I need to get the difference of two SUM...WHERE
queries from the same table join:
SELECT SUM(Service_template.Service_fee)
FROM (Service_template LEFT JOIN Service ON Service_template.Service_Code = Service.Service_Code) LEFT JOIN Bill ON Service.Service_ID = Bill.Service_ID
WHERE Bill.Service_ID IS NOT NULL
and
SELECT SUM(Service_template.Service_fee)
FROM (Service_template LEFT JOIN Service ON Service_template.Service_Code = Service.Service_Code) LEFT JOIN Bill ON Service.Service_ID = Bill.Service_ID
I've tried using UNION
, but it returns two rows, not two columns I can make calculations on.
How do I go about doing it? I feel I am missing something trivial, so thanks in advance!
This should work:
Select
Sum(T1.Sum1),
Sum(T2.Sum2),
Sum(T1.Sum1) - Sum(T2.Sum2) As Diff1,
Sum(T2.Sum2) - Sum(T1.Sum1) As Diff2
From
(SELECT SUM(Service_template.Service_fee) As Sum1 FROM (Service_template LEFT JOIN Service ON Service_template.Service_Code = Service.Service_Code) LEFT JOIN Bill ON Service.Service_ID = Bill.Service_ID WHERE Bill.Service_ID IS NOT NULL) As T1,
(SELECT SUM(Service_template.Service_fee) As Sum2 FROM (Service_template LEFT JOIN Service ON Service_template.Service_Code = Service.Service_Code) LEFT JOIN Bill ON Service.Service_ID = Bill.Service_ID) As T2
If you want all three values, you can use conditional aggregation:
SELECT SUM(IIF(b.Service_ID IS NOT NULL, st.Service_fee, 0)) as total_1,
SUM(b.Service_Id) as total_2,
SUM(IIF(b.Service_ID IS NULL, st.Service_fee, 0)) as diff
FROM (Service_template as st LEFT JOIN
Service as s
ON st.Service_Code = s.Service_Code
) LEFT JOIN
Bill as b
ON s.Service_ID = b.Service_ID;
If you just want the SUM()
where Service_Id
is NULL
, then:
SELECT SUM(b.Service_Id) as diff
FROM (Service_template as st LEFT JOIN
Service as s
ON st.Service_Code = s.Service_Code
) LEFT JOIN
Bill as b
ON s.Service_ID = b.Service_ID
WHERE b.Service_ID IS NULL;
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