sql - Divisor coming as null -


i have find percentage difference between 2 numbers.

i using formula a-b/(a+b/2)

i.e

select round( ( a-b)/(a+b/2)) dual;

where , b 2 numbers. if , b 0 divisor comes zero. in case can done avoid error ? percentage difference between 2 equal numbers or 0 ?


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