Statement of account from transactions SQL - sql

Question

I have a list of transactions in a table for a user which records, the UserID, DateTime, TransactionType and Value. TransactionID is the Primary Key auto increment 1. The TransactionType defines a Deposit (1) or Withdrawal (2) so all values are positive in the table. I am trying to create a statement of account with a running total.
TransactionID UserID DateTime TransactionTypeID Value
1 3112 01-04-2016 12:00 1 5.00
3 3112 01-04-2016 13:00 2 2.00
5 3112 01-04-2016 13:25 2 1.00
8 3112 02-04-2016 12:00 1 10.00
9 3112 02-04-2016 12:35 2 4.00
Basically I want to create a running statement of account query with a Total value to create:
DateTime TransactionTypeID Deposit Withdrawal Balance
01-04-2016 12:00 1 5.00 5.00
01-04-2016 13:00 2 2.00 3.00
01-04-2016 13:25 2 1.00 2.00
02-04-2016 12:00 1 10.00 12.00
02-04-2016 12:35 2 4.00 8.00
I have tried using OUTER APPLY to select the previous transaction but with no prevail in a single query. Any assistance would be appreciated
SELECT
[UserID], [DateTime],
T.[Value] *
(CASE
WHEN [TransactionTypeID] IN (1, -- deposit
2 -- withdrawal
)
THEN -1
ELSE 1
END),
T2.Value AS PrevValue
FROM
[Transaction] T
OUTER APPLY
(SELECT TOP 1 T2.[Value]
FROM [Transaction] T2
WHERE UserID = 3112
AND T2.[TransactionID] > T.TransactionID
ORDER BY T2.TransactionID) AS T2
WHERE
T.[UserID] = 3112
ORDER BY
T.[TransactionID] DESC

Answer 1

the query you're asking for should look something like this..
SQL 2005
SELECT [DateTime],
[TransactionID],
[Deposit] = CASE WHEN TransactionTypeID = 1 THEN [Value] END,
[Withdrawal] = CASE WHEN TransactionTypeID = 2 THEN -[Value] END,
[Balance] = CASE TransactionTypeID WHEN 1 THEN [Value]
WHEN 2 THEN -[Value] END + ISNULL([PrevValue], 0)
FROM [Transaction] t1
OUTER APPLY (SELECT SUM(CASE TransactionTypeID WHEN 1 THEN [Value]
WHEN 2 THEN -[Value] END) AS [PrevValue]
FROM [Transaction] t2
WHERE t1.UserID = t2.UserID AND t2.[DateTime] < t1.[DateTime]) ca
WHERE UserID = 3112
SQL 2008+
SELECT [DateTime],
[TransactionID],
[Deposit] = CASE WHEN TransactionTypeID = 1 THEN [Value] END,
[Withdrawal] = CASE WHEN TransactionTypeID = 2 THEN -[Value] END,
[Balance] = SUM(CASE TransactionTypeID WHEN 1 THEN [Value]
WHEN 2 THEN -[Value] END)
OVER (ORDER BY [DateTime])
FROM [Transaction]
WHERE UserID = 3112

Answer 2

I Have found a SQL Server 2012 solution. If you are running an older version please check alternatives.
It uses SUM OVER..
select [TransactionID],
[DateTime],
( CASE WHEN [TransactionTypeID] IN (
1, -- deposits
2 -- withdrawals
)
THEN -[Value]
ELSE [Value]
END
),
sum(( CASE WHEN [TransactionTypeID] IN (
1, -- deposits
2 -- withdrawals
)
THEN -[Value]
ELSE [Value]
END
)) over(order by [DateTime] rows unbounded preceding) as runningtotal
from [Transaction]
WHERE UserID = 3112