Multiple Join Multipliers - sql

Question

I have 3 tables: Insurance Policies, Claims and Receivables
I need a query that will return one row per policy period per policy. The query needs to include the policy start and end date, total claims for each period, total paid and O/S for each period, and total amount received for each period.
I've managed to do everything but the recievables. When this is introduced to the query, everything is multiplied by the number of rows in that table.
Here is my data
Policies
PolNo Version TransType InceptionDate RenewalDate
0021 0 New 01/01/2008 01/01/2009
0021 1 MTA 01/01/2008 01/01/2009
0021 2 MTA 01/01/2008 01/01/2009
0021 3 Renewal 01/01/2009 01/01/2010
Claims
PolNo ClaimNo ClaimDate Paid Outstanding
0021 0001 01/05/2008 300.00 -100.00
0021 0002 01/06/2008 500.00 200.00
0021 0003 01/07/2008 200.00 300.00
0021 0004 01/08/2008 800.00 0.00
0021 0005 01/02/2009 0.00 0.00
0021 0006 01/10/2009 0.00 1000.00
Receivables
PolNo Version RecvdDate Amount
0021 0 02/01/2008 150.00
0021 0 01/02/2008 150.00
0021 0 01/03/2008 150.00
0021 0 01/04/2008 150.00
0021 0 01/05/2008 150.00
0021 0 01/06/2008 150.00
0021 0 01/07/2008 150.00
0021 0 01/08/2008 150.00
0021 2 01/09/2008 150.00
0021 2 01/10/2008 150.00
0021 3 02/01/2009 500.00
0021 3 01/02/2009 500.00
Here is my working query
select distinct(a.InceptionDate) as InceptionDate, a.RenewalDate as RenewalDate,
count(b.ClaimNo) as ClaimCount, sum(b.Paid) as TotPaid, sum(b.Outstanding) as TotalO/S
from Policies a, Claims b
where a.PolNo='0021'
and a.PolNo=b.PolNo
and b.ClaimDate between a.InceptionDate and a.RenewalDate
and a.TransType in ('New','Renewal')
group by a.InceptionDate, a.RenewalDate
Result:
InceptionDate RenewalDate ClaimCount TotPaid TotalO/S
01/01/2008 01/01/2009 4 1800.00 400.00
01/01/2009 01/01/2010 2 0 1000.00
I had to add TransType to the query as I was getting a multiplier for claims data, but this query works.
Now when I add the third table, I get a multiplier. Everything from Claims is multiplied by the number or rows in Receivables for the period, and AmountRecvd is multiplied by the number of rows in Claims for the period.
Here is the query:
select distinct(a.InceptionDate) as InceptionDate, a.RenewalDate as RenewalDate,
count(b.ClaimNo) as ClaimCount, sum(b.Paid) as TotPaid, sum(b.Outstanding) asTotalO/S,
sum(c.Amount) as RecvdAmount
from Policies a, Claims b, Receivables c
where a.PolNo='0021'
and a.PolNo=b.PolNo
and a.PolNo=c.PolNo
and b.ClaimDate between a.InceptionDate and a.RenewalDate
and c.RecvdDate between a.InceptionDate and a.RenewalDate
and a.TransType in ('New','Renewal')
group by a.InceptionDate, a.RenewalDate
Result
InceptionDate RenewalDate ClaimCount TotPaid TotalO/S AmountRecvd
01/01/2008 01/01/2009 40 18000 4000 6000.00
01/01/2009 01/01/2010 20 0 10000 2000.00
I cant see that it is possible to join Receivables with Claims. I tried joining them on PolNo but had the same result.
Can anyone see a solution?
Cheers
Updated This query doesn't muliply ClaimsCount, but AmountRevd still multiplying by Claims (TotPaid removed for simplicity):
SELECT
p.InceptionDate,
p.RenewalDate,
sum(c1.ClaimCount) AS ClaimsCount,
sum(r1.TotRecvd) AS AmountRecvd
FROM Policies p
LEFT JOIN (SELECT
p1.InceptionDate,
p1.RenewalDate,
c.Polno,
c.ClaimDate,
COUNT(c.SubCount) AS ClaimCount
FROM Policies p1
INNER JOIN (SELECT
PolNo,
ClaimDate,
Count(*) as SubCount
FROM Claims
GROUP BY PolNo, ClaimDate) c
ON p1.PolNo=c.PolNo
WHERE c.ClaimDate BETWEEN p1.InceptionDate AND p1.RenewalDate
AND p1.TransType IN ('New','Renewal')
GROUP BY p1.InceptionDate, p1.RenewalDate, c.Polno, c.ClaimDate) c1
ON p.PolNo=c1.PolNo
LEFT JOIN (SELECT
p2.InceptionDate,
p2.RenewalDate,
r.Polno,
SUM(r.SubTot) AS TotalRecvd
FROM Policies p2
INNER JOIN (SELECT
PolNo,
RecvdDate,
SUM(Amount) as SubTot
FROM Receivables
GROUP BY Polno,RecvdDate) r
ON p2.PolNo=r.PolNo
WHERE r.RecvdDate BETWEEN p2.InceptionDate AND p2.RenewalDate
AND p2.TransType IN ('New','Renewal')
GROUPBY p2.InceptionDate, p2.RenewalDate, r.Polno) r1
ON p.PolNo=r1.PolNo
WHERE p.PolNo = '0021'
AND p.TransType IN ('New','Renewal')
AND p.PolNo = c1.PolNo
AND p.PolNo = r1.PolNo
AND p.InceptionDate = c1.InceptionDate
AND p.RenewalDate = c1.RenewalDate
AND p.InceptionDate = r1.InceptionDate
AND p.RenewalDate = r1.RenewalDate
GROUP BY p.InceptionDate, p.RenewalDate

Answer 1

-- Query for the periods:
WITH Periods AS (
SELECT DISTINCT
PolNo, InceptionDate, RenewalDate
FROM Policies
WHERE TransType in ('New','Renewal')
),
-- Query for the claims
PeriodClaims AS (
SELECT
p.PolNo, p.InceptionDate, p.RenewalDate,
COUNT(*) AS CountClaims,
SUM(c.Paid) AS PaidClaims,
SUM(c.Outstanding) AS OutstandingClaims
FROM Periods p
INNER JOIN Claims c ON c.PolNo = p.PolNo
WHERE c.ClaimDate BETWEEN p.InceptionDate AND p.RenewalDate
GROUP BY p.PolNo, p.InceptionDate, p.RenewalDate
),
-- Query for the receivables
PeriodRecieved AS (
SELECT
p.PolNo, p.InceptionDate, p.RenewalDate,
COUNT(*) AS CountReceived,
SUM(r.Amount) AS AmountReceived
FROM Periods p
INNER JOIN Receivables r ON r.PolNo = p.PolNo
WHERE r.RecvdDate BETWEEN p.InceptionDate AND p.RenewalDate
GROUP BY p.PolNo, p.InceptionDate, p.RenewalDate
)
-- All together now
SELECT
p.PolNo, p.InceptionDate, p.RenewalDate,
c.CountClaims, c.PaidClaims, c.OutstandingClaims,
r.CountReceived, r.AmountReceived
FROM Periods p
LEFT JOIN PeriodClaims c
ON c.PolNo = p.PolNo
AND c.InceptionDate = p.InceptionDate
AND c.RenewalDate = p.RenewalDate
LEFT JOIN PeriodRecieved r
ON r.PolNo = p.PolNo
AND r.InceptionDate = p.InceptionDate
AND r.RenewalDate = p.RenewalDate
Or, without CTE:
SELECT
p.PolNo, p.InceptionDate, p.RenewalDate,
c.CountClaims, c.PaidClaims, c.OutstandingClaims,
r.CountReceived, r.AmountReceived
FROM (
-- Query for the periods:
SELECT DISTINCT
PolNo, InceptionDate, RenewalDate
FROM Policies
WHERE TransType in ('New','Renewal')
) p
LEFT JOIN (
-- Query for the claims
SELECT
p.PolNo, p.InceptionDate, p.RenewalDate,
COUNT(*) AS CountClaims,
SUM(c.Paid) AS PaidClaims,
SUM(c.Outstanding) AS OutstandingClaims
FROM (
-- Query for the periods:
SELECT DISTINCT
PolNo, InceptionDate, RenewalDate
FROM Policies
WHERE TransType in ('New','Renewal')
) p
INNER JOIN Claims c ON c.PolNo = p.PolNo
WHERE c.ClaimDate BETWEEN p.InceptionDate AND p.RenewalDate
GROUP BY p.PolNo, p.InceptionDate, p.RenewalDate
) c
ON c.PolNo = p.PolNo
AND c.InceptionDate = p.InceptionDate
AND c.RenewalDate = p.RenewalDate
LEFT JOIN (
-- Query for the receivables
SELECT
p.PolNo, p.InceptionDate, p.RenewalDate,
COUNT(*) AS CountReceived,
SUM(r.Amount) AS AmountReceived
FROM (
-- Query for the periods:
SELECT DISTINCT
PolNo, InceptionDate, RenewalDate
FROM Policies
WHERE TransType in ('New','Renewal')
) p
INNER JOIN Receivables r ON r.PolNo = p.PolNo
WHERE r.RecvdDate BETWEEN p.InceptionDate AND p.RenewalDate
GROUP BY p.PolNo, p.InceptionDate, p.RenewalDate
) r
ON r.PolNo = p.PolNo
AND r.InceptionDate = p.InceptionDate
AND r.RenewalDate = p.RenewalDate
Output (transposed):
PolNo 21 21
InceptionDate 2008-01-01 2009-01-01
RenewalDate 2009-01-01 2010-01-01
CountClaims 4 2
PaidClaims 1800.00 0.00
OutstandingClaims 400.00 1000.00
CountReceived 10 2
AmountReceived 1500.00 1000.00