how to find difference between rows of same column in sql

Question

question-> Write a query to display all those account number, deposit, withdrawal where withdrawal is more then deposit amount.

Answer 1

Try this(you can also do it by SELF JOIN):

;WITH D AS
(
SELECT ACNUMBER, SUM(TRANSACTION) AS Deposit
FROM TABLE_NAME 
WHERE TRANSACTION_TYPE = 'Deposit'
GROUP BY ACNUMBER
)
, W as
(
SELECT ACNUMBER, SUM(TRANSACTION) AS Withdrawal
FROM TABLE_NAME 
WHERE TRANSACTION_TYPE = 'Withdrawal'
GROUP BY ACNUMBER

)
SELECT D.ACNUMBER, d.Deposit, w.Withdrawal

FROM D 
INNER JOIN W
ON D.ACNUMBER = W.ACNUMBER
WHERE d.Deposit < w.Withdrawal

Answer 2

You should not group by transaction type. Try this

select acnumber,sum(transaction_amount * case when transaction_type = 'deposit' then 1 else -1 end) as amount 
from trandetails 
group by acnumber
order by acnumber asc 

You may be interested only in rows where the amount is negative as these are the accounts where withdrawl > deposit. In that case add a filter:

select acnumber,sum(transaction_amount * case when transaction_type = 'deposit' then 1 else -1 end) as amount 
from trandetails 
group by acnumber
having sum(transaction_amount * case when transaction_type = 'deposit' then 1 else -1 end) < 0
order by acnumber asc