SQL query - credit , debit , balance - mysql

Question

DISCLAIMER : I Know this has been asked numerous times, but all I want is an alternative.
The table is as below :
create table
Account
(Name varchar(20),
TType varchar(5),
Amount int);
insert into Account Values
('abc' ,'c', 500),
('abc', 'c', 700),
('abc', 'd', 100),
('abc', 'd', 200),
('ab' ,'c', 300),
('ab', 'c', 700),
('ab', 'd', 200),
('ab', 'd', 200);
Expected result is simple:
Name Balance
------ -----------
ab 600
abc 900
The query that worked is :
select Name, sum(case TType when 'c' then Amount
when 'd' then Amount * -1 end) as balance
from Account a1
group by Name.
All I want is, is there any query sans the 'case' statement (like subquery or self join ) for the same result?

Answer 1

Sure. You can use a second query with a where clause and a union all:
select name
, sum(Amount) balance
from Account a1
where TType when 'c'
group
by Name
union
all
select name
, sum(Amount * -1) balance
from Account a1
where TType when 'd'
group
by Name
Or this, using a join with an inline view:
select name
, sum(Amount * o.mult) balance
from Account a1
join ( select 'c' cd
, 1 mult
from dual
union all
select 'd'
, -1
from dual
) o
on o.cd = a1.TType
group
by Name
To be honest, I would suggest to use case...

Answer 2

Use the ASCII code of the char and try to go from there. It is 100 for 'd' and 99 for 'c'. Untested example:
select Name, sum((ASCII(TType) - 100) * Amount * (-1)) + sum((ASCII(TType) - 99) * Amount * (-1)))) as balance from Account a1 group by Name.
I would not recommend using this method but it is a way of achieving what you want.

Answer 3

select t.Name, sum(t.cr) - sum(t.dr) as balance from (select Name, case TType when 'c' then sum(Amount) else 0 end as cr, case TType when 'd' then sum(Amount) else 0 end as dr from Account group by Name, TType) t group by t.Name;
This will surely help you!!

Answer 4

The following worked for me on Microsoft SQL server. It has the Brought Forward balance as well
WITH tempDebitCredit AS (
Select 0 As Details_ID, null As Creation_Date, null As Reference_ID, 'Brought
Forward' As Transaction_Kind, null As Amount_Debit, null As Amount_Credit,
isNull(Sum(Amount_Debit - Amount_Credit), 0) 'diff'
From _YourTable_Name
where Account_ID = #Account_ID
And Creation_Date < #Query_Start_Date
Union All
SELECT a.Details_ID, a.Creation_Date, a.Reference_ID, a.Transaction_Kind,
a.Amount_Debit, a.Amount_Credit, a.Amount_Debit - a.Amount_Credit 'diff'
FROM _YourTable_Name a
where Account_ID = #Account_ID
And Creation_Date >= #Query_Start_Date And Creation_Date <= #Query_End_Date
)
SELECT a.Details_ID, a.Creation_Date, a.Reference_ID, a.Transaction_Kind,
a.Amount_Debit, a.Amount_Credit, SUM(b.diff) 'Balance'
FROM tempDebitCredit a, tempDebitCredit b
WHERE b.Details_ID <= a.Details_ID
GROUP BY a.Details_ID, a.Creation_Date, a.Reference_ID, a.Transaction_Kind,
a.Amount_Debit, a.Amount_Credit
Order By a.Details_ID Desc