How to create a running balance column based on account number?
https://dba.stackexchange.com/questions/268214
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02-03-2021 - |
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I have a stored procedure that returns account statement for one or multiple accounts Here is the part I have issues with: returning a running balance in each record based on account number. My query doesn't reset the balance for each account, how do I do this??
SELECT
acc_account_transactions.account_no,
COALESCE(debit_balance) as debits
, COALESCE(credit_balance) as credits
, (@running_balance := @running_balance + (acc_account_transactions.debit_balance - acc_account_transactions.credit_balance)) as balance
FROM acc_account_transactions
JOIN (SELECT @running_balance := 0) r
ORDER BY account_no
When running this, I get something like this, but the balance doesn't reset on each account
account debit credit balance
13 |2578.19 | 0.00 | 2578.19
13 |1500.00 | 0.00 | 4078.19
13 |1500000.00 | 0.00 | 1504078.19
13 |1500.00 | 0.00 | 1505578.19
14 |1500000.00 | 0.00 | 3005578.19 <--- reset before this
14 |0.00 | 13500.00 | 2992078.19
14 |0.00 | 13500.00 | 2978578.19
14 |33458.43 | 0.00 | 3012036.62
15 |0.00 | 100000.00 | 2912036.62 <--- reset before this
15 |18506.34 | 0.00 | 2930542.96
16 |946.20 | 0.00 | 2931489.16 <--- reset before this
17 |90364.77 | 0.00 | 3021853.93 <--- reset before this
21 |0.00 | 0.00 | 3021853.93 <--- reset before this
22 |0.00 | 0.00 | 3021853.93 <--- reset before this
23 |0.00 | 0.00 | 3021853.93 <--- reset before this
23 |1105500.00 | 0.00 | 4127353.93
24 |1327.00 | 0.00 | 4128680.93 <--- reset before this
25 |0.00 | 0.00 | 4128680.93 <--- reset before this
Thanks
Solution
It seems you need in simple
SELECT *, SUM(debit_balance - credit_balance)
OVER (PARTITION BY account_no ORDER BY id) balance
FROM acc_account_transactions
OTHER TIPS
Your query was only missing the ability to reset @running_balance. You can only reset @running_balance when the row has a different account_no from the previous row.
With this in mind, I give you (drum roll please) ...
PROPOSED QUERY
SELECT account_no,debits,credits,balance FROM
(SELECT
account_no
,COALESCE(debit_balance) as debits
,COALESCE(credit_balance) as credits
,(@running_balance := IF(@curr_account_no < account_no, 0,@running_balance)) prev_runnng_bal
,(@curr_account_no := IF(@curr_account_no < account_no,account_no,@curr_account_no)) curr_account_no
,(@running_balance := @running_balance + (acc_account_transactions.debit_balance - acc_account_transactions.credit_balance)) as balance
FROM acc_account_transactions,(SELECT @running_balance := 0,@curr_account_no := 0) r
ORDER BY account_no) A;
SUBQUERY WITHIN PROPOSED QUERY
SELECT
account_no
,COALESCE(debit_balance) as debits
,COALESCE(credit_balance) as credits
,(@running_balance := IF(@curr_account_no < account_no, 0,@running_balance)) prev_runnng_bal
,(@curr_account_no := IF(@curr_account_no < account_no,account_no,@curr_account_no)) curr_account_no
,(@running_balance := @running_balance + (acc_account_transactions.debit_balance - acc_account_transactions.credit_balance)) as balance
FROM acc_account_transactions,
(SELECT @running_balance := 0,@curr_account_no := 0) r
ORDER BY account_no;
SAMPLE DATA
DROP DATABASE IF EXISTS abeersul;
CREATE DATABASE abeersul;
USE abeersul
CREATE TABLE acc_account_transactions
(
id INT NOT NULL AUTO_INCREMENT,
account_no INT NOT NULL,
debit_balance DOUBLE NOT NULL,
credit_balance DOUBLE NOT NULL,
PRIMARY KEY (id)
);
INSERT INTO acc_account_transactions
(account_no,debit_balance,credit_balance) VALUES
(13,2578.19 , 0.00 ),
(13,1500.00 , 0.00 ),
(13,1500000.00 , 0.00 ),
(13,1500.00 , 0.00 ),
(14,1500000.00 , 0.00 ),
(14,0.00 , 13500.00 ),
(14,0.00 , 13500.00 ),
(14,33458.43 , 0.00 ),
(15,0.00 , 100000.00),
(15,18506.34 , 0.00 ),
(16,946.20 , 0.00 ),
(17,90364.77 , 0.00 ),
(21,0.00 , 0.00 ),
(22,0.00 , 0.00 ),
(23,0.00 , 0.00 ),
(23,1105500.00 , 0.00 ),
(24,1327.00 , 0.00 ),
(25,0.00 , 0.00 );
SELECT * FROM acc_account_transactions;
SAMPLE DATA LOADED
mysql> DROP DATABASE IF EXISTS abeersul;
Query OK, 1 row affected (0.02 sec)
mysql> CREATE DATABASE abeersul;
Query OK, 1 row affected (0.00 sec)
mysql> USE abeersul
Database changed
mysql> CREATE TABLE acc_account_transactions
-> (
-> id INT NOT NULL AUTO_INCREMENT,
-> account_no INT NOT NULL,
-> debit_balance DOUBLE NOT NULL,
-> credit_balance DOUBLE NOT NULL,
-> PRIMARY KEY (id)
-> );
Query OK, 0 rows affected (0.01 sec)
mysql> INSERT INTO acc_account_transactions
-> (account_no,debit_balance,credit_balance) VALUES
-> (13,2578.19 , 0.00 ),
-> (13,1500.00 , 0.00 ),
-> (13,1500000.00 , 0.00 ),
-> (13,1500.00 , 0.00 ),
-> (14,1500000.00 , 0.00 ),
-> (14,0.00 , 13500.00 ),
-> (14,0.00 , 13500.00 ),
-> (14,33458.43 , 0.00 ),
-> (15,0.00 , 100000.00),
-> (15,18506.34 , 0.00 ),
-> (16,946.20 , 0.00 ),
-> (17,90364.77 , 0.00 ),
-> (21,0.00 , 0.00 ),
-> (22,0.00 , 0.00 ),
-> (23,0.00 , 0.00 ),
-> (23,1105500.00 , 0.00 ),
-> (24,1327.00 , 0.00 ),
-> (25,0.00 , 0.00 );
Query OK, 18 rows affected (0.00 sec)
Records: 18 Duplicates: 0 Warnings: 0
mysql> SELECT * FROM acc_account_transactions;
+----+------------+---------------+----------------+
| id | account_no | debit_balance | credit_balance |
+----+------------+---------------+----------------+
| 1 | 13 | 2578.19 | 0 |
| 2 | 13 | 1500 | 0 |
| 3 | 13 | 1500000 | 0 |
| 4 | 13 | 1500 | 0 |
| 5 | 14 | 1500000 | 0 |
| 6 | 14 | 0 | 13500 |
| 7 | 14 | 0 | 13500 |
| 8 | 14 | 33458.43 | 0 |
| 9 | 15 | 0 | 100000 |
| 10 | 15 | 18506.34 | 0 |
| 11 | 16 | 946.2 | 0 |
| 12 | 17 | 90364.77 | 0 |
| 13 | 21 | 0 | 0 |
| 14 | 22 | 0 | 0 |
| 15 | 23 | 0 | 0 |
| 16 | 23 | 1105500 | 0 |
| 17 | 24 | 1327 | 0 |
| 18 | 25 | 0 | 0 |
+----+------------+---------------+----------------+
18 rows in set (0.00 sec)
mysql>
SUBQUERY WITHIN PROPOSED QUERY EXECUTED
mysql> SELECT
-> account_no
-> ,COALESCE(debit_balance) as debits
-> ,COALESCE(credit_balance) as credits
-> ,(@running_balance := IF(@curr_account_no < account_no, 0,@running_balance)) prev_runnng_bal
-> ,(@curr_account_no := IF(@curr_account_no < account_no,account_no,@curr_account_no)) curr_account_no
-> ,(@running_balance := @running_balance + (acc_account_transactions.debit_balance - acc_account_transactions.credit_balance)) as balance
-> FROM acc_account_transactions,
-> (SELECT @running_balance := 0,@curr_account_no := 0) r
-> ORDER BY account_no;
+------------+----------+---------+-----------------+-----------------+------------+
| account_no | debits | credits | prev_runnng_bal | curr_account_no | balance |
+------------+----------+---------+-----------------+-----------------+------------+
| 13 | 1500 | 0 | 0 | 13 | 1500 |
| 13 | 1500000 | 0 | 1500 | 13 | 1501500 |
| 13 | 1500 | 0 | 1501500 | 13 | 1503000 |
| 13 | 2578.19 | 0 | 1503000 | 13 | 1505578.19 |
| 14 | 1500000 | 0 | 0 | 14 | 1500000 |
| 14 | 0 | 13500 | 1500000 | 14 | 1486500 |
| 14 | 0 | 13500 | 1486500 | 14 | 1473000 |
| 14 | 33458.43 | 0 | 1473000 | 14 | 1506458.43 |
| 15 | 18506.34 | 0 | 0 | 15 | 18506.34 |
| 15 | 0 | 100000 | 18506.34 | 15 | -81493.66 |
| 16 | 946.2 | 0 | 0 | 16 | 946.2 |
| 17 | 90364.77 | 0 | 0 | 17 | 90364.77 |
| 21 | 0 | 0 | 0 | 21 | 0 |
| 22 | 0 | 0 | 0 | 22 | 0 |
| 23 | 0 | 0 | 0 | 23 | 0 |
| 23 | 1105500 | 0 | 0 | 23 | 1105500 |
| 24 | 1327 | 0 | 0 | 24 | 1327 |
| 25 | 0 | 0 | 0 | 25 | 0 |
+------------+----------+---------+-----------------+-----------------+------------+
18 rows in set (0.00 sec)
mysql>
PROPOSED QUERY EXECUTED
mysql> SELECT account_no,debits,credits,balance FROM
-> (SELECT
-> account_no
-> ,COALESCE(debit_balance) as debits
-> ,COALESCE(credit_balance) as credits
-> ,(@running_balance := IF(@curr_account_no < account_no, 0,@running_balance)) prev_runnng_bal
-> ,(@curr_account_no := IF(@curr_account_no < account_no,account_no,@curr_account_no)) curr_account_no
-> ,(@running_balance := @running_balance + (acc_account_transactions.debit_balance - acc_account_transactions.credit_balance)) as balance
-> FROM acc_account_transactions,(SELECT @running_balance := 0,@curr_account_no := 0) r
-> ORDER BY account_no) A;
+------------+----------+---------+------------+
| account_no | debits | credits | balance |
+------------+----------+---------+------------+
| 13 | 1500 | 0 | 1500 |
| 13 | 1500000 | 0 | 1501500 |
| 13 | 1500 | 0 | 1503000 |
| 13 | 2578.19 | 0 | 1505578.19 |
| 14 | 1500000 | 0 | 1500000 |
| 14 | 0 | 13500 | 1486500 |
| 14 | 0 | 13500 | 1473000 |
| 14 | 33458.43 | 0 | 1506458.43 |
| 15 | 18506.34 | 0 | 18506.34 |
| 15 | 0 | 100000 | -81493.66 |
| 16 | 946.2 | 0 | 946.2 |
| 17 | 90364.77 | 0 | 90364.77 |
| 21 | 0 | 0 | 0 |
| 22 | 0 | 0 | 0 |
| 23 | 0 | 0 | 0 |
| 23 | 1105500 | 0 | 1105500 |
| 24 | 1327 | 0 | 1327 |
| 25 | 0 | 0 | 0 |
+------------+----------+---------+------------+
18 rows in set (0.01 sec)
mysql>
GIVE IT A TRY !!!
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