How to create a select statement with a conditional

I have the following sql:
select sum(qty * unit_cost) from table1 where id=@id

I need to revise this such that if the qty value is -1, I want to make it 1 and then multiply unit_cost

Can anyone help?
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nexusnationConnect With a Mentor Commented:
What DB are you using?

If you are using Access, you can do:

elect sum(Abs(qty) * unit_cost) from table1 where id=@id

Assuming that qty will always be >= -1.
ipamanAuthor Commented:
i am using SQL Server 2005
Did it work?  I'm not sure it SQL Server 2005 has that function.
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