resolve devide by zero error

I have a procedure calling some data from a view which has the where clause to Eliminates zero values, but I still get Devide by zero error. also, can anyone provide a better syntaxt to eliminate those zero's in one query?
code attached.  I would basically like extracked a list of Items where the usage for this period have doubled what the last 2 months were and M1 is more than half of what we have.

select * from vw_spike_usages2 
group by item_id ,qty_free,M3,M2,M1
having  M1/M2+M3>=1 and M1/qty_free >=.5

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I have no idea what your expression mean but are you sure that ....
is correct and that you don't mean....
which is quite different as a mathematical expression.
tips54Author Commented:
I added the parenthesis.  Can you think of any way to address the divide by zero error?
What does this mean then?
'data from a view which has the where clause to Eliminates zero values'

or are you just testing individual field values and not removing records where m2+m3 is zero?
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Christopher GordonSenior Developer AnalystCommented:
Not sure if I followed your example, but using Nullif([fieldname],0) always resolved this issue for me.  So in your example,

M1/NULLIF((m2+m3),0) > = 1
You might try this:

FROM vw_spike_usages2
AND (M1/M2)+M3>=1 AND M1/qty_free>=.5
GROUP BY item_id, qty_free, M3,M2,M1

I am quite confident this will eliminate the divide by zero as it eliminates all of the zeroes from the query by using -1
tips54Author Commented:
the statement did not resolve the divide by zero error.
I resolved this some other way

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Query Syntax

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