Union with Group By - sql

Question

Had a look at other questions, tried different things but still returning more than one row.
Problem with Union on 2 tables, with group by clause. There should only be one row returned, grouped by the serviceID.
SELECT
serviceID,
serviceName,
FullCount,
WaitingCount,
InProgressCount
from (
select
a.serviceID,
serviceName,
count(applicantID) FullCount,
ISNULL(SUM(CASE WHEN status = 0 THEN 1 ELSE 0 END),0) AS WaitingCount,
ISNULL(SUM(CASE WHEN status = 1 THEN 1 ELSE 0 END),0) AS InProgressCount
from Products s
left join Assigns a on a.serviceID = s.productID
WHERE s.clientID = #ClientID
group by serviceID, serviceName
UNION
select
s.serviceID,
p.serviceName,
count(s.ApplicantID) FullCount,
ISNULL(SUM(CASE WHEN s.status = 0 THEN 1 ELSE 0 END),0) AS WaitingCount,
ISNULL(SUM(CASE WHEN s.status = 1 THEN 1 ELSE 0 END),0) AS InProgressCount
from Legacies s
Left Join Products p on s.serviceID = p.productID
WHERE s.client = #CompanyName
group by serviceID, serviceName
) t
GROUP BY serviceID, serviceName
I'm always getting 2 rows returned, one from each of the tables. I need to group them both together so it only returns 1 row, based on the servicedID.
The data I'm trying to return is from the following tables..
Products Table
productID serviceName
-------------------------
1 Gold Service
2 Silver Service
3 Bronze Service
Assigns Table
ApplicantID serviceID status
-------------------------------------
1 1 0
2 1 0
3 1 1
4 2 0
5 1 1
Legacies Table
ApplicantID serviceID status
-------------------------------------
1 1 0
2 1 0
3 1 0
4 2 0
5 1 1
The result I'm trying to get is one row per serviceID, to show how many applicants are on this service in both the Legacies and Assigns table, something like:-
serviceID serviceName FullCount WaitingCount InProgressCount
----------------------------------------------------------------
1 Gold Service 8 5 3
2 Silver Service 2 2 0
3 Bronze Service 0 0 0
FullCount is a total number of applicants on each service, WaitingCount is the number of applicants on the service with a status of '0' and InProgressCount is the number on this service with a status of '1'

Answer 1

Based on additional information, I think you can just union all the Legacies and Assigns tables.
still untested
select serviceID, servicename, count(*) fullcount
,sum(case when status = 0 THEN 1 ELSE 0 END) AS WaitingCount
,SUM(CASE WHEN status = 1 THEN 1 ELSE 0 END) AS InProgressCount
from (
select ApplicantID, serviceID, status
from Assigns
WHERE clientID = #ClientID
union all
select ApplicantID, serviceID, status
from Legacies
WHERE clientID = #ClientID
) combined
left join Products P on P.productID = combined.serviceID
group by serviceID, servicename
below is before edit
It's hard to tell because you do not post enough information (no sample data, no table structures, no expected output). But I think you can probably combine it all into 1 query:
untested which should be obvious with the lack of information.
SELECT isnull(a.serviceID, L.serviceID) serviceID, p.serviceName
,count(*) FullCount, SUM(CASE WHEN isnull(a.status, L.status) = 0 THEN 1 ELSE 0 END) WaitingCount
,sum(CASE WHEN isnull(a.status, L.status) = 1 THEN 1 ELSE 0 END) InProgressCount
from Legacies L
full outer join Assigns a on a.serviceID = L.serviceID
right outer join Products P on P.productID = isnull(a.serviceID, L.serviceID)
where (P.clientID = #ClientID
or L.client = #CompanyName
)
group by isnull(a.serviceID, L.serviceID), p.serviceName