How do I get SUM function in MySQL to return '0' if no values are found?

Question

Say I have a simple function in MySQL:

SELECT SUM(Column_1)
FROM Table
WHERE Column_2 = \'Test\'

If no entries in Column_2 con

Answer 1

if sum of column is 0 then display empty

select if(sum(column)>0,sum(column),'')
from table