Create Trial Balance via Sql in MySql - mysql

Question

I am new to Sql, and need some guidance to create a Trial Balance via Sql query in MySql.
Consider the following scenario:
Two Tables:
Accounts
Transactions
Accounts Table fields details:
AccNo (PK)(varchar) (5)
AccName (varchar)(50)
AccOpBal (double)
Transactions Table fields details:
TransID (int) (Auto Increment) (PK)
AccNo (varchar) (5)
TransDt (DateTime)
TransDebit (Double)
TransCredit (Double)
Now I need a SQL query based on transDt date range(for e.g 01st Jan-14 to 31sth Jan-2014) which will return:
AccNo
AccOpBal
TransDebit (Sum of monthly transaction i.e Jan-2014)
TransCredit (Sum of monthly transaction i.e Jan-2014)
TransDebit (Sum of Yearly transaction i.e from 01st July-2013 to 31st Jan 2014 or YTD)
TransCredit (Sum of Yearly transaction i.e from 01st July-2013 to 31st Jan 2014 or YTD)
It is not necessary that every AccNo has opening balance (AccOpBal), likewise, it is also not necessary that every AccNo has transactions (TransDebit or TransCredit). But if an AccNo has any, it should be in query.
UPDATE Picture of sample trial added

Answer 1

You could achieve that result with a select over a union of two queries, one for the month to date and one for the year to date figures.
select accno, accopbal, sum(mtd_d), sum(mtd_c), sum(ytd_d),sum(ytd_c)
from
( select ao.accno
, ao.accOpBal
, 0 as mtd_d
, 0 as mtd_c
, 0 as ytd_d
, 0 as ytd_c
from accounts ao
left outer join transactions tn on tn.accno = ao.accno
where tn.accno is null
union
select tm.accno
, a.accOpBal
, sum(tm.transdebit) as mtd_d
, sum(tm.transcredit) as mtd_c
, 0 as ytd_d
, 0 as ytd_c
from accounts a
right outer join transactions tm on tm.accno = a.accno
where tm.transdt between '2014-01-01' and '2014-01-31'
group by a.accno, a.accopbal
union
select ty.accno
, a.accOpBal
, 0
, 0
, sum(ty.transdebit)
, sum(ty.transcredit)
from accounts a
right outer join transactions ty on ty.accno = a.accno
and ty.transdt between '2013-07-01' and '2014-01-31'
group by a.accno, a.accopbal
) alltxn
group by accno, accopbal
Here is a sqlfiddle with a small test set
and here is the testset:
-- january
insert into transactions values (1, 'alfki', '2014-01-01', 1,3);
insert into transactions values (1, 'alfki', '2014-01-02', 1,3);
insert into transactions values (1, 'alfki', '2014-01-03', 1,3);
-- last year
insert into transactions values (1, 'alfki', '2013-09-01', 5,2);
-- txn without acc
insert into transactions values (1, 'noexi', '2014-01-03', 4,2);
-- acc with txn
INSERT INTO Accounts values ( 'alfki', 'alfred', 4);
-- acc without txn
INSERT INTO Accounts values ( 'lefto', 'lefto', 6);
with the following query result:
ACCNO | ACCOPBAL |SUM(MTD_D)|SUM(MTD_C)|SUM(YTD_D)|SUM(YTD_C)
------+----------+----------+----------+----------+-----------
alfki | 4 | 3 | 9 | 8 | 11
lefto | 6 | 0 | 0 | 0 | 0
noexi | (null) | 4 | 2 | 4 | 2