How to add column values in mysql

Question

This is my table data Student

And this is my query --

Answer 1

Sum is a aggregate function. You dont need to use it. This is the simple query -

select *,(maths + chemistry + physics ) AS total FROM `student`

Answer 2

Try this

SELECT id, ( maths + chemistry + physics ) AS total, maths, chemistry, physics
FROM `student`

You are done. Thanks

Answer 3

You don't need use SUM for this operation. Try this query:

SELECT id, ( maths + chemistry + physics ) AS total, maths, chemistry, physics
FROM `student`

Answer 4

The sum function in MySQL works in the sense that it gives you the sum of values in a column from your select statement. If you need to sum values from a row in your query, then just use plus (+) What you need is this query :

SELECT id, (`maths` +`chemistry`+`physics`) AS `total`, `maths`, `chemistry`, `physics`
FROM `student`;

This will give you the results you need.

Answer 5

If you're requiring to get total marks of each student, then SUM is not what you'd be needing.

SELECT id,
    (maths+chemistry+physics) AS total,
    maths,
    chemistry,
    physics
FROM `student`

Will do the job just fine.

Answer 6

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`