Question

I have a SQL problem. my query looks like:

Select 
    s.idseminar, count(p.seminar)
From 
    Seminar as s 
LEFT OUTER JOIN 
    Predbiljezba AS p ON p.seminar = s.idSeminar 
WHERE 
    p.obradjena = 1
Group by 
    s.idSeminar


idseminar: 1, 2
count....: 2, 2

It should display number of accepted applications (predbiljezba with obradjena = 1 <== accepted status) for courses (seminar). It does almost what I need.

What I want is for it to display all the courses even if the number of accepted subscriptions is 0. If I omit the where clause:

Select 
    s.idseminar, count(p.seminar)
From 
    Seminar as s 
LEFT OUTER JOIN 
    Predbiljezba AS p ON p.seminar = s.idSeminar
Group by 
    s.idSeminar


idSeminar: 1,2,3,4       
count....: 2,2,1,0

it displays all the courses even if it it has 0 applications, but in these applications there are some that were not processed or were rejected and I do not want them to pop up in my query. I’ve found this link

Displaying rows in SQL Server where COUNT = 0

but the solution there doesn’t seem to work. I’m using SQL Server 2012.

Answer 1

You can use subselect in the main select clause

Select s.idseminar, 
   (select count(p.seminar) 
   from Predbiljezba p
   where p.seminar = s.idSeminar and p.obradjena = 1) as seminarCount
from Seminar s