards,
Community Support Team_Binbin Yu