SQL Query returning multiple Duplicate Results - sql

Question

scenario : I have Three Tables(Prisoners,AddPaymentTransaction,WithdrawPaymentTransation)
Date in Tables : i have 1 row of prisoner with PrisonerID=5 and two rows in both other table,
i have wrote query to return there data if any prisoner have add some payment in there account or with draw any payment from there payment on same day or on different dates etc.
here is my query :
select at.PrisonerID ,at.Amount as AAmount,at.Date as ADate,wt.Amount as WAmount,wt.Date as WDate
from Prisoners p, AddPaymentTransaction at,WithdrawPaymentTransation wt
where p.PrisonerID=at.PrisonerID and p.PrisonerID=wt.PrisonerID and at.PrisonerID=wt.PrisonerID and at.PrisonerID=5
but it gives me 4 rows, 9 rows when i have 3 rows of data in each Table etc.
i want rows of data with out duplicate. any suggestions or help will be highly appreciated.

Answer 1

It looks like at.PrisonerID = wt.PrisonerID in your query might be what is causing all of the duplicates. I am guessing AddPaymentTransaction and WithdrawPaymentTransation should not be linked together. So, how about the following:
SELECT at.PrisonerID, at.Amount as AAmount, at.Date as ADate,
wt.Amount as WAmount, wt.Date as WDate
FROM Prisoners p
INNER JOIN AddPaymentTransaction at p.PrisonerID = at.PrisonerID
INNER JOIN WithdrawPaymentTransation wt ON p.PrisonerID = wt.PrisonerID
WHERE at.PrisonerID = 5
but this probably isn't going to give you exactly what you are looking for either. So maybe something like the following:
SELECT * FROM
(
SELECT p.PrisonerID, 'AddPayment' AS Type,
apt.Amount as TransAmount, apt.Date AS TransDate
FROM Prisoners p
INNER JOIN AddPaymentTransaction apt ON p.PrisonerID = apt.PrisonerID
WHERE apt.PrisonerID = 5
UNION
SELECT p.PrisonerID, 'WithdrawPayment' AS Type,
wt.Amount as TransAmount, wt.Date as TransDate
FROM Prisoners p
INNER JOIN WithdrawPaymentTransation wt ON p.PrisonerID = wt.PrisonerID
WHERE wt.PrisonerID = 5
) AS mq
ORDER BY mq.TransDate DESC