Question

I have a table of users with three columns.

Username    Accepted    Rejected 

User 1      1            NULL 
User 1      1            NULL 
User 1      NULL         1
User 2      1            1
User 3      1            NULL 
User 3      1            NULL 
User 2      NULL         1
User 3      NULL         NULL 
User 2      NULL         NULL

I’d like to show a list of all the users with counts of Accepted/Rejected columns like so:

Username    Accepted    Rejected 
User 1      2           1
User 2      1           2
User 3      2           NULL

What is the best way to do it?

Answer 1

If Accepted and Rejected can contain 1, 0 and null only use sum because sum will return null if all values supplied are null:

select UserName, 
       sum(Accepted) Accepted,
       sum(Rejected) Rejected
  from ATable
 group by UserName

Count will return zero in Rejected column of user3.