prithviraj:

You'll want something like:

-- compute the totals for each account:
select AccNum, sum(DB_amt) ttl_DB_amt, sum(CR_amt) ttl_CR_amt
from (
   -- transform the table from (accnum, type, amount) into
   -- (accnum, cr_amt, db_amt)
   select accnum,
          case when type='Credit' then Amount else 0 end CR_amt,
          case when type='Debit'  then Amount else 0 end DB_amt
   from YOUR_TABLE_NAME
   where CHOOSE_WHICH_ACCOUNT(S)_YOU_WANT
)
group by AccNum
[download]

The inner select converts your table into a simpler view of account number, credit amount and debit amount. The outer select generates the totals for the simple view.

Update: For your other questions, simply make the appropriate view transformations and accumulate the totals as above.

...roboticus

When your only tool is a hammer, all problems look like your thumb.