group by error in divide by zero problem

Hi, below is my code along with the error message which
i am getting..i basically want to divide sum(total_spend)
by count(orders)..

  can any one please re-write my code in tsql so that
it does not return any error including divide by zero..

Many Thanks
select  case when orders = 0 then 0 else ISNULL(sum(total_spend)/count(orders),0) end as [count]
		from tmp_fov
		group by custid

error - Msg 8120, Level 16, State 1, Line 1
Column 'tmp_fov.orders' is invalid in the select list because it is not contained in either an aggregate function or the GROUP BY clause.

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gvamsimbaAsked:
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chapmandewCommented:
select  case when count(orders) = 0 then 0 else ISNULL(sum(total_spend)/count(orders),0) end as [count]
                from tmp_fov
                group by custid
0

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Aneesh RetnakaranDatabase AdministratorCommented:

select ISNULL(sum(CASE WHEN orders >0 THEN total_spend ELSE 0 END )/count(orders),0) as [count]
from tmp_fov
group by custid
0
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Microsoft SQL Server 2005

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