On Thu, Dec 11, 2008 at 4:52 PM, Rahat Bashir <rahat.bashir@xxxxxxxxx>wrote: > Hi Experts, > > EID Mubarak to all. > > I need your help on writing a MySQL query. > > Scenario: > > CREATE TABLE transaction > ( > `id` int NOT NULL ATUTO INCREMENT, > `date` datetime NOT NULL, > `withdrawn` double (12,2) NULL, > `deposit` double (12,2) NULL > ); > > SELECT * FROM transaction; SELECT *, deposit-withdrawn AS balance FROM transaction Although i would suggest a transaction table to only have positive and negative balances. Then you can do all sorts of things with it like get the sum of all transactions a lot easier etc. e.g. SELECT SUM(balance) AS user_balance FROM transaction WHERE user_id=1 if you have a user id e.g. Are you working for a bank? :-) > > > id date > withdrawn deposit > ----- ----------------------------- > --------------- -------------- > 1 2008-12-01 00:00:00 > NULL 10000.00 > 2 2008-12-02 00:00:00 4000.00 > NULL > 3 2008-12-04 00:00:00 2000.00 > NULL > 4 2008-12-05 00:00:00 > NULL 4500.00 > 5 2008-12-06 00:00:00 500.00 > 1500.00 > > The above is all I have. I want to make query which should output an extra > calculated column named "balance", something like following: > > Expected output from query: > id date > withdrawn deposit balance > ----- ----------------------------- > --------------- -------------- ------------- > 1 2008-12-01 00:00:00 > NULL 10000.00 10000.00 > 2 2008-12-02 00:00:00 4000.00 > NULL 6000.00 > 3 2008-12-04 00:00:00 2000.00 > NULL 4000.00 > 4 2008-12-05 00:00:00 > NULL 4500.00 8500.00 > 5 2008-12-06 00:00:00 500.00 > 1500.00 9500.00 > > Thanks in advance > > > -- > Rahat Bashir > Dhaka, Bangladesh >
