Same values being returned for multiple rows in sql but not all columns - sql

Question

i'm currently running the following query (see below.)
However when i do the same values is returned for multiple rows in totalusers, activeusers and suspendedusers.
However when it comes to total login the values are unique.
Is their a reason why this could be happening and is their a way to solve the problem. If it helps im using the tool sql workben with postgre sql driver.
Cheers
SELECT
company.companyStatus,
company.CompanyId,
company.companyName,
select
count(distinct UserID)
From Users
inner join company
on Users.CompanyID = Company.CompanyId
where Users.Companyid = company.Companyid
as TotalUsers,
select sum(case when userstatusid =2 then 1 else 0 end)
from users
inner join company
on users.companyid = company.companyid
where users.companyid = company.companyid)
as ActiveUsers,
select sum(case when userstatusid = 3 then 1 else 0 end)
from users
inner join company
on users.companyid = company.companyid
where users.companyid = company.companyid)
as SuspendedUsers,
(Select COUNT (distinct usersessionid)
From UserSession
inner join users
on usersession.UserID=users.UserID
where usersession.UserID=users.UserID
and users.companyid= company.CompanyID)
as TotalLogin,
from Company

Answer 1

Its because your TotalUsers, ActiveUsers and SuspendedUsers queries are all using their own (unrestricted) copy of the Company table, whereas your TotalLogin is using the main instance from which you're selecting. This means that the TotalLogin numbers you're seeing are for that particular company, but the other fields are across ALL companies.
Presumably you wanted something more like:
SELECT
company.companyStatus,
company.CompanyId,
company.companyName,
count(distinct u.UserID) TotalUsers,
sum(case when u.userstatusid =2 then 1 else 0 end) ActiveUsers,
sum(case when u.userstatusid = 3 then 1 else 0 end) SuspendedUsers,
count(distinct u.usersessionid) TotalLogin
from Company
inner join Users on Users.CompanyID = Company.CompanyId

Answer 2

The reason is because you have company in the subqueries for those calculations.
I much prefer having table references in the from clause where possible, and you can write this query moving everything to the from clause:
SELECT c.companyStatus, c.CompanyId, c.companyName,
uc.Totalusers, uc.Activeusers, uc.Suspendedusers, ucs.TotalLogin
from Company c left outer join
(select u.companyid,
COUNT(distinct userid) as Totalusers,
SUM(case when userstatusid = 2 then 1 else 0 end) as ActiveUsers,
sum(case when userstatusid = 3 then 1 else 0 end) as Suspendedusers
from users u
group by u.companyid
) uc
uc.companyid = c.companyId left outer join
(select u.companyid, COUNT(distinct usersessionid) as TotalLogin
from UserSession us inner join
users u
on us.UserID = u.UserID
) ucs
on ucs.companyid = c.companyid;
This should also speed up the query because it doesn't have to do the same work multiple times.