Query to calculate total

How can I create one SQL that will give me a 'TOTAL' from:

The result of this:

SELECT   (  SUM  (UnitCost  * Qty)- (SUM ( PmtRecd))   ) AS BALANCE
FROM dbo.BillingLines WHERE CaseId = 20816  Group by  CaseId

Minus the result of this:

SELECT SUM (Amount) as total
FROM dbo.PaymntSchedule WHERE   Caseid = 20816
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AleksAsked:
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Pavel GushchinProgrammerCommented:
SELECT BALANCE-COALESCE((SELECT SUM(Amount) FROM dbo.PaymntSchedule WHERE Caseid = z.CaseId),0) as RESULT
from
(
SELECT CaseId, SUM(UnitCost * Qty)-SUM(PmtRecd) AS BALANCE 
FROM dbo.BillingLines WHERE CaseId = 20816  
Group by CaseId
) z

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Ryan ChongBusiness Systems Analyst , ex-Senior Application EngineerCommented:
or something like:

Select bal1.BALANCE - bal2.total Total from 
(
	SELECT   (  SUM  (UnitCost  * Qty)- (SUM ( PmtRecd))   ) AS BALANCE 
         FROM dbo.BillingLines WHERE CaseId = 20816  Group by  CaseId
) bal1, 
(
	SELECT SUM (Amount) as total 
        FROM dbo.PaymntSchedule WHERE   Caseid = 20816
) bal2

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slightwv (䄆 Netminder) Commented:
Possibly a join?
SELECT   (  SUM  (UnitCost  * Qty)- (SUM ( PmtRecd))   ) - SUM (Amount) AS Total
FROM dbo.BillingLines B join dbo.PaymntSchedule P on B.caseid=P.caseid
WHERE b.CaseId = 20816 

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Pavel GushchinProgrammerCommented:
If there are no any rows selected from PaymntSchedule, then answer from slightwv (䄆 Netminder) and from Ryan Chong will not work.
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slightwv (䄆 Netminder) Commented:
If there are no payments then make mine a LEFT JOIN?

SELECT   (  SUM  (UnitCost  * Qty)- (SUM ( PmtRecd))   ) - SUM (Amount) AS Total
FROM dbo.BillingLines B left join dbo.PaymntSchedule P on B.caseid=P.caseid
WHERE b.CaseId = 20816 

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I'm not seeing why Ryan's will not work?  The second query should return a 0 if there are no payments.
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Query Syntax

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