troubleshooting Question

Count number of unique records for each user

Avatar of webressurs
webressursFlag for Norway asked on
Microsoft SQL ServerSQL
3 Comments1 Solution184 ViewsLast Modified:
I have a table (tblMessage) that contains a lot of messages:

id
Text
Sender
Reciever
SiteId

I need to make a SQL that list out how many unique persons (Sender) that has contacted each user (Reciever), where siteId = [number], ordered by number of unique contacts.

Example: If a person (reciever) has got 2 messages from Jesscia, 2 messages from Lisa and 4 Messages from Mike, this should be counted as 3 (3 unique contacts).

The final result shoud be something like this:

Reciever   Contacts
------------------------------------
Jimmi        20
Sarah        12
Mike          11
Andrew     8
Lisa            5
Jessica       3
Jason         0

Thanks for all help :)
ASKER CERTIFIED SOLUTION
Join our community to see this answer!
Unlock 1 Answer and 3 Comments.
Start Free Trial
Learn from the best

Network and collaborate with thousands of CTOs, CISOs, and IT Pros rooting for you and your success.

Andrew Hancock - VMware vExpert
See if this solution works for you by signing up for a 7 day free trial.
Unlock 1 Answer and 3 Comments.
Try for 7 days

”The time we save is the biggest benefit of E-E to our team. What could take multiple guys 2 hours or more each to find is accessed in around 15 minutes on Experts Exchange.

-Mike Kapnisakis, Warner Bros