SQL, divide by zero erro encountered

hi experts,

I got an error message "Divide by zero error encountered."
from the query "cast(isnull(financecompare,0) as float)/cast(totallease as float)*100 as Leaseswitch". So, how could I correct it? Thank you.

This is my dataset,

select  ld.dealershipname, ld.dealerid, impressions, pencils, isnull(leasecompare,0) as Leasecompare, totallease, newtotalfinancedeals, isnull(financecompare,0) as Financecompare, soldarchived,
cast(totallease as float)/(cast(totallease as float )+cast(newtotalfinancedeals as float))*100 as Leasepercentage,
cast(isnull(financecompare,0) as float)/cast(totallease as float)*100 as Leaseswitch
from #leasingdealers ld
left join #leasecompare2 lc on ld.dealerid=lc.dealerid
left join #financecompare2 fc on fc. dealerid=lc.dealerid
left join #deals d on ld.dealerid=d.dealerid
order by ld.dealershipname asc
tanj1035Asked:
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Jim HornMicrosoft SQL Server Data DudeCommented:
Instead of this..
  numberator / denominator

Open in new window

.. use this to avoid a divide by zero error..
  CASE WHEN ISNULL(denominator,0) = 0 THEN 0 ELSE numberator / denominator END

Open in new window

So in your case
CASE WHEN ISNULL(totallease,0) + ISNULL(totalleas,0) = 0 THEN 0 ELSE cast(totallease as float)/(cast(totallease as float )+cast(newtotalfinancedeals as float))*100 END as Leasepercentage,

Open in new window

Assuming nothing funky is going on that prevents the CASE from converting to your numeric format.

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Vitor MontalvãoMSSQL Senior EngineerCommented:
By the error message the only thing that must be happening is that there's at least one record with totallease with zero value.
What you pretend to do on those cases?
tanj1035Author Commented:
Thanks for your reply, Jim, Vitor

actually, "cast(totallease as float)/(cast(totallease as float )+cast(newtotalfinancedeals as float))*100 as Leasepercentage" can return the value.
The error message refers to "cast(isnull(financecompare,0) as float)/cast(totallease as float)*100 as Leaseswitch".
Based on your recommendation, I have changed it to
"case when isnull(financecompare,0) =0 then 0 else cast(financecompare as float)/cast(totallease as float)*100 end as Leaseswitch"

It worked. Thanks
Jim HornMicrosoft SQL Server Data DudeCommented:
Thanks for the split.  Good luck with your project.  -Jim
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