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Count number of unique records for each user
I have a table (tblMessage) that contains a lot of messages:
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:
Thanks for all help :)
Microsoft SQL Server
8/22/2022 - Mon
ASKER CERTIFIED SOLUTION
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:) instead of the the last line above you can use
ORDER BY Contacts DESC, Reciever
(i.e. in the ORDER By clause you can reference column aliases)
no points please; it's just that Phillip didn't leave much for anyone else to do
Quite right - the problems of answering quickly!
I've also noticed that in my Group By, the word "Receiver" was correctly spelt, whereas your field name is "Reciever".
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