Using two Count() functions without changing the results - sql

Question

SELECT CARRIER.CARRIERID, PLAN.PLANID, PLNDESCRIPTION,
COUNT(MEMBER.PLANID) AS MBRCNT
FROM CARRIER
LEFT OUTER JOIN PLAN
ON CARRIER.CARRIERID = PLAN.CARRIERID
LEFT OUTER JOIN MEMBER
ON PLAN.PLANID = MEMBER.PLANID
GROUP BY CARRIER.CARRIERID, PLAN.PLANID, PLNDESCRIPTION
ORDER BY CARRIER.CARRIERID;
results in
CARR PLANID PLNDESCRIPTION MBRCNT
---- ---------- ----------------------------------- ----------
ANTH 4 Single SuperMed 6
ANTH 5 2-Party SuperMed 4
ANTH 6 Family SuperMed 7
BCBS 1 Single Basic Medical 9
BCBS 2 2-Party Basic Medical 15
BCBS 3 Family Basic Medical 11
DLT 7 Single Dental Only 6
DLT 8 Family Dental Only 0
MM 10 Single SuperMed with Dental 5
MM 11 2-Party SuperMed with Dental 0
MM 12 Family SuperMed with Dental 2
NWD 9 Life Only 2
PHC 0
and
SELECT CARRIER.CARRIERID, COUNT(PLAN.CARRIERID)
FROM CARRIER
LEFT OUTER JOIN PLAN
ON CARRIER.CARRIERID = PLAN.CARRIERID
LEFT OUTER JOIN MEMBER
ON PLAN.PLANID = MEMBER.PLANID
GROUP BY CARRIER.CARRIERID
ORDER BY CARRIER.CARRIERID;
result in
CARR COUNT(PLAN.CARRIERID)
---- ---------------------------------------
ANTH 17
BCBS 35
DLT 7
MM 8
NWD 2
PHC 0
How can I combine these to get all of the rows next to each other?

Answer 1

I think you just want analytic functions:
SELECT c.CARRIERID, p.PLANID, p.PLNDESCRIPTION,
COUNT(m.PLANID) AS MBRCNT,
SUM(COUNT(m.PLANID)) OVER (PARTITION BY c.CARRIERID) as CNT_2
FROM CARRIER c LEFT JOIN
PLAN p
ON c.CARRIERID = p.CARRIERID LEFT JOIN
MEMBER m
ON p.PLANID = m.PLANID
GROUP BY c.CARRIERID, p.PLANID, p.PLNDESCRIPTION
ORDER BY c.CARRIERID;

Answer 2

One option is to full outer join them together
with firstCount as (
SELECT CARRIER.CARRIERID, PLAN.PLANID, PLNDESCRIPTION,
COUNT(MEMBER.PLANID) AS MBRCNT
FROM CARRIER
LEFT OUTER JOIN PLAN
ON CARRIER.CARRIERID = PLAN.CARRIERID
LEFT OUTER JOIN MEMBER
ON PLAN.PLANID = MEMBER.PLANID
GROUP BY CARRIER.CARRIERID, PLAN.PLANID, PLNDESCRIPTION
ORDER BY CARRIER.CARRIERID
)
secondCount as (
SELECT CARRIER.CARRIERID, COUNT(PLAN.CARRIERID) as count
FROM CARRIER
LEFT OUTER JOIN PLAN
ON CARRIER.CARRIERID = PLAN.CARRIERID
LEFT OUTER JOIN MEMBER
ON PLAN.PLANID = MEMBER.PLANID
GROUP BY CARRIER.CARRIERID
ORDER BY CARRIER.CARRIERID
)
select coalesce(firstCount.carrierId, secondCount.carrierId) as carrierId,
firstCount.PLANID,
firstCount.PLNDESCRIPTION,
firstCount.MBRCNT,
secondCount.Count
from firstCount
full outer join secondCount on firstCount.CarrierId = secondCount.CarrierId