vb-sql programming

i have an SQL table and want to have a Trigger for a running balance (Balance) as
Currency:       Debit:  Credit: Balance:
ZAR             10                              10
ZAR                             5               5

i have tried though not a trigger but not giving me what i want
CREATE TABLE Transactions(
   Transaction_Number NUMERIC,
   Transaction_Time TIMESTAMP,
   Account_Number INTEGER,
   Currency CHAR(8),
   Credit MONEY,
   Debit MONEY,
   PRIMARY KEY (Transaction_Number)
)
as
SELECT
   A.Transaction_Number,
   A.Transaction_Time,
   A.currency,
   A.debit,
   A.credit,
   SUM(B.Debit) - SUM(B.Credit) Balance
FROM Transactions A
JOIN Transactions B
   ON B.Account_Number = A.Account_Number
   AND B.Currency = A.Currency
   AND B.Transaction_Time <= A.Transaction_Time

GROUP BY
   A.Transaction_Number,
   A.Transaction_Time,
   A.currency,
   A.debit,
   A.credit,

ORDER BY
   A.Transaction_Time,
   A.Transaction_Number


gari55zwAsked:
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bhagyeshtCommented:
do you want the balance only? ie the final entry of each account? Please elorate the question
0
gari55zwAuthor Commented:
yes, i want the final balance after a transaction. the previous transacted balance affected by transaction type as follows,

Currency:       Debit:  Credit: Balance:
ZAR             10                              10
ZAR                             5                5
ZAR              3                               8

how do i get the balance
0
gari55zwAuthor Commented:
yes, i want the final balance after a transaction. the previous transacted balance affected by transaction type as follows,

Currency:       Debit:  Credit: Balance:
ZAR             10                              10
ZAR                             5                5
ZAR              3                               8

how do i get the balance
0
bhagyeshtCommented:
Currency:       Debit:  Credit: Balance:
is ur input table or output format
0
deepakshiCommented:
Write the code of trigger as

CREATE TABLE Transactions(
   Transaction_Number NUMERIC,
   Transaction_Time TIMESTAMP,
   Account_Number INTEGER,
   Currency CHAR(8),
   Credit MONEY,
   Debit MONEY,
   PRIMARY KEY (Transaction_Number)
)
as
SELECT
   A.Transaction_Number,
   A.Transaction_Time,
   A.currency,
   A.debit,
   A.credit,
   SUM(B.Debit) - SUM(B.Credit)
FROM Transactions A
JOIN Transactions B
   ON B.Account_Number = A.Account_Number
   AND B.Currency = A.Currency

GROUP BY
   A.Transaction_Number,
   A.Transaction_Time,
   A.currency,
   A.debit,
   A.credit,

ORDER BY
   A.Transaction_Time,
   A.Transaction_Number



and run this trigger after u have saved the new transaction in the table.
0

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