Question

please someone help me to solve this issue:
I have this select:

SELECT Cast(( Isnull(price, 0) + Isnull(notarycosts, 0)
              + Isnull(landtax, 0) + Isnull(othertaxes, 0)
              + Isnull(agentfee, 0) + Isnull(cadastralfee, 0)
              + Isnull(tabulationfee, 0)
              + Isnull(certsarcini, 0) ) / ( totalareasqm / 10000 * fixhist ) AS
                   DECIMAL(12, 4)) AS EurPerHa

Sometime i’m getting a divide by zero error and my app it’s blocked until i delete the last row from the database.
Could I solve somehow this issue?

Thanks!

Answer 1

Either TotalAreaSqm or FixHist is 0. As we cannot divide by zero, what should your script do when a zero exists?

I usually see approaches of either make it NULL or use a known value to make it work. I have no idea what a safe value would be.

Make it null approach

select cast((isnull(price,0)+isnull(notarycosts,0)+isnull(landtax,0)+isnull(othertaxes,0)+isnull(agentfee,0)+isnull(cadastralfee,0)+isnull(tabulationfee,0)+isnull(certsarcini,0))/(NULLIF(TotalAreaSqm, 0)/10000*NULLIF(FixHist, 0) as decimal(12,4)) as EurPerHa