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MySQL Query error - Divide By Zero workaround?

Thread began 4/24/2009 11:02 am by tom92909 | Last modified 6/29/2009 12:13 pm by tom92909 | 5612 views | 8 replies

tom92909Beta Tester

I took about 2 months off on this problem, and now I'm back to try and find a solution for a work around for "divide by zero" errors. I have the following that I'm working on (same as before mostly)...

SUM( Janunits + Febunits + Marunits + Aprunits + Mayunits + Jununits + Julunits + Augunits + Sepunits + Octunits + Novunits + Decunits ) AS CurrentTotal

It is possible that some of the records might have ZERO across all of the above fields.

Then I need to subtract the difference of the CurrentTotal from the PreviousTotal (previous total from the year before).

CurrentTotal - PreviousTotal = Difference

Once I have the difference amount, I then need to take that amount and divide it by the CurrentTotal and then multiply that result by 100

(Difference / CurrentTotal)*100 = PercentageDifference

Ok, so in the example above, there are a few of the rows that appear not to have had any activity over the past year. Resulting in a fatal Divide By Zero error message. Due to accounting restrictions, I can not filter out these rows, they must remain in the result set. I'm hoping for a solution to bypass the fatal error.

Any suggestions?

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