How to conditionally handle division by zero with MySQL

Question

In MySQL, this query might throw a division by zero error:

SELECT ROUND(noOfBoys / noOfGirls) AS ration
FROM student;

If noOfGirls

Answer 1

select
    case student.noOfGirls
           when 0 then 1
           else  round(noOfBoys/noOfGirls)
    end as ration
from
    `student`