Sum of null columns in SQL -

i have table a, b , c allow null values.

select      a, b, c,     + b + c 'sum'  table 

if a, b , c values 10, null , null, sum column shows nothing in it.

is there way fix this, , display sum 10? other converting null s zeros?

you use sql coalesce uses value in column, or alternative value if column null

so

sum ( coalesce(a,0) + coalesce(b,0) + coalesce(c,0))