Opening balance and closing balance for a non-working date - mysql

Question

Need a help on how to get opening balances and closing balances of a non-working date in my transaction table in my database.
transaction table
+------------------+----------+-----------+
| id | trans_date | debit | credit |
+----+-------------+----------+-----------+
| 1 | 2016-05-09 | 200.00 | 0.00 |
| 2 | 2016-05-11 | 0.00 | 50.00 |
+---------------+-------------+-----------+
Want a result like below. You will realize there were no transaction on "2016-05-10" but the result shows both opening balance and closing balance. Thanks
+-------------+--------------+-----------+-----------+------------+
| trans_date | open_bal | debit | credit |closing_bal |
+-------------+--------------+-----------+-----------+------------+
| 2016-05-09 | 0.00 | 200.00 | 0.00 | 200.00 |
| 2016-05-10 | 200.00 | 0.00 | 0.00 | 200.00 |
| 2016-05-11 | 200.00 | 0.00 | 50.00 | 150.00 |
+-------------+-------------+--------------+------------+---------+
I tried this but "2016-05-10" does not show in the result.
SELECT trans_date,open_balance
FROM(SELECT s.gen_id, s.trans_id, s.trans_date,
s.narations, s.account_code,
s.op_balance as open_balance,
s.debit, s.credit, s.closing_balance
from ( select t.gen_id, t.trans_id,
t.narations, t.account_code,
t.trans_date, t.credit, t.debit,
#tot_debit := if(#prev_client = t.account_code, #tot_debit + t.debit,t.debit) as tot_cred,
#tot_credit := if(#prev_client = t.account_code,#tot_credit + t.credit,t.credit) as tot_deb,
#cur_bal := if(#prev_client = t.account_code, #tot_debit - #tot_credit,t.debit-t.credit) as closing_balance,
(#cur_bal + t.credit) - t.debit as op_balance, #prev_client := t.account_code
from (select * from journal WHERE account_code = 41003
GROUP BY trans_date order by trans_date,account_code,trans_id)t, (select #prev_client:=0,#cur_bal:=0,#tot_debit:=0,#tot_credit:= 0,#open_balance:=0)r )s) g where trans_date <= '2016-05-11'

Answer 1

You can use this to select list of dates in MySQL.
SELECT DATE_ADD(CURDATE() , INTERVAL -(a.n + 10 * b.n + 100 * c.n) DAY) AS `date`
FROM (SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 0) AS a
CROSS JOIN (SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 0) AS b
CROSS JOIN (SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 0) AS c
If you want to include in result dates not presented at table transactions, it can be done with LEFT JOIN
SELECT * FROM
(SELECT DATE_ADD(CURDATE() , INTERVAL -(a.n + 10 * b.n + 100 * c.n) DAY) AS `date`
FROM (SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 0) AS a
CROSS JOIN (SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 0) AS b
CROSS JOIN (SELECT 1 AS n UNION SELECT 2 UNION SELECT 3 UNION SELECT 4 UNION SELECT 5 UNION SELECT 6 UNION SELECT 7 UNION SELECT 8 UNION SELECT 9 UNION SELECT 0) AS c
) AS dates
LEFT JOIN transactions ON trans_date = dates.date
Note, that this will select dates from current for 999 past days. If you want more days ago, another CROSS JOIN can be added and 9 999 days will be returned.