How to add column values in mysql

Question

This is my table data Student

And this is my query --

Answer 1

Tip: If one of the fields has the possibility to be NULL, then use COALESCE to default these to 0, otherwise total will result in NULL.

SELECT *, (
    COALESCE(maths, 0) +
    COALESCE(chemistry, 0) +
    COALESCE(physics, 0)
) AS total 
FROM `student`