Please help me write this query or function

Hi

We have a table like follows:

id, account_name, amount, action_type

The amount field has both debit and credit entires and
action_type defines the type of transaction ( debit or
credit), debit entries have negative '-' symbol before
the amount.

where there are multipble transaction for the same id,
I need to write a query as under:

select id, amount(credit), amount(debit), amount
credit - amount debit from table where id is the same;

Its making it difficult for me because the amount
field has both debit and credit entries, your ideas,
codes or sql will be much appreciated.

Thanks
Mike

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